C5 cameras look reveal the same time-proven design school of the C3
and C4 series in both outer shape and also internal construction. C5
camera head front cross-section is the same like the in the case of C3
and C4 series, although the used sensors are much larger. C5 head
thickness corresponds to the thickness of the Enhanced Cooling
versions of the earlier models. But still, C5 series feature
completely redesigned air cooling — more
powerful and also quieter than even the EC variants of the C3 and C4.
Also, the supplied AC/DC brick power adapter is more powerful and
employs more robust power plug.
Usage of large sensors required completely new design of the
telescope interface and the C5 series offers M68 × 1 threaded adapter only on the smaller
100 MPx C5 variant. Large 150 MPx version of the C5 standardizes on the
M85 × 1 thread on the tiltable adapter.
Like in the case of the C4 series, the internal filter wheel is not an
option, external filter wheels are necessary and the C5 camera are
equipped to control new EFW-5XL series of filter wheels. Huge sensors
require huge 65 × 65 mm square filters and EFW-5XL-5 is designed for
five such filters. The EFW-5XL-7 filter wheels for seven smaller
50 × 50 mm
square filters are available for 100 MPx
C5 variant with smaller sensor.
Rich software and driver support allow usage of C5 camera without
necessity to invest into any 3rd party software package thanks to
included free SIPS software package. However, ASCOM (for Windows) and
INDI (for Linux) drivers and Linux driver libraries are shipped with
the camera, provide the way to integrate C5 camera with broad variety
of camera control programs.
The C5 cameras are designed to work in cooperation with a
host Personal Computer (PC). As opposite to digital still cameras,
which are operated independently on the computer, the scientific
cooled cameras usually require computer for operation control, image
download, processing and storage etc. To operate the camera, you
need a computer which:
Is compatible with a PC standard and runs modern 32 or 64-bit
Windows operating system.
Is an x86 or ARM based computer and runs 32 or 64-bit Linux
Support for x64 based Apple Macintosh computers is also
C5 cameras are designed to be attached to host PC through very fast
USB 3.0 port. While the C5 cameras remain compatible with older (and
slower) USB 2.0 interface, image download time is significantly
Alternatively, it is possible to use the Moravian Camera
Ethernet Adapter device. This device can connect up to four Cx
(and CCD based Gx) cameras of any type (not only C5, but also C1, C2,
C3 and C4) and offers 1 Gbps and 10/100 Mbps Ethernet interface for
direct connection to the host PC. Because the PC then uses TCP/IP
protocol to communicate with the cameras, it is possible to insert
WiFi adapter or other networking device to the communication path.
Please note that the USB standard allows usage of cable no
longer than approx. 5 meters and USB 3.0 cables are even shorter to
achieve very fast transfer speeds. On the other side, the TCP/IP
communication protocol used to connect the camera over the Ethernet
adapter is routable, so the distance between camera setup and the host
PC is virtually unlimited.
Download speed is naturally significantly slower when camera is
attached over Ethernet adapter, especially when compared with direct
USB 3 connection.
The camera must be connected to some optical system (e.g. the
telescope) to capture images. As the C5 cameras offer really large
sensors with 67 mm (150 MPx version) and 55 mm
(100 MPx version) diagonals, optical
system must be capable to cover such large field of view. The camera
is designed for long exposures, necessary to acquire the light from
faint objects. If you plan to use the camera with the telescope, make
sure the whole telescope/mount setup is capable to track the target
object smoothly during long exposures.
C5 Camera Overview
C5 camera head is designed to be used with or without external
filter wheel. The EFW-5XL external filter wheel with 50 × 50 mm filters is
suitable for C5A-100M camera only, large sensor C5A-150M model
needs EFW-5XL external filter wheel, designed for 65 × 65 mm
Schematic diagram of C5 camera system
Components of C5 Camera system include:
C5 camera head
External Filter Wheel XL size
7-positions filter wheel for XL housing for
50 × 50 mm square filters
5-positions filter wheel for XL housing for
65 × 65 mm square filters
Canon EOS bayonet adapter for the XL size
External Filter Wheel with 44 mm
M68 × 1 threaded adapter,
BFD is 35 mm when
mounted directly on camera head and
47,5 mm when
mounted on EFW
M85 × 1 threaded adapter,
BFD is 31 mm when
mounted directly on camera head and
43,5 mm when
mounted on EFW
C5-OAG (Off-Axis Guider Adapter) with M85 × 1 thread for the XL size External
Filter Wheel with 61,5 mm BFD
10 mm long CS-to-1.25"
adapter, used to attach CS-mount (C-thread,
12,5 mm BFD)
compatible guider cameras to the OAG
C1 guider camera
Moravian Camera Ethernet Adapter (x86 CPU)
Moravian Camera Ethernet Adapter (ARM
CMOS Sensor and Camera Electronics
C5 cameras are equipped with Sony IMX rolling shutter
back-illuminated CMOS detectors with
3,76 × 3,76 μm square pixels. Despite the relatively small pixel
size, the full-well capacity over 50 ke- rivals the full-well
capacity of competing CMOS sensors with much greater pixels and
even exceeds the full-well capacity od CCD sensors with comparable
The used Sony sensors are equipped with 16-bit ADCs (Analog to
Digital Converters). 16-bit digitization ensures enough resolution
to completely cover the sensor exceptional dynamic range.
C5 camera models include:
||11664 × 8750
||14208 × 10656
||3,76 × 3,76 μm
||3,76 × 3,76 μm
||43,86 × 32,90 mm
||53,42 × 40,07 mm
CMOS camera electronics primary role, beside the sensor
initialization and some auxiliary functions, is to transfer
data from the CMOS detector to the host PC for storage and
processing. So, as opposite to CCD cameras, CMOS camera design
cannot influence number of important camera features, like the
dynamic range (bit-depth of the digitized pixels).
The sensors used in C5 cameras show very good linearity in
response to light. This means the camera can be used for
advanced research projects, like the photometry of variable
stars and transiting exoplanets etc.
C5 cameras are equipped with on-board RAM, capable to hold
several full-resolution frames. Downloading of the image to
the host computer thus does not influence image digitization
process, as the download only transfers already digitized
images from camera memory.
Time needed to digitize and download single full frame
depends on USB connection type.
|Full-frame, USB 3.0 (5 Gbps)
|Full-frame, USB 2.0 (480 Mbps)
If only a sub-frame is read, time needed to digitize and
download image is naturally lower. However, the download time
is not cut proportionally to number of pixels thanks to some
fixed overhead time, independent on the sub-frame
|1024 × 1024
sub-frame, USB 3.0 (5 Gbps)
|1024 × 1024
sub-frame, USB 2.0 (480 Mbps)
The driver is sometimes forced to read bigger
portions of the sensor than the user defined because of a
sub-frame position and dimension limitations imposed by the
sensor hardware. Sometimes it is even necessary to read the
It is recommended to click the Adjust Frame
button in the Frame tab of the SIPS camera control
tool. The selected frame dimensions are then adjusted
according to sensor limitations. Adjusted frame is then read
from the sensor, without a necessity to read a bigger portions
or even whole sensor and crop image in firmware.
C5 camera electronics supports in-camera 2 × 2 binning. If this binning mode is used,
download speed increases because of less amount of data read
|Full-frame 2 × 2 HW
binning, USB 3.0 (5 Gbps)
|Full-frame 2 × 2 HW
binning, USB 2.0 (480 Mbps)
Download speed when using the Moravian Camera Ethernet
Adapter depends if the 100 Mbps or 1 Gbps Ethernet is used, if
USB 2 or USB 3 is used to connect camera to Ethernet Adapter
device, but also depends on the particular network utilization
etc. When the camera is connected to the Ethernet Adapter
using USB 3 and 1 Gbps Ethernet is directly connected to the
host PC, download time of the C3-61000 full frame is approx.
Sensors used in C3 cameras offer programmable gain from 0
to 36 dB, which translates to the output signal multiplication
from 1× to 63×.
Camera driver accepts gain as a number in the range 0 to
4030, which corresponds directly to sensor register value.
This number does not represent gain in dB nor it is an exact
gain multiply. However, the driver offers a function, which
transforms the gain numerical value to gain expressed in dB as
well as multiply. Some selected values are shown in the
||Gain in dB
Conversion factors and read noise
Generally, many sensor characteristics depend on the used
gain. Also, the used sensors employ two conversion paths. One
path offers very low read noise, but cannot utilize full
sensor dynamic range. Another conversion path offers maximum
pixel capacity, but at the price of higher read noise. The
cross point is set to gain 3×
(approx. 10 dB), where the full
well capacity drops from more than 50 ke- to ~17 ke-. The read noise then drops from
~3,2 e- RMS to
~1,5 e- RMS.
||Gain in dB
||Read noise RMS
||Full well capacity
||50 000 e-
||16 500 e-
||16 500 e-
||11 200 e-
Sensor dynamic range, defined as full well capacity
divided by read noise, is greatest when using gain 0,
despite somewhat higher read noise:
At gain = 0, dynamic range is
50 000 / 3,52 = 14 205×
At gain = 2750, dynamic range is
16 500 / 1,51 = 10 927×
Also, it is worth noting that in reality the noise floor is
only rarely defined by read noise. Unless the camera is used
with very narrow narrow-band filter (with FWHM only a few nm)
and under very dark sky, the dominant source of noise is the
sky glow. When the noise generated by sky glow exceeds
approximately 4 e- RMS, extremely
low read noise associated with gain set to 2750 or more is not
utilized and dynamic range is unnecessarily limited by the
lowered full well capacity.
So, which gain settings is the best? This depends
on the particular task.
Gain set to 2750 can be utilized if imaging through
narrow-band filter with appropriately short exposures, so
the background noise does not exceed the read noise. This is
typical for aesthetic astro-photography, where the lowered
full well capacity does not negatively influence the result
But even without narrow-band filters, the
extremely low read noise allows stacking of many short
exposures without unacceptable increase of the stacked image
background noise, caused by accumulation of high read noise
of individual exposures.
Gain set to 0 offers maximum full well capacity and
the greatest sensor dynamic range, which is appreciated
mainly in research applications. Pass-bands of filters used
for photometry are relatively wide and dominant source of
noise is the sky glow.
But also for RGB images, used
for aesthetic astro-photography, higher dynamic range allows
longer exposures while the bright portions of the nebulae
and galaxies still remain under saturation limit and thus
can be properly processed.
The camera driver and user’s applications offer wide
variety of binning modes up to 4 × 4 pixels as well as all combinations of
asymmetrical binning modes 1 × 2,
1 × 3, 1 × 4, 2 × 4
etc. To allow such flexibility, binning is performed only in
the camera driver (software binning) and does not rely on the
limited capabilities of the hardware binning.
The negative side of software binning is the same download
time like in the case of full-resolution 1 × 1 mode. For typical astronomy usage, the
small fraction of second download time is irrelevant, but for
applications sensitive to download time, the hardware
2 × 2 binning can be useful.
The C5 camera implements 2 × 2 binning mode in hardware in
addition to normal 1 × 1
binning. This mode can be turned on and off using the
HWBinning parameter in the 'cXusb.ini'
configuration file, located in the same directory like the
'cXusb.dll' driver DLL file itself.
HWBinning = true
When the HWBinning parameter is set to
true, the in-camera hardware binning is used and
software binning is no longer available. This mode
brings faster download time, but also introduces several
Maximal binning is limited to 2 × 2, higher binning modes are not
Asymmetrical binning modes (1 × 2, 2 × 1, ...) are not allowed.
Adding vs. averaging pixels
The traditional meaning of pixel binning implies adding
of binned pixels. This originated in CCD sensors, where
pixel charges were literally poured together within the
sensor horizontal register and/or the output node.
For CMOS sensors with full 16-bit dynamic resolution,
the negative side of binning is limiting of the sensor
dynamic range, as for instance only 1/4 of maximum charge
in each of the 2 × 2 binned
pixels leads to saturation of resulting pixel. CCDs
eliminated this effect to some extend by increasing of the
charge capacity of the output node and also by decreasing
of the conversion factor in binned modes. But such
possibilities are not available in CMOS detectors.
In theory, the resulting S/N ratio of binned
pixel remains the same regardless if we add or average
them. Let's take for example 2 × 2 binning:
If we add 4 pixels, signal increases 4-times and
noise increases 2-times — three
additive operations increase noise by
√((√2)^2×(√2)^2 ). Resulting S/N
increases 2-times, but only until the sum of all pixels
is lower than the pixel capacity.
If we average 4 pixels, signal remains the same
but the noise is lowered to 1/2 as noise is averaged
√((√2)^2×(√2)^2 )/4. Resulting S/N
also increases 2-times, but only until the noise
decreases to lowest possible 1-bit of dynamic
As the C5 camera read noise in the maximum dynamic
range (gain 0) is around 3,5 ADU, halving
it in 2 × 2 binning mode
still keeps the read noise above the lower 1-bit limit and
at the same time binned pixel will not saturate. For
higher binning modes, the noise approaches lower limit,
but averaging pixels still protects from pixel saturation,
which is more important than possible S/N limitation
caused by underflow of read noise.
If we take into account that the image background noise
is only rarely defined by the read noise of the sensor, as
the noise caused by background sky glow is typically much
higher, for 16-bit camera averaging pixels is definitely
the better way to bin pixels compared to just adding them.
This is why both software and hardware binning modes in
the C5 cameras are by default implemented as averaging of
pixels, not summing.
However, both software and hardware binning modes can
be switched to sum binned pixels instead of average them
by the BinningSum parameter in the
'cXusb.ini' configuration file:
BinningSum = true
Let’s note there is one more possibility to bin
pixels — in the application
software. This time binning is not performed in camera
hardware nor in the camera driver. Full resolution
1 × 1 image is downloaded
from the camera and software itself then performs binning.
The SIPS software adds pixels instead of averaging them,
but at the same time SIPS converts images from 16-bit to
32-bit dynamic range. This means S/N of the binned images
always increases, pixels never saturate and read noise
newer approaches lower limit. The negative side of this
option is two-time bigger images.
Binning in photometry
Saturated pixels within bright stars are no issue for
aesthetic astro-photography, but photometry measurement is
invalid if any pixel within the measured object reaches
maximum value, because it is not possible to determine the
amount of lost flux. Software performing photometry (e.g.
the SIPS Photometry tool) should detect saturation value
and invalidate entire photometric point not to introduce
But binning efficiently obliterates the fact that any
of the binned pixels saturated (with the exception of all
binned pixels reached saturation value). So, using of
binning modes for research applications (photometry and
astrometry) can lead to errors caused by lost flux in
saturated pixels, which cannot be detected by the
processing software due to binning.
This is why the behavior of both software and hardware
binning modes is user-configurable through the
BinningSaturate parameter in the
'cXusb.ini' configuration file:
BinningSaturate = true
If the BinningSaturate parameter is set to
true, resulting binned pixel is set to saturation value if
any of the source pixels is saturated. For aesthetic
astro-photography, keeping this parameter false could
result into slightly better representation of bright star
images, but for research applications, this parameter
should always be set to true.
The shortest theoretical exposure time of the C5
cameras depends on the used sensor type:
However, such short exposures have no practical
application, especially in astronomy. The camera firmware
rounds exposure time to a multiply of 100 μs intervals, so in
reality the shortest exposure time of both camera models is
There is no theoretical limit on maximal exposure length,
but in reality, the longest exposures are limited by
saturation of the sensor either by incoming light or by dark
current (see the following chapter about sensor cooling).
Please note the short exposure timing is properly
handled in the camera firmware version 6.5 and
C5 cameras are equipped with mechanical shutter, which is
very important feature allowing unattended observations (fully
robotic or just remote setups). Without mechanical shutter, it
is not possible to automatically acquire dark frames,
necessary for proper image calibration etc.
Mechanical shutter in the C5 cameras is designed to be as
reliable as possible, number of open/close cycles is virtually
unlimited, because there are no surfaces rubbing against each
other. The price for high reliability is slow shutter motion.
Luckily, mechanical shuttering is not necessary for exposure
control, only for taking dark frames and possibly bias
frames — all used CMOS sensors are
equipped with electronic shuttering.
Camera firmware optimizes the shutter operation to avoid
unnecessary movements. If a series of light images is taken
immediately one after another, the shutter remains open not to
introduce quite significant delay of the close/open cycle
between each pair of subsequent light images. In the case next
image has to be dark or bias frame, shutter closes prior to
dark frame exposure and vice versa — shutter remains closed if a series of dark
frames is acquired and opens only prior to next light frame.
If no exposure is taken for approx. 10 seconds while the shutter is open (this
means after a light image exposure), camera firmware closes
the shutter to cover the sensor from incoming light.
Cooling and power supply
Regulated thermoelectric cooling is capable to cool the CMOS
sensor up to 45 °C below ambient temperature. The Peltier hot side
is cooled by fans. The sensor temperature is regulated with
±0.1 °C precision. High temperature drop and precision regulation
ensure very low dark current for long exposures and allow proper
The C5 camera air intake is located on the top side of
the camera head; hot air output vents are on the camera back
The cooling performance depends on the environmental conditions
and also on the power supply. If the power supply voltage drops
below 12 V, the maximum temperature
drop is lower.
||Thermoelectric (Peltier modules)
||45 °C below ambient regulated
||48 °C below ambient maximum
|Hot side cooling
||Forced air flow
Chip cooling specifications
C5A-100M cameras reaching -45°C below ambient sensor
The 12 V DC power supply enables camera operation
from arbitrary power source including batteries, wall adapters
etc. Universal 100-240 V
AC/50-60 Hz, 120 W brick adapter is supplied with
the camera. Although the camera power consumption does not
exceed 60 W, the 120 W power supply ensures noise-free
|Camera power supply
||12 V DC
|Camera power consumption
||<9 W without cooling
||60 W maximum cooling
|Adapter input voltage
||100-240 V AC/50-60 Hz
|Adapter output voltage
||12 V DC/10 A
|Adapter maximum power
Power supply specification
12 V DC/10 A power supply adapter for C5
Compact and robust camera head measures only 154 × 154 × 76 mm (approx.
6 × 6 × 3 inches).
The head is CNC-machined from high-quality aluminum and black
anodized. The head itself contains USB-B (device) connector and
4-pin 12 V DC power plug, no other parts, except a
brick power supply, are necessary. Another connector on
the camera head allows control of optional external filter wheel.
Integrated mechanical shutter allows automatic dark frame
exposures, which are necessary for unattended, robotic setups.
|Internal mechanical shutter
||Yes, blade shutter
|Camera head dimensions
||154 mm × 154 mm × 76 mm
|Camera head weight
(without filter wheel)
(with the XL external filter wheel)
Camera head front view
C5 camera head interface for filter wheel or
tiltable adapter base
Filter wheels or tiltable adapter base are attached to the
camera head using six M3 screws around the 70 mm diameter ring.
Camera with M85 × 1 threaded
C5 camera head with M85 × 1 adapter front view
C5 camera head with M85 × 1 adapter side view with back focal
C5 camera with External Filter wheel with
M85 × 1 adapter Back Focal
The stated back focal distances (BFD) include corrections
for all optical elements in the light path (cold chamber
optical window, sensor cover glass, ...), fixed in the camera
body. So, stated values are not mechanical, but optical back
focal distances. However, no corrections for filters are
included, as the thicknesses of various filters are very
Note the M85 × 1 adapter
is also equipped with eight M3 threaded holes arranged around
the 91 mm diameter circle. These
threaded holes provide alternative mean of camera attachment
to the optical system.
Camera with M68 × 1 threaded
C5 camera head with M68 × 1 adapter front view
C5 camera head with M68 × 1 adapter side view with back focal
C5 camera with External Filter wheel with
M68 × 1 adapter Back Focal
Camera with C5-OAG with M85 × 1 thread
C5-OAG is designed to be used with the XL-sized External
filter wheels only.
C5 camera with External Filter wheel with
C5 camera with External Filter wheel with C5-OAG
Back Focal Distance
Filter distance to sensor
It is necessary to know the distance of the filter entrance
aperture from the sensor to calculate possible vignetting
(partial shielding of the sensor edge parts from the incoming
lights). In the case of C5 cameras, this is technically not an
aperture, as the filters are squares. So, instead of
comparing filter aperture diameter to sensor diagonal, filter
hole linear dimension must be compared longer side of the
Distance of the filter wheel entrance pupil from
The 7-positions filter wheel for 50 × 50 mm filters entrance dimension is
48 mm, 5-positions filter wheel
for 65 × 65 mm filters entrance
dimension is 63 mm. The C5A-100M
sensor longer side measures 43,86 mm, while the C5A-150M sensor longer side
measures 53,42 mm.
Various accessories are offered with C5 cameras to enhance
functionality and help camera integration into imaging setups.
External filter wheels
The C5 camera contains electronics and an 8-pin connector
on the camera head to control filter wheels. As the mechanical
interface of the C5 cameras, intended to attach filter wheels,
differs from the interface on the C3 or C4 cameras (see the
chapter Camera head front view of the Mechanical Specification
section for details), C5 cameras are not compatible with the
M or L external filter wheels intended for
C3 or C4 lines. New XL size external filter wheel is
designed especially for the C5 series.
C5 camera with the XL filter wheel
The ”XL” filter wheel housing can accommodate two
There are basically only two types of telescope
adapters, available for C5 cameras:
M85 × 1 threaded
adapter, intended for both C5A-100M and C5A-150M camera
models. This adapter is also equipped with eight M3 threaded
holes arranged around the 91 mm
diameter circle, providing alternative possibility to attach
the C5 camera to the optical system.
M68 × 1 threaded
adapter, suitable for C5A-100M camera only due to limited
aperture, possibly causing vignetting of the large sensor of
Both adapters have adjustable tilt and both can be mounted
either on the adapter base on the camera head or on the
External filter wheel front plane.
Off-Axis Guider adapter
C5 camera can be optionally equipped with Off-Axis Guider
Adapter. This adapter contains flat mirror, tilted by 45° to
the optical axis. This mirror reflects part of the incoming
light into guider camera port. The mirror is located far
enough from the optical axis not to block light coming to the
main camera sensor, so the optics must be capable to create
large enough field of view to illuminate the tilted
Position of the OAG reflection mirror relative to
The C5-OAG offers the M85 × 1
thread on the telescope side. The back focal distance is
The C5-OAG is designed for cameras using the XL-size
external filter wheel. The guiding camera will not be able to
reach focus is the OAG is mounted directly to the camera
C5-OAG adapter (left), OAG on then C5 camera with
External filter wheel (right)
OAG guider port is compatible with C0 and C1 cameras. It is
necessary to replace the CS/1,25” adapter
with short, 10 mm variant.
Because C1 cameras follow CS-mount standard, (BFD
12,5 mm), any
camera following this standard with 10 mm long 1,25” adapter
should work properly with the C5-OAG.
GPS receiver module
The C5 cameras can be equipped with an optional GPS
receiver module, which allows very precise timing of the
exposure times. Geographic location data are also available to
the control software through specific commands.
There are three variants of available
GPS module with integrated antenna, compatible with
GPS and GLONASS satellites.
GPS module with external antenna, compatible with GPS
and GLONASS satellites.
GPS module with external antenna, compatible with
GPS, GLONASS, Galileo and BeiDou satellites.
All variants are located on the back side of the camera
head, between the power and USB connectors. If the camera is
not equipped with the GPS module, the GPS port is covered with
a flat black cap.
GPS receiver module with integrated antenna
The module cover is made from orange plastic to
indicate the presence of RF antenna, which needs
unobstructed view of the sky to successfully acquire
signal from GPS satellites.
If the camera is located in the observatory dome,
especially if the dome is covered by copper or other
metallic sheets, GPS receiver may not be able to capture
signal from GPS satellites. Also, if the camera is located
on the telescope back side, so the camera back side points
mostly to the ground, GPS signal reception can be
The GPS receiver with integrated antenna also can be
unable to capture signal from enough satellites when the
USB3 connection is used. Please note this issue is not
specific to the C5 camera, but it affects any GPS receiver
or other RF devices, operating in a close proximity to a
USB3 line. Using of USB2 cable solves this problem, but at
the expense of slower image download. If the USB3
connection is used, usage of the GPS module with external
antenna may be necessary.
C5 camera without (left) and with GPS module
with integrated antenna (right)
GPS receiver module with external antenna
The variant of GPS module with external antenna is
attached to the camera head the same way like the previous
variant. The module cover is black as it does not need any
special handling. The cover is thinner, but there is a
connector for the GPS antenna on it. Note the module can
work only if the antenna is connected.
GPS antenna is shipped with this variant of the GPS
module. Antenna cable is 3 m
long and the antenna is equipped with a magnet, allowing
it to be attached to any ferromagnetic surface.
The C5A camera with GPS receiver module with
GPS receiver module handling
Please note if the GPS module is to be added later, the
camera must be sent to manufacturer. Just connecting the
GPS module to available port is not enough, it is also
necessary to reconfigure the camera firmware.
GPS module is handled through camera command set. Its
main purpose is to provide very precise timing of the
exposure times with μs precision (the GPS module
provides time pulses with 30 ns tolerance). Geographic
location data are also available to the control software
through specific commands.
The GPS module needs to locate at last 5 satellites to
provide exposure timing information. Geographic data are
available if only 3 satellites are visible, but especially
the mean sea level precision suffers if less than 4
satellites are used.
Spare desiccant containers
The C3 cameras are supplied with silicagel container,
intended to dry the sensor cold chamber. This container can be
unscrewed and desiccant inside can be dried in the oven (see
the camera User's Manual).
The whole desiccant container can be baked to dry
the silica-gel inside or its content can be poured out after
unscrewing the perforated internal cap and baked
Container shipped with the camera by default does not
exceed the camera head outline. It is equipped with a slot for
tool (or for just a coin), allowing releasing and also
tightening of the container. Containers intended for enhanced
cooling cameras are prolonged as the camera thickness is
greater in the case of this variant.
It is possible to order spare container, which makes
desiccant replacement easier and faster. It is possible to dry
the spare container with silicagel and then only to replace it
on the camera. Spare container is supplied including the
Spare container can be supplied also in a variant that
allows manipulation without tools. But this container is
longer and exceeds camera outline. If the space behind the
camera is not critical, this container can make desiccant
exchange even easier.
Optional cap, standard and tool-less container
Moravian Camera Ethernet Adapter
The Moravian Camera Ethernet Adapter allows connection of
up to 4 Cx cameras of any type on the one side and 1 Gbps
Ethernet on the other side. This adapter allows access to
connected Cx cameras using routable TCP/IP protocol over
practically unlimited distance.
The Moravian Camera Ethernet Adapter device (left)
and adapter with two connected cameras (right)
Moravian Camera Ethernet Adapter devices are described in
Powerful SIPS (Scientific Image Processing System)
software, supplied with the camera, allows complete camera control
(exposures, cooling, filter selection etc.). Also automatic
sequences of images with different filters, different binning etc.
are supported. With full ASCOM standard support, SIPS can be also
used to control other observatory equipment. Specifically the
telescope mounts, but also other devices (focusers, dome or roof
controllers, GPS receivers etc.).
SIPS also supports automatic guiding, including image
dithering. Both autoguider port hardware interface
(6-wire cable) and mount Pulse-Guide API guiding methods
are supported. For hi-quality mounts, capable to track without the
necessity to guide at last during one exposure, inter-image
guiding using the main camera only is available.
SIPS controlling whole observatory (shown in optional
But SIPS is capable to do much more than just camera and
observatory control. Many tools for image calibration, 16 and
32 bit FITS file handling, image set
processing (e.g. median combine), image transformation, image
export etc. are available.
SIPS handles FITS files, supports image calibration and
As the first S in the abbreviation SIPS means
Scientific, the software supports astrometric image reduction as
well as photometric processing of image series.
SIPS focuses to advanced astrometric and photometric
image reduction, but also provides some very basic
SIPS software package is freely available for download from this www site. All functions are
thoroughly described in the SIPS User's Manual, installed with
every copy of the software.
Drivers for ASCOM standard as well as native drivers for
third-party software are also available (e.g. TheSkyX, MaxIm DL,
AstroArt, etc.). Visit the download page of this web site for current list
of available drivers, please.
Also INDI drivers for 32 bit and
64 bit Linux running on x86 and ARM
are available. Also drivers for TheSkyX package running on macOS
are supplied with the camera.
Make sure to always use the latest versions of
available software and drivers. Minimal versions or the
respective software packages, supporting the C5 cameras,
SIPS version 3.33
Moravian Camera Ethernet Adapter firmware version
ASCOM drivers version 5.13
INDI drivers in Linux version 1.9-2
Linux libraries version 0.7.1
macOS libraries version 0.6.1
TheSkyX drivers version 3.5
AstroArt drivers version 4.3
SIPS software package allows automatic guiding of the
astronomical telescope mounts using separate guiding camera.
Proper and reliable automatic guiding utilizing the
computational power of Personal Computer (e.g. calculation of
star centroid allows guiding with sub-pixel precision) is not
simple task. Guiding complexity corresponds to number of
parameters, which must be entered (or automatically
The SIPS Guider tool window
The Guiding tool allows switching of autoguiding
on and off, starting of the automatic calibration procedure
and recalculation of autoguiding parameters when the telescope
changes declination without the necessity of new calibration.
Also swapping of the German Equatorial mount no longer
requires new autoguider calibration. There is also a graph
showing time history of guide star offsets from reference
position in both axes. The length of graph history as well as
the graph range can be freely defined, so the graph can be
adjusted according to particular mount errors and periodic
error period length. Complete log of calibration procedure,
detected offsets, correction pulses etc. is also shown in this
tool. The log can by anytime saved to log file.
An alternative to classic autoguiding is the inter-image
guiding, designed for modern mounts, which are precise enough
to keep tracking with sub-pixel precision through the single
exposure, and irregularities only appear on the
multiple-exposure time-span. Inter-image guiding then performs
slight mount position fixes between individual exposures of
the main camera, which eliminates traveling of the
observed objects through the detector area during observing
session. This guiding method uses main imaging camera, it does
not use another guiding camera and naturally does not need
neither OAG nor separate guiding telescope to feed the light
Inter-image guiding controls in the
Guiding tab of the Imager Camera tool
Shipping and Packaging
C5 cameras are supplied in the foam-filled, hard
carrying case containing:
Camera body with a user-chosen telescope
A 100-240 V AC input, 12 V DC output
brick adapter with 1 m
long power cable.
2 m long USB 3.0 A-B cable
for connecting camera to host PC.
USB Flash Drive with camera drivers, SIPS software
package with electronic documentation and PDF version of
A printed copy of camera User's Manual
Example images captured with C5 cameras.
||M7 star cluster
||L, R, G, B
||66, 40, 40, 40 min
||ASA H400, 400 mm
||M42 Orion nebula
||R, G, B
||45 min (15 min per color)
||ASA H400, 400 mm
||NGC3372 Carina nebula
||R, G, B
||45 min (15 min per color)
||ASA H400, 400 mm