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Main page  Products  CCD & CMOS cameras  Articles

Articles (1/2)« 1 2 »
Gx cameras articles
New C1 series of CMOS guiding, Moon/planetary and entry-level deep-sky cameras
 Moravian Instruments introduces new line of small and affordable cameras intended for automatic guiding, but also for Moon and planetary imaging. Higher models of C1 line of cameras are also suited for entry-level imaging of deep-sky objects and due to very linear response to light, even basic research projects in photometry and/or astrometry can use C1 cameras. Very fast download through USB3 interface, high sensitivity and low read noise of the used CMOS sensors help to achieve good results in a short time. (more...)
Back Focal Distance of Gx Mark II cameras
 Gx Mark II cameras are available in many variants — individual G2, G3 and G4 series offer camera integration with internal or external filter wheels, Off-Axis Guider adapters, various threaded adapters as well as standard Canon EOS and Nikon lens bayonet adapters etc. One of the distinguishing feature of Mark II cameras is the telescope/lens adapter interface allowing precise adjustment of optical axis (sensor tilt). Despite the vast variability and many options, the Gx Mark II camera system was designed to maintain adapter-specified back focal distance of adjustable adapters on all camera variants. (more...)
Gx Cameras Mark II
 Gx series of cooled astronomical cameras evolved through many revisions, each bringing improvements, new features or just more aesthetic design. We are proud these cameras are now used to capture state-of-the-art astrophotographs (just see our Gallery section) as well as to acquire professional-grade research data. Now we introduce redesigned cameras with important enhancements, so they deserve denotation Mark II. (more...)
Interfacing G3 and G4 cameras with 3" coma-correctors
 Fast Newtonian telescopes provide excellent price/performace ratio. They offer greatest aperture for the money, because their optical design if very simple, elegant and efficient. When a Newtonian telescope is build from high quality component (Pyrex mirrors, carbon tube, robust mirror holders and focuser, ...), they are hard to beat by any other optical design. The only problem remains — parabolic mirror creates perfect image on the optical axis only, aberration called coma distorts the image as the field of view increases. Fortunately advanced refracting correctors eliminate this aberration and help to make Newtonian the perfect wide-field instrument. (more...)
Dovetail mount adapter for Gx cameras
 While the Gx cameras are firmly attached to the telescope focuser in most cases, sometimes they are used with photographic lenses, which lack any means for attachment to the telescope mount. While the G2 camera body offers standard “tripod thread”, larger G3 and G4 models did not allow for such threaded hole due to internal arrangement of CCD cold chamber. But we slightly redesigned the G3 and G4 front shell as a response to request from our users and introduced two standard 1/4" threaded holes close to the edges of the camera top side. These holes can be used to attach new 1.75" dovetail adapter (Vixen standard) for safe attachment of camera head to almost any telescope mount. (more...)
Gx CCD cameras now available with a slight touch of color
 It is always encouraging when we realize that our users love their Gx cameras, that they are not only satisfied with their state-of-the-art performance and functionality, but they also appreciate the industrial design and manufacturing quality. Still, many users, in particular among the amateur astronomer's community, appreciate also the aesthetics of their equipment — color anodized parts of mounts, telescopes or focusers are good examples. Despite the camera head dimensions and shape are constrained by its features, we always took care to achieve the clean and functional design. Now we decided to offer variants of our G2, G3, and G4 cameras with a slight color touch to allow users to unify the camera appearance with the rest of their setup. (more...)
8-positions XS external filter wheel for G2 cameras
 The smallest XS variant of the external filter wheel for G2 cameras offers 7 positions for unmounted D36 mm filters. Because filters are further from the sensor in the case of external filter wheel compared to internal filter wheel, greater filter diameter allows usage of the G2-8300 camera with largest sensor within G2 series to be used with fast optics without vignetting. But other models of the G2 series contain smaller sensors and they can work D31 mm filters. A possibility to build a new variant of the XS external filter wheel for D31 mm filters occurred. Smaller filter diameter allows increasing of the number of filter positions from 7 to 8, despite the external filter wheel dimensions remain unchanged.. (more...)
Connect the Gx Camera through WiFi network
 The Gx Camera Ethernet Adapter allows connection of up to four Gx cameras of any type over an Ethernet. Because the communication is handled over the TCP/IP network, the distance between camera and the host PC is virtually unlimited. The Ethernet port of the adapter device can be attached to arbitrary WiFi bridge device to access attached cameras wirelessly. However, such solution needs another box (the Ethernet/WiFi bridge device) with another power supply etc. This is why the Gx Camera Ethernet Adapter firmware was extended with support for USB/WiFi interfaces. (more...)
New “XS” External Filter Wheel with 7 Positions for G2 Cameras
 While answers to many questions cannot be universally true, as it depends on who you ask, the answer to question “What is the optimal number of filter wheel positions?” is 7 for vast majority of users. Astrophotographers need Red, Green and Blue filters for true-color photography and narrow-band Hα, OIII and SII filters, plus one position for clear or luminance filter. Researchers could live with 6 positions for NUBVRI filters, but one spare position, which could be left clear, is often useful. (more...)
New G4 camera adapter for ASA Wynne coma-corrector
 No optical setup is capable to cover really wide field of view without refracting correction elements. Even the best and most expensive APO refractors and RC reflectors need field-flatteners if a 50 mm diameter field has to be utilized. With a little exaggeration, spending money for premium optics, which must be corrected either way, is not necessary when much cheaper optics with a quality corrector provide the same results. And in reality well corrected Newtonian reflectors proved to be the best wide-filed, large-diameter telescopes available to amateurs. The trick is in the refracting correction element just in front of the camera, which eliminates the so-called “coma” aberration, inherent to simple parabolic mirrors. And the 3" Wynne coma correctors belong among the best available. (more...)
New design of the Gx camera desiccant container
 CCD dark current halves with every ~6°C, so keeping the CCD sensor at low temperatures is a key feature of scientific CCD cameras, allowing long exposures not ruined by excessive dark current. The CCD cooling can achieve up to 50°C below the ambient temperature, which leads to below-freezing temperatures of the sensor in all cases. This is why it is crucially important to place the cooled detector in the hermetically sealed chamber else it would be covered by the water ice within minutes. And the chamber must be dried by a desiccant, because even the residual humidity in the air is enough to create frozen ice patterns on the sensor, harming the images. New design of the desiccant containers of the Gx cameras allows more comfortable desiccant exchange and easier desiccant regeneration. Also a new variant of the container was introduced, designed to allow tool-less container replacement. (more...)
Meet the new G3-16200 camera (UPDATED)
 We are proud our company could provide feedback when OnSemi designed the new KAF-16200 CCD sensor. What is so special about this CCD? Simply put, it is designed to be the best possible sensor for vast majority of astrophotographers and astro-imaging enthusiasts around the world. While there are even greater detectors available, like KAF-16803 in the G4-16000 camera, such huge sensors require at last 3" focusers and field correctors to cover them with good quality image. As opposite, KAF-16200 in the newly introduced G3-16200 camera fits within the field of view of typical 2" focusers and optical correctors, used on absolute majority of amateur scopes. And at the same time it leaves almost no field of view area uncovered, so it allows capturing of really stunning wide field images. In association with great 16MPx resolution and 6μm pixels, low read noise and dark current, above average sensitivity and especially uniform and clean field of view, G3-16200 is an ultimate imaging camera for majority of amateur telescopes. (more...)
Enhanced cooling models of G3 and G4 cameras
 Dark current, injecting electrons into CCD pixels regardless if the sensor is illuminated or not, is the most important source of the unwanted signal. As the dark current is caused by random processes, it exponentially depends of the sensor temperature — typically the dark current is halved with temperature drop by every 5 or 7 degrees Celsius, depending on the particular sensor. While dark current can be to some extend removed from images during calibration (subtraction of the so-called “dark frame”), the random portion of the signal always remains in the image. This is why the CCD sensors in cameras intended for very low light imaging (and thus allowing for many minutes long exposures) are always cooled. Despite the inherent dark current of the OnSemi detectors, used in the Gx series of CCD cameras, is relatively small, sometimes the camera is used in hot environments and more effective cooling is required to lower the dark current. (more...)
New M48 × 0.75 adapter for Gx cameras preserving 55 mm back focal distance
 Adapter complying to the newly emerging de-facto standard of the M48 × 0.75 thread, but preserving the 55 mm distance to focal plane similarly to M42 × 0.75 based T-thread, is available for G2 and G3 cameras. (more...)
G2-0402, G2-1600, G2-3200, G2-8300, G2-2000 and G2-4000 CCD Cameras
 G2 series of small format CCD cameras uses high sensitive, low noise OnSemi Full-Frame and Interline-Transfer CCD detectors. While high-speed USB 2.0 interface allows plug-and-play operation and ensures download time within a few seconds, optional Ethernet interface provides camera connection to practically unlimited distance. Advanced analog electronics ensures uniform frames without artifacts and very low read noise. Efficient, regulated two-stage Peltier cooling keeps detectors frozen to minimize dark current. Compact and robust camera head integrates all electronics, mechanical shutter and optional internal filter wheel. Various threaded and bayonet adapters enable attaching of the camera to almost any optical system and numerous accessories like autoguiding cameras, off-axis guider adapters, external filter wheel etc. allow tailoring of the imaging system to almost every application. (more...)
Ramping production of the new revisions of cooled CCD cameras
 All technical products undergo incremental refinements and numerous innovations affected also the cooled CCD cameras of the Gx series. Changes are only subtle from the outside point of view, despite a small facelift of the G2 camera head. Updates of the internal design are more significant, but key features like extremely low read noise, efficient cooling etc., which position Gx cameras on top among similar products, are of course remained. (more...)
G1-0301: new autoguider with large detector, big pixels and high sensitivity
 New autoguiding camera G1-0301 has the same resolution like the G1-0300 model, but it has bigger pixels and thus also bigger CCD detector. Greater detector area (6.5 × 4.9 mm compared to 4.9 × 3.7 mm) and especially 80% larger pixel area bring proportionally higher sensitivity compared to G1-0300. This is why G1-0301 can be used with guiding telescopes with long focal length and also with Off-Axis Guider adapters. (more...)
Gx CCD cameras reviewed
 Several reviews of Gx CCD cameras appeared in both printed and online publications. The printed review of G2-8300 was published in the British Astronomy Now magazine, online site cloudynights.com published review of G4-16000 and external filter wheel. You can check them for yourselves. (more...)
What is Residual Bulk Image and how to deal with it
 Front-Illuminated Full-Frame CCD detectors suffer from kind of “visual memory effect”. Bright parts of the previously acquired image are visible as weak and blurred image on the following exposures, even if they are dark frames, taken with a shutter closed. This effect is called Residual Bulk Image (RBI) and it can harm long exposures, create false images of nebulae or traces of bright stars. It is possible to deal with RBI if we understand mechanisms behind this effect—we can adopt the observing program or it is possible to eliminate RBI by leveling the conditions within CCD using the near infra-red light flood before every exposure (IR preflash). (more...)
G1-1200 autoguider and planetary camera—high sensitivity meets low cost
 The G1 series of CCD cameras was extended with a new model G1-1200. The Sony ICX445 CCD detector, used in this camera, is produced using EXview HAD technology and offers high quantum efficiency, comparable to cameras employing much more expensive ICX285 CCD. The 1/3" detector format (4.9 × 3.6 mm) as well as small pixels (3.75 × 3.75 μm) suit to short focal length guiding telescopes. G1-1200 is also good for capturing Moon and planets. (more...)
Off-Axis Guider adapter for G2 CCD cameras
 Guiding of telescope mount is a necessity for really long exposures even if a high-quality mount is used and mass produced “cheap” mounts require guiding even for short exposures. Guiding camera repeatedly images a selected star or a star pattern. Computer calculates differences in measured position and performs slight corrections to the mount to compensate for mechanical irregularities and other factors, e.g. refraction. Guiding camera can be attached to separate guiding telescope or off-axis guider can be used to feed the guiding camera with the light gathered by the main telescope, used for imaging. If the guider camera uses the same optics as the main imaging camera, it is crucially important to divert the light for it before the light reaches the filters. Numerous filter has so low light transmission (e.g. photometric B or UV filters, narrow-band filters etc.), that they effectively disable guiding with the exception of a very few very bright stars. (more...)
Large format G4-9000 and G4-16000 cooled CCD cameras
 Cooled CCD cameras of G4 series contain detectors with 36 × 36 mm area, which is 50% more than photographic “full-frame” format. G4 camera dimensions are the same like dimensions of G3 series, with the exception of camera head thickness—G4 cameras are somewhat slimmer, because they do not contain internal filter wheel. Also camera handling, software control, power supply and connection to the host PC using fast USB 2.0 interface is the same like in the case of G3 cameras. Filter wheel for 50 × 50 mm square filters (round filters of 50 mm diameter cause vignetting on such large CCD chips) cannot be placed inside the camera head due to limited space. But it is possible to connect external filter wheel for 5 large filters to the G4 camera, the camera head already contains connector for external filter wheel control. (more...)
Back focal distances of Gx cameras
 Gx CCD cameras are available in many variants. There are small guiding and planetary G0 and G1 cameras, cooled G2 series, large format G3 and G4 series. G2, G3 and G4 cameras are provided without filter wheel and with internal or external filter wheel. These variants have different mechanical dimensions and naturally offer different back focal distance. (more...)
Large format G4-9000 and G4-16000 cooled CCD cameras
 Cooled CCD cameras of G4 series contain detectors with 36 × 36 mm area, which is 50% more than photographic “full-frame” format. G4 camera dimensions are the same like dimensions of G3 series. Also camera handling, software control, power supply and connection to the host PC using fast USB 2.0 interface is the same like in the case of G3 cameras. Filter wheel for 50 × 50 mm square filters (round filters of 50 mm diameter cause vignetting on such large CCD chips) cannot be placed inside the camera head due to limited space. But it is possible to connect external filter wheels for 5 or 7 large filters to the G4 camera, the camera head already contains connector for external filter wheel control. (more...)
New adapter for Canon EOS bayonet capable to hold DSLR Clip-filters
 Usage of various filters in combination with color detectors of digital single-lens reflex cameras (DSLRs) is often limited to filters suppressing light pollution. Still, there are various filters intended for placing directly inside the DSLR camera bodies, called clip-filters. These filters are fixed on place using flexuous parts of their thin cells. Moravian Instruments newly introduce a variant of Canon EOS bayonet adapter, capable to hold these clip-filters. (more...)
G1 CCD cameras can use all telescope/lens adapters designed for large G2 and G3 cameras
 G1 CCD camera body is equipped with C-mount threaded adapter. 1.25 inch barrel adapter can be threaded into C-mount, so the G1 camera can be used in all telescope focusers, capable to hold standard 1.25 inch eyepiece. But many other standards are used, for instance Canon EOS and Nikon F bayonets, T-threads, Pentax/Praktica M42 × 1 thread lens etc. Large G2 and G3 cameras can support all these standards using appropriate adapter. All these adapters can now be attached also to G1 camera equipped with newly designed interface part, which provides G2-like mounting surface on G1 camera. (more...)
G2-8300 CCD Camera
 New model G2-8300 was added to the G2 series of cooled CCD cameras for low-light imaging applications. The KAF8300 CCD detector, used in the new camera, corresponds to the so-called “4/3 standard” and its imaging area 18.1 × 13.7 mm is the largest of all detectors used in the G2 series. High resolution (more than 8 MPx) and relatively small pixels (5,4 × 5,4 μm) makes this camera ideal for use with short focal length telescopes (or with ordinary photographic lenses). This camera is also ideal for high-resolution imaging of microscopic samples. (more...)
New G3 CCD camera adapter for large TeleVue Paracorr PSB-1100
 T-thread (M42 × 0.75) adapter or M42 × 1 adapter cause vignetting when used with G3-11000. Also common coma correctors (often equipped with T-thread) cause vignetting with this large chip. TeleVue Paracorr PSB-1100 with appropriate adapter must be used with KAI-11000 CCD. (more...)
G3-11000, G3-16200, G3-1000 and G3-6300 CCD Cameras
 Large format CCD cameras of the G3 series are designed for up to 24x36 mm (photographic “full-frame” format) CCD detectors. G3 series inherits from G2 cameras — camera handling, software control, power supply and connection to the host PC using fast USB interface is the same. Design of both series is very similar and although G3 camera head is naturally bigger, it contains all mechanics and electronics and offers only power and USB connectors. As like in the case of G2 cameras, G3 head contains mechanical shutter and integrated filter wheel for five 2-inch filters. Read noise is also limited only by CCD itself so G3 series surpasses competing products. Precisely regulated cooling achieves detector temperatures up to 50 °C below ambient temperature. (more...)
G1-1400: powerful entry-level imaging camera and ultimate autoguider
 The G1 series of CCD cameras was extended with a new model G1-1400. Although this model does not offer greatest resolution among G1 cameras (G1-2000 has almost a half more pixels), thanks to bigger pixels the used CCD detector offers the greatest light-collecting area. Also important is the highest quantum efficiency compared to other G1 cameras, especially in red and near-infrared portion of the spectrum. G1-1400 can be used as high-quality entry-level camera for beginner astrophotographers and then can work as excellent automatic guider with exceptionally big detector and very high sensitivity. (more...)

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