The Sony IMX411 and IMX461 sensors with 150 MPx and 100 MPx
resolution, used in both asymmetrical C5A and symmetrical C5S cameras,
represent the state-of-the-art in visible-light detection technology.
The 3.76 μm pixels offer exceptional full-well capacity
exceeding 50 ke- (relative to
the pixel area). The absolute quantum efficiency approaches 90% thanks
to back-illuminated design. Very low dark current is
ensured by the advanced power saving features. These sensors also
offer full 16 bit digitization,
perfectly linear response to light and exceptionally low
read noise. All these features make the C5 cameras the ultimate
choice for both astronomical research as well as aesthetic
The main purpose of the symmetrical C5S variant design is not to
exceed the central obstruction of reflecting telescopes with the
camera located in the primary focus. The asymmetrical variant
typically overhang the central obstruction of smaller telescopes (with
~0.4 m primary mirror
diameter), despite the central obstruction of wide-field telescope is
rather big. Telescopes with greater primary mirror
(~0.6 m and more)
typically have a central obstruction big enough to accommodate even
the asymmetrical C5A cameras.
Both C5A and C5S camera lines are compatible with the XL-sized
external filter wheel. However, if the filter wheel is used, the
symmetrical design of the C5S is not beneficial at all. The front
cross-section of the asymmetrical C5A with filter wheel is smaller
than is the case of the symmetrical C5S and the filter wheel.
As is the case of the C5A cameras, also the C5S can be equipped
with GPS receiver module, ensuring exposure timing with
sub-microsecond precision. However, all symmetrical C5S cameras also
offer a hardware trigger input, similar to C1× cameras. This input allows to starting of
exposure by the external hardware, used for instance to synchronize
exposures from multiple cameras etc.
For more details about the C5 camera line, visit the C5
camera product page.