Cooling System; Back Focus Distance - ZWO ASI294MC User Manual

6.3 Cooling system

The ASI294 Pro camera have a robust, regulated cooling system, which means that the
camera sensor can be kept at the desired temperature throughout your imaging session. The super
low readout noise, combined with efficient cooling and adjustable gain setting, allows you to do
short or lucky DSO imaging unlike the traditional CCD cameras which need very long exposures
for each frame. However, keep in mind that cooling won't help with very short exposures such as
less than 100ms. The lowest temperature that can be set is -35℃~-40℃ below ambient.
Here is a dark current test result of 294Pro sensor at various temperatures.

6.4 Back focus distance

When 11mm T2 Extender is removed from camera, back focus length is reduced to 6.5mm.
ASI294 Manual
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