Cooling System; Back Focus Distance; Protect Window - ZWO ASI071 Series Manual

5.3 Cooling system

The ASI071 camera has 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 exposure for
each frame. However, keep in mind that cooling won't help with very short exposure 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 ASI071 sensor at various temperatures.

5.4 Back focus distance

The M42 female flange to the sensor is 17.5mm. You can reach 55mm back focus distance
with the 21mm and 16.5mm extender included in the camera package.

5.5 Protect Window

There is a protect window before the sensor of ASI071 camera.
It's an AR-AR coated BK7 glass, diameter is 42mm and 2mm thick.
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ASI071 Manual