Ddr Buffer; Cooling System; Back Focus Distance; Protect Window - ZWO ASI294 Series Manual

ASI294 Manual

5.3 DDR Buffer

ASI294 Pro camera includes a 256MB(2Gb) DDR3 memory buffer to help improve data transfer
reliability. Additionally, the use of a memory buffer minimizes amp-glow, which is caused by the
slow transfer speeds when the camera is used with a USB 2.0 port.

5.4 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 ASI294 Pro sensor at various temperatures.

5.5 Back focus distance

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

5.6 Protect Window

There is a protective window in front of the ASI294 camera sensor, with 32mm diameter and 2mm
thickness.
ASI294 uses the AR coated filter.
12