Recommended gain settings for Altair Astronomy Cameras:

General considerations:
Camera set to RAW/MONO mode at highest available bit depth.
“Ultra Low Noise” may be switched on if available.
Exposures of 15secs or longer.
Note: SharpCap automatically selects most efficient settings*.

Altair Camera Model:	Sensor:	Gain in SharpCap: *	Gain other Software:	Black Level:	Bit Depth:
AA61CFX / MFX	IMX455	300	100, HCG	100	16
AA24CFX	IMX410	520	100, HCG	50	14
AA26CTEC  / AA26MTEC	IMX571	300	100, HCG	100	16
ALTAIR585C / AA585CTEC / AA585MTEC	IMX585	1365	150, HCG	500	12
AA533CTEC / AA533MTEC	IMX533	300	100, HCG	50	14
AA294C / AA294CTEC / AA294MTEC	IMX294	900	200, HCG	50	14
AA183C / AA183CTEC / AA183MTEC	IMX183	800	800	50	12
AA678C / AA678M	IMX678	810	100, HCG	500	14
AA462C / AA462M	IMX462	260	100, HCG	50	12
AA269C & AA269CTEC	IMX269	800	800	50	12

 

* SharpCap automatically handles the High Conversion Gain (HCG) setting for compatible cameras.
When the gain is set within a specific range, SharpCap automatically activates HCG mode.
This simplifies the process for users as it eliminates the need for manual switching between Low Conversion Gain (LCG) and HCG modes.
Automatic Switching:
SharpCap detects when a camera with HCG/LCG capability is used and automatically handles the switch based on the gain setting.
Gain Range:
The specific gain range for HCG activation varies between camera models. For example, on the IMX585 sensor, it’s around 1365, while on some Altair cameras, it’s around 520.
No Manual Switch:
Users typically don’t need to manually switch between LCG and HCG. SharpCap handles this in the background.
Consistent Brightness:
The automatic switching is designed to maintain a consistent brightness level as the gain is adjusted, preventing sudden jumps in image brightness.
Benefit of HCG:
HCG mode generally reduces read noise at higher gain settings, which can be beneficial for low-light astrophotography.