ASI6200: What's the meaning of 'gain 72' in 'highest dynamic range'

hiromu

Recently, I noticed the gain 72 in the FITS headers which I recorded DSO imaging files.
My understanding, gain 0 would be the highest dynamic range setting in most of the cameras. and ASI camera description shows gain 0 is 14 stops for the range. The gain 72 shows about 12 stops. Why ZWO Ascom driver program force to gain 72 in default ? If tried to gain 0 in setting, they show out of highest. Is it experimental setting?
Please explain.

Regards
Hiromu
Japan

Tech@ZWO

hiromu Why ZWO Ascom driver program force to gain 72 in default

I don't think there is such default, can you attach some screenshot about this?

hiromu

Hi, ZWO staff

Sorry, I could not reproduced it again. Driver seems just normal, now.
I can set 'highest D range' as 'gain 0' in default. and it did not switch back to gain 72.

I always use SGP 64bit, it had been only supplied as beta till 23th July. It had some bugs or troubles there, I and they confirmed. Last week end, I find SGP 64 stable version had started, and I replaced. I don't think SGP would harm the ASCOM drivers in normal, though it could happen. I confirmed SGP can't control Pegasus switch driver in properly as now. so, I deleted that driver. The trouble, Pegasus switch will stop the SGP staring when not connected, disappeared.

That behavior of gain 72 appeared in SGP 64 beta version. It may happen when back it again. In Last month, when I select 'highest D', they show 72 in the slider, and moved to Zero manually, it showed 'manual' as mode. It's all mystery!

Anyway, It seem solved. Sorry for bothering.

Regards
Hiromu
Japan