# 13 Feb, 2018 09:52
I tried my luck at the official ZWO-Forums, but didn't get a response until now, and tonight will be clear skies at my location, so i wonder if here is anybody who can give me an advice about this topic:
After more than half a year using the great ASI178MC with several combinations of Gain/Offset, i thought it would be a good idea to stick to only a few standard combinations. So after reading through many posts in several forums i'd like to discuss if these combinations do make sense or if i need to adjust them (the numbers represent the settings in SharpCap, where Gain=Gain and Offset=Brightness):
Thanks in advance for any advice!
# 13 Feb, 2018 20:51
|Okay, forget what i've written. These settings don't work :-(|
# 19 Feb, 2018 16:39
I have also been searching for the same information for the ASI178mc and have found very little until recently. Check this link from the camera manufacturer’s website:
The mini article is about the ASI1600 and ASI071 gain settings however the 3rd question down from a customer (Nicolas) asks about gain settings for the ASI178mc. ZWO Founder, Sam Wen, says to use the gain settings listed in the ASCOM driver for the ASI178mc. When I checked the ASCOM settings using SGPro here is what I found:
Unity Gain ==> Gain: 180 Offset: 25
Highest Dynamic Range ==> Gain: 0 Offset: 25
Lowest Read Noise ==> Gain: 270 Offset: 340
I also sought some guidance from the very helpful folks at cloudbreakoptics.com out of Seattle where I’ve bought most of my telescope equipment and they generally recommended using a gain of around 50-100 for DSO and a higher gain, perhaps ~300+ for brighter planetary targets.Up to this point I have been experimenting with gains in the 250-330 range using short exposures, unguided. My results are fairly mixed so far. I live in an area with a lot of light pollution which tends to dominate my photos. I am awaiting the arrival of a guide camera and scope along with a light pollution filter this week and I intend to try these recommended settings at my first opportunity.
Hope this helps,
# 19 Feb, 2018 19:12
thanks fpr your reply. I played around recently with SharpCap (native drivers, no ASCOM) and the gain/offset settings. Whenever i touch the brightness value (which i believe to be offset) the images are way too oversaturated - just white. Maybe i am doing something wrong, but at the moment i leave the brightness value at zero.
I am using gains between 64 and 256 depending on the target. I tried short exposures, but then i could not align the images due to too less stars in the field of view. At the moment i try to reduce the differential flexure on my autoguiding setup (see https://www.astrobin.com/333878/?nc=user ). When this is fixed i'll come back to the problem with gain/offset combinations.
Nevertheless i am happy for your reply and wish you good luck with your new equipment.
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