Search found 17 matches

by glauria
Mon Oct 07, 2019 8:05 pm
Forum: QHY Cameras
Topic: QHY168c Gain Scaling question
Replies: 29
Views: 2552

Re: QHY168c Gain Scaling question

Very good Robin, So this brings me all the way back to the beginning of this post where I am trying to get an idea how QHY's 0 to 14 scale maps to Sharpcap's 1 to 255. Since it looks like the sensor analysis tool doesn't tend to work very well since the gain isn't related to decibles, it's hard for ...
by glauria
Fri Oct 04, 2019 7:59 pm
Forum: QHY Cameras
Topic: QHY168c Gain Scaling question
Replies: 29
Views: 2552

Re: QHY168c Gain Scaling question

Very good Robin, That will explain the difficulties that I've been running into by using the sensor analysis tool. I'll just have to experiment and see which sharpcap gain settings will work. Alternatively, I can use another way to capture images and store them into a folder and then load them into ...
by glauria
Fri Oct 04, 2019 1:02 am
Forum: QHY Cameras
Topic: QHY168c Gain Scaling question
Replies: 29
Views: 2552

Re: QHY168c Gain Scaling question

Robin, Something still isn't making sense to me in regards towards the unity gain value being between 1 & 2 which to me seems way too low. I think I said this in an earlier post, but the generic gain range that QHY posts on their web page for this camera is from 0 to 14 where 10 is the value for uni...
by glauria
Thu Sep 05, 2019 8:40 pm
Forum: QHY Cameras
Topic: QHY168c Gain Scaling question
Replies: 29
Views: 2552

Re: QHY168c Gain Scaling question

Thanks Robin, At least these measurements confirm where the unity gain setting is. Insofar as the read noise is concerned, I'm not surprised that it doesn't drop off. If you look at the read noise vs. gain graph that QHY posts for the camera, it's pretty constant over the entire gain range. Its max ...
by glauria
Thu Sep 05, 2019 4:06 pm
Forum: QHY Cameras
Topic: QHY168c Gain Scaling question
Replies: 29
Views: 2552

Re: QHY168c Gain Scaling question

Thanks Robin, I'll download the latest version of Sharpcap and run another sensor analysis to see if there is much of an improvement. I'll post the graph of the results to see what it's like by taking more samples at the lower gain levels. -Gene Robin, Here are the results after running v3.2.6086.0...
by glauria
Wed Aug 21, 2019 11:35 pm
Forum: QHY Cameras
Topic: QHY168c Gain Scaling question
Replies: 29
Views: 2552

Re: QHY168c Gain Scaling question

Thanks Robin,

I'll download the latest version of Sharpcap and run another sensor analysis to see if there is much of an improvement. I'll post the graph of the results to see what it's like by taking more samples at the lower gain levels.

-Gene
by glauria
Thu Aug 08, 2019 7:53 pm
Forum: QHY Cameras
Topic: QHY168c Gain Scaling question
Replies: 29
Views: 2552

Re: QHY168c Gain Scaling question

Great Robin, I'm glad that I the data I provided helped to give you a better understanding on what's going on. I'm not sure if other QHY users ran into the same situation when they performed the sensor analysis for their cameras. I'm sure that once you make this change, my results will make a lot mo...
by glauria
Thu Aug 08, 2019 2:54 am
Forum: QHY Cameras
Topic: QHY168c Gain Scaling question
Replies: 29
Views: 2552

Re: QHY168c Gain Scaling question

Hi Robin, I did the gain test that you suggested (sorry, it took a while since I was on vacation). First test was setting the gain at 1 and adjust the exposure to put the histogram at 50%. Gain: Exposure Time: Mean count: 1 315 ms 34535 25 12.4 ms 35515 255 1ms 31453 I also did a test where I starte...
by glauria
Sat Jul 06, 2019 7:00 pm
Forum: QHY Cameras
Topic: QHY168c Gain Scaling question
Replies: 29
Views: 2552

Re: QHY168c Gain Scaling question

Hi Robin, Here are the results from the procedure that you outlined in your previous post for calibrating the gain. I repeated the procedure twice at two differnt light levels. My camera is a QHY168c: Time (mS) Gain (a.u.) 275 1 27.5 10 2.8 90 0.3 --- (Still below 50% at max. gain = 255) ...at anoth...
by glauria
Fri Jul 05, 2019 5:30 pm
Forum: QHY Cameras
Topic: QHY168c Gain Scaling question
Replies: 29
Views: 2552

Re: QHY168c Gain Scaling question

Hi Robin, I can confirm the issues that "bwells" is running into with his QHY165 with my QHY168c. The last time I was out with my camera, I tried to use the "brain" icon after I did the sensor analysis with my camera. I think the results were relatively useless because no matter how many times I tri...