SharpCap Forums

Hi Robin, My apologies for not being clear enough in what I meant by the Image Control Menu. I attached an image file of what I meant that's shown in SharpCap. What I'm referring to is that the digital gain goes from 1 to 255, and it would be great if it went from 1 to 14 so I can directly match it ...

Hi Robin, I know that this is a rather old thread, but I thought I would revisit this issue to see if there's any more sense that I can get out of it. My 168c does not accept non-integer values of the gain. i.e., 1.6 won't work, but 1 or 2 will. I thought I would retry the sensor calibration process...

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 ...

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 ...

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...

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 ...

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...

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

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...

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...