Noisy image QHY5LII-C
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Noisy image QHY5LII-C
Has anyone noticed the image noise in version 2.9? I am using a QHY5LII-C, and the first time I started V2.9 I noticed significant noise on the image, thinking it was something I was doing wrong I spent a considerable amount of time trying to fix it, without success, finally I switched back to V2.8 and, lo and behold no noise. What has happened?
Re: Noisy image QHY5LII-C
Update: I've just discovered V3.0, just the same noise as 2.9, for me neither 2.9 or 3.0 are useable.
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Re: Noisy image QHY5LII-C
Hi,
could you post a screenshot of the problem so I can see what sort of noise you are getting and also see what values you have for various controls. A pair of screenshots (one for 2.8 and one for 3.0) would be great to compare.
thanks,
Robin
could you post a screenshot of the problem so I can see what sort of noise you are getting and also see what values you have for various controls. A pair of screenshots (one for 2.8 and one for 3.0) would be great to compare.
thanks,
Robin
Re: Noisy image QHY5LII-C
Thanks for your reply.
Ok, I'll do that next time I set the scope up, hopefully next weekend weather permitting.
Ok, I'll do that next time I set the scope up, hopefully next weekend weather permitting.
Re: Noisy image QHY5LII-C
Hi Robin
I've taken a couple of snapshots but the png file size is too big to attach and I don't want to reduce the quality to jpg. Is there another way to get them to you?
Just an observation; I noticed that with 2.8 the exposure setting has to be a lot higher than with 2.9 and 3.0. In 2.8 if I increase the gain so that the exposure is the same as 2.9/3.0 then the image quality/noise is much the same. So it appears that the issue has something to do with the camera gain setting.
I've taken a couple of snapshots but the png file size is too big to attach and I don't want to reduce the quality to jpg. Is there another way to get them to you?
Just an observation; I noticed that with 2.8 the exposure setting has to be a lot higher than with 2.9 and 3.0. In 2.8 if I increase the gain so that the exposure is the same as 2.9/3.0 then the image quality/noise is much the same. So it appears that the issue has something to do with the camera gain setting.
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Re: Noisy image QHY5LII-C
Hi,
sounds like you have tracked down the cause to a higher gain setting, which would be expected to give significantly more noise. I keep the attachment size limited because I don't want to end up with high res astro images needing to be stored on the forums server (and backed up too). Best way to send larger files is you use an alternative image sharing service or a file sharing service like Google drive, DropBox, OneDrive, etc. and share a public link to the files in question.
cheers,
Robin
sounds like you have tracked down the cause to a higher gain setting, which would be expected to give significantly more noise. I keep the attachment size limited because I don't want to end up with high res astro images needing to be stored on the forums server (and backed up too). Best way to send larger files is you use an alternative image sharing service or a file sharing service like Google drive, DropBox, OneDrive, etc. and share a public link to the files in question.
cheers,
Robin
Re: Noisy image QHY5LII-C
Hi Robin
I agree it has to be the gain setting, in 2.9/3.0 the minimum gain shows as 1 but is roughly equivalent to maybe 15-20 in 2.8. Anyhow here's a link to the files on drop box.
https://www.dropbox.com/sh/bsued1mls72y ... EAIga?dl=0
Let me know when you have them so I can remove them.
Mike
I agree it has to be the gain setting, in 2.9/3.0 the minimum gain shows as 1 but is roughly equivalent to maybe 15-20 in 2.8. Anyhow here's a link to the files on drop box.
https://www.dropbox.com/sh/bsued1mls72y ... EAIga?dl=0
Let me know when you have them so I can remove them.
Mike
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Re: Noisy image QHY5LII-C
Ah, now I understand the issue - the gain values have definitely changed between 2.8 and 3.0 - looks like it is down to the QHY SDK (new version) having a bug. I will pass the info on to QHY. Please leave the sample files online for the moment as I will share the link with QHY.
cheers,
Robin
cheers,
Robin
Re: Noisy image QHY5LII-C
Hi Robin. Have you finished with the images yet?