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CCD Camera / Re: Vertical strips in QHY5L-II-M camera
« Last post by Alexander Obukhov on Today at 02:43:02 PM »
Bad vertical pattern is the illness of almost any Aptina sensor. I used IMG132E (with Sony's IMX035) and I can say, it is far better in terms of pattern noise (FPN is absolutely negligible).
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CCD Camera / Re: Vertical strips in QHY5L-II-M camera
« Last post by Alexander Obukhov on Today at 02:34:57 PM »
Flat division can't eliminate the vertical pattern of that camera. Only dark substraction can reduce this effect. But you must capture dark sequence immediatly after capturing of object without any changes of gain and exposure time.
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CCD Camera / Re: Vertical strips in QHY5L-II-M camera
« Last post by QiuHY on October 24, 2014, 08:30:09 PM »
Hello,
       Can you post a unstacked image(raw image ,single frame ) to show this issue?

       During the development of minicam5s, we also noticed such vertical column and we have found good method to remove it. There is two things effect this:

1.If temperature changed, the cmos need to do a vertical noise calibration
2. ASCOM may have a bug cause the strong vertical lines. (while EZPlanetary has no this problem. Please compare them and check if it is this problem).


Best regards,
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CCD Camera / QHY5V mono subframe brightness
« Last post by sven on October 24, 2014, 05:51:55 PM »
Hi,

I've noted an odd thing about using the subframe feature of QGVideo32 with a QHY5V: The brightness of the images is reduced by about 20% (at least in the following example). I created 2 images to demonstrate the issue:
https://owncloud.geeq.de/public.php?service=files&t=65741eea21d23dbeae6504aa876c75ad
https://owncloud.geeq.de/public.php?service=files&t=f28c3c006c1c21c07a69c53f86189af6
(I used a simple pinhole setup and took a few frames of the room lights while holding the camera in my hands. This method is not perfect but this effect also appears while taking photos of planets.)

Does anyone know whether this is a bug in QGVideo, the driver or expected behaviour of the camera? I would like to fix this if necessary by myself, but a place to start would be nice.

And another question, because I do not have my camera at hand: How's the MT9V032 connected to the Universal Serial Bus?

Regards
Sven
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Astronomical Photography / Re: M42 (Trapezium) and NGC 7009 with QHY5L-2 & C11
« Last post by Mich1 on October 24, 2014, 09:38:33 AM »
Wonderfull shots, well done.
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CCD Camera / Re: Vertical strips in QHY5L-II-M camera
« Last post by Mich1 on October 24, 2014, 09:31:06 AM »
Yeah, making good bias corrected flat is crucial, also keep in mind that good darks(very close to light temperature) are also very important since the camera is not cooled. And as Maximo said dithering also helps a lot with such issues. The last thing is to have the expossures skynoise limited(long enough so the system noise gets buried in sky noise, othrewise you will need a lot more exposures to average out all these issues and get a good image).
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Astronomy equipment Discussion board / Re: 64 bit
« Last post by bmgscott on October 24, 2014, 08:41:42 AM »
Thanks Luotong just the answer I was looking for.

Cheers

Bob
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Astronomy equipment Discussion board / Re: 64 bit
« Last post by luotong on October 23, 2014, 06:19:03 PM »
Hi,

The native drivers and ASCOM can support 64 bit computer with no problems.

best regards.
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Astronomy equipment Discussion board / 64 bit
« Last post by bmgscott on October 23, 2014, 03:12:19 PM »
I am going to try and run my observatory with a new computer it is 64 bit I have always used and am still using 32 bit with no problems I use a QHY 5, 8 and a 9 will they work on a 64 bit computer with their native drivers and ASCOM ? if so is there anything I need to be aware of.

Cheers

Bob
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CCD Camera / Re: Vertical strips in QHY5L-II-M camera
« Last post by riklaunim on October 23, 2014, 01:20:24 PM »
Non uniform gain. Flat frame needed.
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