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 Post Posted: Mon Jan 09, 2017 7:14 am 
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I'm facing an issue with dark calibration and ASI 1600MMC. It seems that the dark frame is not calibrating the light frame as it should. I still see some brightening. The temperature, exposure, gain and all the settings are the same.

Dark optimization is off while calibrating. Lowest read noise settings and bin 2x2.

Does someone have any clue?. Is the horizontal banding also normal?.

Many thanks,
Manuel.

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 Post Posted: Mon Jan 09, 2017 1:44 pm 
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Try reading the posts from Jon Rista here:
http://www.cloudynights.com/topic/487977-can-we-talk-seriously-about-flatdarkbias-frames/page-2


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 Post Posted: Mon Jan 09, 2017 2:55 pm 
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rkayakr wrote:


Done, but found nothing interesting.


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 Post Posted: Wed Jan 11, 2017 3:00 pm 
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can you tell how long did you exposure? USB2 or USB3?

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 Post Posted: Wed Jan 11, 2017 8:21 pm 
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Exposure of 3 sec high gain settings, bin 2x2. I've also tried with 10 seconds unity gain with no luck.

Usb3 port but recognized as usb2


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 Post Posted: Thu Jan 12, 2017 7:09 am 
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Dark, bias and light frames can be downloaded here:

https://drive.google.com/file/d/0BzEnHf ... sp=sharing


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 Post Posted: Thu Jan 12, 2017 2:58 pm 
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you'd better choose 5-10s exposure if connect through USB2.0
otherwise there is more amp-glow with 3s exposure
the very small horizontal banding is normal
CMOS is not as clean as CCD

you need to upgrade host usb3.0 driver if cannot recognized as USB3.0 device

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 Post Posted: Thu Jan 12, 2017 8:24 pm 
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Sam wrote:
you'd better choose 5-10s exposure if connect through USB2.0
otherwise there is more amp-glow with 3s exposure
the very small horizontal banding is normal
CMOS is not as clean as CCD

you need to upgrade host usb3.0 driver if cannot recognized as USB3.0 device


10s exposure bin 2x2 also don't calibrate well. Are you sure this is normal operation?. This is not even usable for me:

http://imgur.com/VP2H8L0

Will connecting the camera via usb3 get better correction?.


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 Post Posted: Tue Jan 17, 2017 8:53 am 
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ManuelJ wrote:
Sam wrote:
you'd better choose 5-10s exposure if connect through USB2.0
otherwise there is more amp-glow with 3s exposure
the very small horizontal banding is normal
CMOS is not as clean as CCD

you need to upgrade host usb3.0 driver if cannot recognized as USB3.0 device


10s exposure bin 2x2 also don't calibrate well. Are you sure this is normal operation?. This is not even usable for me:

http://imgur.com/VP2H8L0

Will connecting the camera via usb3 get better correction?.


do you think is it because of light polution?
I don't think 1600 has such amp-glow

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 Post Posted: Tue Jan 17, 2017 12:20 pm 
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Connecting via usb3 makes the image much cleaner, I've had no opportunity to check if the dark corrects as it should, but I think there is clearly a problem if the camera is used via usb2.


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