QHYCCD

QHY294M Pro - problems with "flare" in all images

QHY294M Pro - problems with "flare" in all images
« on: March 05, 2021, 10:48:53 AM »
Started using my new 294M Pro last night and noticed that all exposures (no matter which filter) have the same "flare" coming from the right side of the frame - doesn't matter what the target is - any part of the sky.  When I first noticed, I thought it might be a bright star off the frame but that's not the case - VERY noticeable in the longer Ha and OIII exposures.

Re: QHY294M Pro - problems with "flare" in all images
« Reply #1 on: March 06, 2021, 11:27:35 AM »
Hi,

I have the same pattern in my QHY294C and I think it's amp glow.
However, it calibrates out with proper dark frames, at least for me.

In my dark frames the visibilty of the pattern increases with exposure time which also suggests that it is amp glow.

best regards
Bernd
 

Re: QHY294M Pro - problems with "flare" in all images
« Reply #2 on: March 07, 2021, 02:51:19 PM »
Ya -  a little more research has pointed to that - thanks for responding.

Out again tonight - M1 is in my sights...

llsong

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Re: QHY294M Pro - problems with "flare" in all images
« Reply #3 on: March 07, 2021, 08:20:25 PM »
Hello
Bernd is right. This is the CMOS amp glow, which belongs to the characteristics of this CMOS chip. It is a normal phenomenon. You can eliminate it by dark field calibration.

buzz

Re: QHY294M Pro - problems with "flare" in all images
« Reply #4 on: March 15, 2021, 08:02:13 AM »
It will completely calibrate out.... but you need to use flats and darkflats, rather than darks and bias, as you would with a CCD.
Chris Woodhouse FRAS