QHY 183M Amp Glow Removed...Finally (Alex Roberts)

Celestial hemisphere: Southern · Constellation: Serpens (Ser) · Contains: Eagle Nebula · IC 4703 · M 16 · NGC 6611 · Star Queen

QHY 183M Amp Glow Removed...Finally, Alex Roberts

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QHY 183M Amp Glow Removed...Finally

Link: https://alexroberts.smugmug.com/Alex-Roberts-Astrophotos/

Powered byPixInsight

QHY 183M Amp Glow Removed...Finally

Link: https://alexroberts.smugmug.com/Alex-Roberts-Astrophotos/

I posted this image to help those who have a QHY 183M (or the ZWO equivalent ASI183MM Pro) and have trouble removing the substantial amp glow the IMX183 sensor often produces. For the past few months, I’ve struggled with stubborn amp glow that refused to calibrate out with darks, flats and bias frames. The amp glow appears worse with long narrowband exposures over five minutes. The situation got so bad I thought my camera was defective and needed replacement.

This week, I tried once more with new drivers and camera settings. To my surprise, the amp glow completely disappeared! Since I changed drivers and the settings together, I’m not sure which did the trick. I only know the following worked in my case. Your mileage may vary.

1. Update Sequence Generator Pro to the latest version.

2. Update to the latest ASCOM platform.

3. Update native and ASCOM camera drivers

4. Set gain to 14

5. Set offset to 30

6. Set USB traffic to 0.

7. Take light, dark, flat and dark flat exposures, then stack with the software of your choice. (Bias frames don’t seem to help.)

I hope this information helps those who are struggling to eliminate amp glow caused by IMX 183 CMOS sensors.

Addendum: Capturing dark frames that are as close to the same temperature as the light frames is important. In this case, I captured the dark frames in the first half of the night, so I expect these were at a slightly higher temperature. Camera was set to -15C.

Final
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B

B

Description: Bad amp glow! An example of the typical starburst amp glow that appears on each long exposure sub taken with IMX183 Sensors. This is often difficult to remove through calibration and stacking.

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