ASI071MC-Pro Question

privateer

Hi, I was doing some post-processing from a rather cool night -2C with the ASI071MC-Pro. I was doing 90sec exposures at Unity gain (94) and sensor temp of -20. Why is there a dark patch in the lower right? It appears to come out with background extraction but I am not sure what caused it. I haven't noticed it in previous nights where I was doing 60sec exposures at 130gain and -15C.

Support@ZWO

Do you use some filters? It's looks like some adapter or filter too narrow and cause vigneeting problems.

privateer

AHHH, not the 2" UV/IR filter but it was the OAG prism getting to close to the light path!

Thanks Sam

Support@ZWO

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