I've been doing a lot of imaging of Jupiter lately before the monsoon season hits this week here in Arizona. I'd say I am intermediate as far as skill level at this point. I've noticed that on many of the images taken with both a ZWO ASI224MC and my recent upgrade to an ASI290MC, when using the ROI in FireCapture, the planet's disk has soft edges - almost like vignetting. Is this normal or am I doing something wrong? I've attached an image taken with my Edge 9.25HD. Processed in AutoStakkert!2 and RegiStax. Good seeing and transparency, with Jupiter near the meridian, scope at ambient temp., excellent tracking. Here's the log info. Thanks for any suggestions.
FireCapture v2.5 Settings
CMI=269.7° CMII=332.7° CMIII=206.0° (during mid of capture)
Extended AVI mode=true
Sensor temperature=27.6 °C