Observation by Peter Tickner: Jupiter OSC comparison

Uploaded by

Peter Tickner

Observer

Peter Tickner

Observed

2022 Sep 15 - 23:30

Uploaded

2022 Sep 16 - 16:05

Objects

Jupiter

Equipment
  • ZWO ASI462MC and ZWO ASI482MC
  • 2.5x PowerMate + ADC, 4x PowerMate + ADC
  • 14inch f/10 LX200ACF SCT
  • EQ8 mount
Location

Urban Berkshire

Target name

Jupiter

Title

Jupiter OSC comparison

About this image

This test may be of interest to planetary imagers using one shot colour cameras (OSCs).  Both images have been stacked in Autostakkert, processed in Registax and post-processed in Paint Shop Pro and then Topaz DeNoise identically.  Two years ago I switched from my usual planetary camera, the mono ASI174MM to the then new ASI462MC, a colour camera that is also very sensitive in IR and has the same pixel size at 2.9 mu of the mono ASI290MM. While I was happy with the image scale on Mars as well as Jupiter and Saturn that year I wasn't totally happy with the image, which always seemed to me to be slightly washed out in colour and slightly less sharp than if I had used a mono camera.  I persisted due to its convenience but more recently purchased an ASI482, which is meant to be an entry level all round OSC camera and coincidentally has the same pixel size as the old ASI174MM (5.86 mu).  To my surprise I found it produced images as sharp as the ASI174 for Jupiter and Mars when both were used with my 4x PowerMate, which gave an identical image scale to using the ASI462 or 290 with a 2.5x PowerMate.  The ASI174 doesn't really gather enough light for Saturn to operate at the exposures I wanted but I found that the ASI482 could do although it can't operate as fast as the 174 or indeed quite as fast as the 462.       

In this test I ran the 462 and 482 at identical image sizes by using the 2.5x PowerMate with the 462 and the 4x PowerMate with the 482. For the same exposure length on Jupiter the 482 ran slightly slower, at 72fps compared to 76fps, hence the 462 had 3,500 frames per video and the 482 3,200 frames per video in the same time (to ensure no blurring by rotation of Jupiter).  Seeing did vary slightly but towards the end of use with the 482 it became distinctly worse.   I think the 462 has a problem with colour bleed and the IR sensitivity while great for IR imaging and methane filter use on Jupiter does seem to work to its disadvantage in terms of sharpness of image compared to teh 482 which does a good job of matching the sharpness of mono cameras.

Peter

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