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Change in camera, coma returned


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Good evening all,

I have recently purchased a ZWO ASI 071MC-Pro camera as an upgrade from my DSLR. Having used a coma corrector previously (Skywatcher one I believe), I transferred this to the new setup. Having taken a few shots last night, I can see major coma around the edges (penetrating up to approximately one third of the depth of the image) of the images, much alike when I used to shoot with the DSLR with no coma corrector. The corrector is attached directly to the camera via the supplied adapter (approx. 10mm).

My questions are:

  • Is this typical?
  • Do I need an alternative corrector?
  • Do I need an alternative spacer?
  • Is there anything that I could have setup wrong to produce the coma?

Thanks in advance!

Scope is Skywatcher PDS130 with standard focuser.

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  • "Do I need an alternative spacer? The corrector is attached directly to the camera via the supplied adapter (approx. 10mm)"

In the manual it states:

The M42 female flange to the sensor is 17.5mm. You can reach 55mm back focus distance with the 21mm and 16.5mm extender included in the camera package

hope this helps although i don't actually own this camera

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  • 4 weeks later...

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