Quote:
Originally Posted by multiweb
That bright arc is most likely a shiny edge in your focuser or adaptors.
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Marc
Thanks for the suggestion
I checked my focuser tube and it was flush with the inside of the OTA and is coated Matt black.Also check my adapters , coma corrector too and they are all coated so I don’t believe those were at fault
What I do know is that a tiny bit of stray light seems to be hitting my gutter from the street behind me which is west ( 60m away ) obviously a street light and the target was getting low towards the west. So maybe that’s it
Never come across this issue before and I’ve had this scope for over 3 years
Anyway I imaged the Rosette last night , processed the image and no issue with this unknown curve anomaly
Thanks
Martin