Quote:
Originally Posted by codemonkey
I'm suspecting this might be the flip-flat reflecting some LEDs. I have two LEDs on circuit boards on my focuser, one on the laptop and one on a power source.
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That's easy to check, put black tape over the sources.
If it is not those, try a more controlled experiment by imaging a field with an isolated bright star (1st-3rd mag for example) just outside the FOV. Then take more subs as you move the star further away. The bright star will allow you to see any tube/imaging train reflections in short subs so that you can diagnose it quickly (without having to stack a bunch of long exposures).
I had bad arc/reflection problems on my CDK20 a few years ago, once fixed (flocking inside corrector lens cell and on the shiny carbon fiber truss tubes) I could not detect any funny rings from the star Altair just outside the FOV (see attached).
Best,
EB