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OK so what is causing the arcs of light in the photo? Its consistent between frames (LRGB) but varies by target in the sky.

This is a Astro Tech AT65EDF Quadruplet and a ST8300M

Ideas? I think its obvious reflections but off of what?

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Comment by Conor on March 30, 2012 at 10:59am

Wat.

Comment by Marc Basti on March 28, 2012 at 5:22pm

Jeff, I thought for sure it was the differential mitobia. LOL that was a good one.

Comment by Dave Lane on March 28, 2012 at 5:00pm
Conor you rock and are a hell of a cool dude despite everything Jeff says about you.
Comment by Jeff McFarlin on March 28, 2012 at 2:43pm

Conor - you meant to say: There was an unbaffled/unmatted differential mitobia inside the focuser...., but s'ok, we knew that.

Comment by Conor on March 28, 2012 at 2:26pm

I diagnosed the exact issue with another guy recently. There was an unbaffled/unmatted surface inside the focuser. It caused the exact same class of reflections.

Comment by Marc Basti on March 28, 2012 at 2:07pm

It's that mitobia stuff, I've seen it before and it's nasty!

Comment by Jeff McFarlin on March 28, 2012 at 12:25pm

It's the television tripartite Narrow-Wave EM reflection in the 600Megaspotz region causing differential mitobia on your CCD. Quite obvious if you look at the curves.

Comment by Dave Lane on March 28, 2012 at 12:24pm

Not sure on the alien stuff :) It does have a dew shield that extends -34"

Comment by Charles Dunlop on March 28, 2012 at 12:23pm

I think it's aliens doing a high speed race above your house, be careful man, you don't want to let them know you are watching.

Comment by Russ Ruggles on March 28, 2012 at 12:22pm

Looks like lense flaring caused by an outside light source. The same light source would be hitting it at different angles when you move to a new DSO.

If not from the front then from the side.....
My AT80 had a screw on mount plate which I took off. I covered that empty hole with tape.

Just guessing.... Did I win!!!!??? :)

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