Ed Astle:
You do have the reducer around the right way?
A reducer around the wrong way "seems to work" but gives a bright outer ring, the antithesis of vignetting.
I know this because I recently got my Daystar 0.5x around the wrong way for solar work.
I looked at every conceivable point of failure before there was only one left - me!
I had T2 both sides and I wasn't paying attention... It isnt, the reducer 0.6x for 103APO is impossible to put the other way round
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It looks 100 percent like dew. So i bet you did not use a dew heater?
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It looks 100 percent like dew. So i bet you did not use a dew heater? I did but at the front, maybe dew is forming within the other elements of the scope?
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Konstantin:
I did but at the front, maybe dew is forming within the other elements of the scope? Not very likely or, more precisely, very very very unlikely for a refractor. You have a inner reflection/light leak issue and that's it.
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I used a 1x flattener that is made for the 103APO and the rings have disappeared!!
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There you go, you found the culprit e.g. the reducer/flattener has a reflective component that created the "RING".
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