Quote:
Originally Posted by Joshua Bunn
Thanks for getting these Peter. If i look carefully in your second image i can just see a blue ring same as mine but fainter - can you see it?
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Yes I can see it if I stretch the image a long way, definitely not visible in the eyepiece though no matter where I look.
I guess a test would be to use a fake star and see if the problem shows up.
It may be something inherent in these scopes, but it shouldn't be as obvious as in your photos.
I'm really interested in tracking down the source.
[EDIT]
I have tried letting the corrector dew up just a little bit, and the ring becomes far more prominent, just like in your images.
It could be a problem with the coatings on your corrector plate, I'd almost put money on it.
Or it could be a thin film of something on your corrector, maybe on the inside?