Quote:
Originally Posted by batema
I am using a Canon 200mm L f2.8 prime with a UV filter attached to the front.
Mark
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That's it, just as I though (houghy too).
The UV Filter will do that, causing a (usually green) internal reflection off the back of it.
I always have high quality UV filters on all my lenses but I take them off when doing astro.
RB
