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It certainly is Chris.
I have recently bought an adapter to put my 70-200 F2.8 nonIS lens on my SBIG camera. First decent pic the other night attached. Taken at 200mm, external mask to stop it down to about F4.4, 12x5 min subs. I also put a longer light shield on to limit reflections as my first efforts were plagued by them. Need to stop down a bit further as stars not round at the corners. Have made another mask this morning to give about F5.4.
Neale.
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