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The 80mm extension tube arrived a while back but I have only just managed to get out to test it. All good! The DSLR will now reach focus with the drawtube out only 35mm. So in theory I actually could of gotten away with a 50mm (to allow a bit of play) extension. I don't think there is any detrimental effect to having the extra drawtube inside the scope as far as astrophotography goes but maybe some more knowledgeable could tell me if there is. When I start adding reducers / flatteners then I imagine the shorter extension will be necessary.
Cheers
Dave
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