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Thanks for the input and comprehensive replies.
Greg - my 550D will be relegated to daytime photography, as I am pretty disappointed with it. It is no use on my Solarmax DS90 and too noisy to be used in astro way. Obviously I will try out the lens on the camera, but the primary use will be with the ST8300/CFW8. I have no idea at this point whether I will need extra adapters to come to focus....I obviously have the one adapter that interfaces the CFW to the lens.
Phil - thanks a lot. I think I will follow your advice and opt for the 50mm.
cheers
Martin
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