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Oh I realised I said 2 reasons then only posted 1!
The other reason (and I don't know if this is true in some of the high end lenses) is that camera lenses because they are not magnifying so hard as in telescopes, they are not figured to the same accuracy. If they were then we would have $10,000 lenses for a decent lens and they are often under $1000.
So telescopes are usually made to a much more demanding standard (at least I think so). It seems to bear out that way as most lens shots are usually showing less detail than APO telescope shots with perhaps Marco's images being the exception.
Greg.
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