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Old 07-08-2012, 07:35 AM
Poita (Peter)
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Poita is offline
 
Join Date: Jun 2011
Location: NSW Country
Posts: 3,586
It is just harder to get perfect tracking with a longer focal length scope, and you typically get a smaller FOV.

The disadvantage with the ED80 to me is that it is only good for really big targets, its focal length is way too small for tiny, faint galaxies etc.
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