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Old 18-03-2015, 03:02 AM
clive milne
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clive milne is offline
 
Join Date: May 2011
Location: Freo WA
Posts: 1,443
Have you considered an FSQ106?
You can use it as an 850mm F8
530mm F5 (with an unvignetted field 88mm in diameter)
or 385mm f3.6

It is probably a bit sharper than the Cannon lenses, a fraction of the cost and can be used as a telescope should you want to.
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