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Old 12-10-2007, 10:01 AM
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JohnG (John)
Looking Down From Above

JohnG is offline
 
Join Date: Dec 2005
Location: Cootamundra, NSW
Posts: 1,711
Following on from what Jase said, the various combinations for your ED80/350D are:

2x Barlow - 1200mm fl - 1.12 arcsecs/pixel

Prime focus - 600mm fl - 2.19 arcsecs/pixel

0.8 reducer - 480mm fl - 2.72 arcsecs/pixel

Given that typical seeing is around 2 arc seconds the use of the 2x barlow is limited by the seeing.

Cheers
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