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Old 09-03-2012, 07:18 AM
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Phil Hart
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Phil Hart is offline
Join Date: Jan 2007
Location: Mount Glasgow (central Vic)
Posts: 1,082
Originally Posted by Martin Pugh View Post
Thanks for the info Phil - 44mm - Clear skies tomorrow night are forecast, so I am going to work the lens from f2 and up to see what happens.
The ST8300 has 17.5mm backfocus, and the FW8300 has 20mm - so thats 37.5mm. The Canon lens adapter easily adds probably 5mm or so, I have not measured it (but will), so that puts it very close, assuming a delta of perhaps 1.5-2mm is not critical - it probably is at f1.2.

I'm not sure how critical the spacing is.. but would love to know!

With the correctors on fast newts, anything more than 2mm out is significant. Not sure what that means for lenses? Would think you would be ok by f3?

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