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Thanks All for your encouraging advice.
Chris - The field diameter for this fr is 29mm and a full frame Canon has
a diagonal width of 42mm so I suppose you would get a bit of vignetting
around the corners. My Canon 400D has a diagonal width of 27mm which
is just inside the 29mm limit.
Shaun - The 85mm backfocus will suit me fine as I know that my 200mm RC will accomodate this with some forward focus left (with all the RC spacers removed). Good site - I will probably purchase the fr from them.
Cheers Peter
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