Damn pedant. :)
I wuz working from a poor memory rather than a deep understanding. as
usual!
Andrew Fildes
afildes@xxxxxxxxxxxxx
On 07/05/2006, at 6:04 PM, Moose wrote:
> Also, you've got the length wrong. With a simple 90 mm lens, 1:2 would
> require 45 mm of forward extension by the helicoid and 1:1 would
> require
> a 45 mm tube, for a total extention at 1:1 of 90 mm. With the actual
> design of the 90/2.5, the matched Tamron 18F extension tube measures
> 43.4 mm. For general close-up work, a 25mm or 36 mm tube is quite
> good.
> Doesn't go down to 1:1, but goes further out than 1:2.
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