> I don't remember exactly, but when I bought my 100/2.8 Macro USM, I
> looked into these same questions. I believe that the non-USM
version's
> working distance was about 4.2 or 4.5 inches, quite a bit less than
the
> USM version. Also, this figure must be measured from the filter
ring
> rather than the front element, because the front element is recessed
in
> the non USM version I believe.
>
> I think the working distance figure for the old one was listed at
canon
> USA's web site, but it may have been removed since.
Some personal measurements ...
The old Canon macro: my best estimate for F at 1:1 was 73mm.
At 1:1
distance to film plane approx 307mm
working distance (to front of lens) approx 112mm (4.5 inches)
and no, the recessed lens means that addtional lens hood were seldom
needed..
More info I have, but it is at work ....
Bob
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