At 1:1, the distance from the focal plane to the subject is 4 x focal
length, or 340mm Since the front of the lens is 90mm from the focal plane
when focused at infinity, and another 85mm at 1:1, 340-85-90=175mm, or
about 7 inches from the subject to the front lens surface.
The 100/2.8 should have a slightly larger working distance, perhaps 1.2" /
30mm more?
Tom
On Wednesday, February 06, 2002 at 12:01, David Lee
<olympus@xxxxxxxxxxxxxxx>
wrote re "[OM] Zuiko 85mm f2.0 data" saying:
> I'm considering investing in an 85mm f2.0 which, amongst other things,
> I'd like to use on my bellows for close-up work. Does anyone know the
> location of the front nodal plane of this lens relative to the front of
> the lens barrel or alternatively the amount of working distance at 1x
> magnification? I've tried estimating it from published lens data but the
> results seem optimistically large - like a working distance of about 9
> inches at 1:1. This is rather larger than the 100mm f2.8 that I'm using
> at the moment so I suspect that either I may have miscalculated or else
> the data may not have been correct.
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tOM Trottier, ICQ:57647974 http://abacurial.com
758 Albert St, Ottawa ON Canada K1R 7V8
+1 613 860-6633 fax:231-6115 N45.412 W75.714
"The moment one gives close attention to anything,
even a blade of grass, it becomes a mysterious,
awesome, indescribably magnificent world in itself --
Henry Miller, 1891-1980
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