Focal length does not affect depth-of-field only subject magnification
and aperture affect depth of field. If you use the same aperture, and
the subject is the same size using either lens, the depth-of-field will
be the same. The perspective will be different (because the shooting
distance is different).
Remember that the 10D is a 1.6X camera, so the 100mm will behave like a
160mm and the 180mm will behave like a 288mm. Though this will NOT
affect depth-of-field.
Mr. Bill
Tom Christiansen wrote:
Probably an oldie but goldie, but here goes:
I used to have a 100 mm macro lens for my Contax system and am
considering getting something similar for my 10D. I'm somewhat torn
between the 100/2.8 macro and the 180/3.5 macro. I'm aware of the
obvious tradeoff regarding price.
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