On Mar, 3 feb 1998 14:26, Thomas H. Hogan <mailto:flzhgn@xxxxxxxxxxxxx>
wrote:
>Although it does not have an Infrared Focus Mark my pictures
>turn out with correct focus using an opaque IR filter (#87) behind
>the lens but in front of the shutter in an OM1n.
>
Nor have the other 35-70. In a test made by an Italian magazine, I found
the f/4 to be *very* corrected as chromatic aberration. Blue-green light
(500 nm) meets exactly the red (650 nm) value (at 50mm of focal lenght).
Marco
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