On Fri, 11 Sep 1998 08:51:32 GMT, "toby" wrote:

>I have a very early one, AI converted. It has a lot of "snap" and the colors
>are saturated and clean. Very sharp, although I have noticed that it doesn't
>have great field flatness--the extreme edges focus at a different plane than
>the center. It can easily be seen if you focus on an object and then move
>the object to the corner of the frame (expecially if you have one of the F
>series cameras which shows 100% of the frame in the finder.)

Ummm, with wide-angles, this effect can be quite pronounced if
the focus distance is close, with flat-field lenses... (You
are rotating the field, so the focus distance off center SHOULD
be different...! ;-) Try it again with a near-infinity subject...;-)
BTW, the F/F2/F3 VF's are excellent for checking focus problems
in the corners since they are sharp enough, and the focus is
correct - things which are unfortunately not true of most new camera
viewfinders...