Hi--

>David,
>I have a 135mm f/2.8 lens that I had AI'ed early this year. A couple of weeks
>ago, I was shooting a scene and switched from the 135 to something wider. I
>was using aperature priority in both cases. I was surprised to see that the
>shutter speed differed by about 2/3 of a stop when I used the same aperature on
>both lenses. I realize that changing lenses changes what's in the weighted
>part of the meter, but I was surprised at the difference. I tried comparing
>the notch on the AI'ed lens with my other lenses (one AIS and a couple AF-Ds),
>but the notches seemed to be different. Can you tell me how to verify if the
>notch was cut correctly? I assume the edge of the notch that is near the
>f-stop indications is the important one since that's the one that seems to come
>into contact with the lever on the body. Which f-stop should it line up with?
> Danny Levenson

The important surface placement is the one the body tab contacts, and
the position is the same on all same-speed lenses, so compare it with
another f2.8 (or one stop over, with an f4 or f2) - it should be the
same, if correctly cut.
David Ruether