On Sun, 24 Jan 1999 04:41:03 GMT, Gary Frost wrote:

[I think you may have meant to respond
to the original poster...;-]
>Another thought occured to me on your distortion problem today as I
>was looking at some distortion curves on a lens. The distortion
>varies with reproduction ratio! (makes sense...) The scale was for .05x
>to .2X ...(the lens was +- .2% depending or repro, flat at .1x ) Your
>copy stand is relatively "close-up". You might try something farther
>away for your other lens tests. Like a brick wall. I don't know how
>much or if this will help.....

This is a good point - non-simple lenses, like zooms
and lenses with CRC, may show different distortion
characteristics with focus distance...