On Sun, 13 Dec 1998 21:47:15 GMT, danksta@ns.sympatico.ca (Terry Danks) wrote:
>On Sun, 13 Dec 1998 00:55:05 -0800, Andreas.Nicklass@usa.net (Andreas
>Nicklass) wrote:

>>Theoretically there is indeed a focus shift, when you put a filter
>>in front of your lens. I heard from several guys who actually ob-
>>served this effect with long focal length lenses.

>Absolutely unmistakable when the drop-in filter is removed from
>an 800mm IF-ED Nikkor. The focus changes! No doubt about it.
>Dunno if that is at all relevant to this particular thread though...

Ah, yes, but no focus shift with a front filter (or at least
none that is detectable on film by ordinary mortals...;-).