In article <849009484.13588@dejanews.com>, teeg@worldnet.att.net says...

>My lens will focus to INF at 50mm, but at 28mm it will be off INF
>somewhat when focusing. Is this the nature of zoom lenses or just these
>elements ? The camera used is a Nikon N70.

Nikkor zooms commonly do not hit infinity focus exactly at the mark,
or stay exactly in focus when zoomed. They should all allow correct
infinity focus, though, throughout the zoom range.
Hope This Helps