In article <5l8795$2uq@horton.research.canon.com.au>, graeme@research.canon.com.au says...

>I recently purchased the Nikkor 24-120mm zoom lense. In the instruction
>leaflet it says for pinpoint accuracy focus to the 50mm length then zoom
>to the required focal length. Is this the best way to do it? I've always
>understood that the focusing distance changes as you zoom in and out.
>I also notice that when I focus at 50mm and then zoom out to 120mm the
>image looks blurry and the camera itself does refocus, so I
>don't understand why Nikon makes this recommendation. Any comments??

Yes - the idiotic advice (to focus at the longest FL, then zoom) appears
to persist in a variation...? Most Nikkor zooms are slightly vari-focal
(they change focus with FL change), making the advice in the instructions
inappropriate... Focus at the FL you are going to use.
"Hope This Helps", "Bob Neuman", David Ruether