    
Jan Dvorak
Rating: N/A
Votes: 0 | | Posted on Tuesday, July 04, 2006 - 11:03 am: | |
Harlee,
Is the lens focusing 'past' infinity, or does it not reach infinity? If focusing past infinity, it might be that the lens was designed to allow for heat expansion, which might affect focus. I have seen this on many Canon lenses and notice it also on my Leica 280mm Telyt.
Another thing - is the focusing discrepancy the same at all zoom settings? What are you using as your 'infinity' reference? Particularly at the 210mm setting infinity has to be real infinity and not a house across the street. For accurate checking specially with long lenses your subject has to be at leat 500 meters away; I prefer to use the moon if weather permits ;-) .....
Also bear in mind that adjusting the infinity setting on a zoom lens tends to be a little more complicated than on a prime lens. Stuart's last paragraph is an indication of what you might run into.
Good luck,
Jan |