Quote Originally Posted by ltilley
I have the 100-300mm EF lens which I used to use with my Elan IIe 35mm, which also works with my digital rebel just fine. I have yet to have any problems focusing, etc. I'd be interested to hear what you find out.

Have you called Canon? They have alsways been willing to answer my questions.

Lisa
I just got off the phone with Canon and he me told to send it out to service. He couldn't give me a straight answer probably because he didn't have one. Mentioned a possible need for calibration?

It's strange:
I tried it on my DREBEL and it was fuzzy without getting a focus
Used it on my 30D right after and it seemed fine
Brought it to the park the next day with my 30D and then acted just like it did on my DREBEL
Put it on my old A2 and it was fine.

I should just mail it out now. Will post the results.