I have this lens which I purchased with my 5D. It is an incredibly good performer. It never fails to please me every time I use it. There seems to be no limit to the amount of enlargement the images will stand. Of course there is a limit, but it will easily produce 24 x 16 enlargements with crop factor of 1. Focusing is fast and accurate and the IS works well. I think it was money well spent. Perhaps I should add that I use a 20D body for use with bird photography. This is because even with a 400 mm focal length I never fill the frame and under these circumstances the 1.6 crop factor allows more pixels to be used.
Last edited by John; 01-03-07 at 08:29.
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