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Canon EF 100-400mm f/4.5-5.6L IS USM

ef100_400l_1_
Review Date: Oct 19, 2008 Recommend? yes | Price paid: Not Indicated | Rating: 8 

Pros: Range, stabilization, build quality
Cons:
Watch out with UV filters

Ive had the lens for a month now and was using it with a UV filter attached to prevent possible damage to the front element.
I bought the lens for the extra range it would give as an addition to the 70-200 I have.

Was about to return the lens as all pictures seemed out of focus. With the 50D results seem to become better with a backwards adjustment of +20. However, quality was not close to the 70-200 F4 IS I have. Before bringing it to the shop, I repeated testshots I made earlier for the micro adjustments, but now without the UV filter, and the lens now produced sharp images.

After further test shots (birds, buildings etc.) I am very happy with the lens. Lens is build like a tank, and the push pull system is very easy to get used to.