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Canon EF 70-300mm f/4-5.6 IS USM

70-300_isusm
Review Date: May 28, 2006 Recommend? yes | Price paid: Not Indicated | Rating: 8 

 
Pros: Range! (112-480mm on my 20D), Overall sharpness, IS, Weight, Focus speed, Neutral image color, Bokeh
Cons:
Build quality (rotating frontlens when focussing, tube extention at >200mm), Sharpness below f8 is not great.

In addition to the long list of positive reviews.......

I recently bought this lens and I am overall very pleased with it! However, there appears to be a serious issue with some (or all) lens copies when pictures are taken in the vertical orientation. Personally I did not notice any problems with my copy. Still, I thought it was important to mention that Canon has posted a service notice:

http://www.usa.canon.com/consumer/controller?act=PgComSmModDisplayAct&keycode=2112&fcategoryid=216&modelid=11922