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Sigma 150-500mm f/5-6.3 AF APO DG OS

150-500
Review Date: Jun 29, 2009 Recommend? yes | Price paid: $850.00 | Rating: 6 

 
Pros: Very Nice Build Quality Image Stabilization Appears to Work Well Discount relative to Canon's 100-400 f4L Zoom mechanism is a rotating ring, rather than push-pull
Cons:
Starts at f5.6 Soft due to apparent coma, even stopped down

I bought this lens based on several reviews suggesting that I might be able to get a reasonably good copy that would be roughly as good as a good copy of Canon's 100-400 dust buster. Unfortunately, the copy I received just didn't cut it. Nothing was critically sharp and there were subtle halos surrounding the sharpest features.
It went back in trade for a new Canon 100-400, at a lot more money, but the Canon is beautifully sharp even at the longest focal lengths. The 100-400 is even sharper than by 300 f4L at 300mm!
Sorry, Sigma, I really tried hard to give you some business. I suspect there are some copies that are very good, however.


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

ef100_400l_1_
Review Date: Jun 29, 2009 Recommend? yes | Price paid: $1,399.00 | Rating: 10 

 
Pros: Sharper than my 300 f4L Works well with a 1.4X TC from 1 stop down to about 3 stops down Balances fairly well with a 5D Mark II
Cons:
Heavy after a little while and physically long at 400mm Should be priced a bit less expensive at this point in its product life