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  Reviews by: dbehrens  
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Canon EF 28-70mm f/2.8L USM

ef_28-70_28s_1_
Review Date: Aug 16, 2010 Recommend? yes | Price paid: $750.00 | Rating: 10 

 
Pros: A pro lens. Fast and sharp! ...from corner to corner. No CA or flare.
Cons:
None

I've had two of these lens and both are very sharp - even wide open. Its every bit as sharp as my Canon 50mm f/2.5 compact macro (and with the same macro capability).

Although only 28mm wide this coupled with a wide zoom (for me a 15-30 Sigma) and a long zoom (for me a 100-400) makes an awesome 2 or 3 lens arsenal.
 
Sigma 15-30mm f3.5-4.5 EX Aspherical DG DF

15_30f35_45_1_
Review Date: Aug 11, 2010 Recommend? yes | Price paid: Not Indicated | Rating: 8 

 
Pros: Wide. Sharper than my Canon 17-35L - especially in the corners.
Cons:
Difficult to use with filters. Flares horribly - even in the slightest direct light.

The positive of this lens is that it is sharp. I would say almost as sharp as the 16-35 Mk II. However, its Achilles heel is that it is intolerant of direct light. Even the slightest direct light creates purple flares. Having said that - I still have the lens and will keep it until I find something that's on par with the Nikon 14-24 f/2.8. I currently use this with the 1Ds Mk2, 5D and 1D Mk4.