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Canon EF 24-70mm f/2.8L USM

ef_24-70_28u_1_
Review Date: Oct 30, 2008 Recommend? yes | Price paid: Not Indicated | Rating: 10 

 
Pros: Image quality. Lens speed. Versatility. Ergonomics.
Cons:
Price! Fragile plastic lens hood!

My copy of the 24-70mm 2.8 L turned out to be everything it has been praised for. This lens used on a 1Ds MK II at full 2.8 aperture is sharp and sharp at all focal lengths and at 70mm my copy is crazy sharp. I love this lens! If this lens had IS it would be damn near the ultimate lens. Interestingly it's size and weight makes it great for steady hand holding at low shutter speeds. I have had no problem getting sharp images with this lens using f/2.8 at 1/15 sec. The only negative is the lens hood is fragile rinky-dink plastic but this is a drawback on all Canon L lenses.

 
Sigma 14mm f2.8 EX Aspherical

14mmEXhsm_1_
Review Date: Nov 9, 2006 Recommend? | Price paid: Not Indicated

 
Pros: Image quality, build quality, unique perspective, price.
Cons:
None.

I bought this lens years ago thinking it's extremely wide perspective would add spice to my stock photo imagery, and it has! This lens is one of Sigma's success stories, a beautifully constructed optic with extremely high image quality for considerably less money than Canon's L version of the this lens. Despite what some critics of this lens have said this lens works wonderfully at full aperture on full frame cameras, and when focused close-up on subjects at full aperture it imparts a unique "Bokeh".

 
Sigma 14mm f2.8 EX Aspherical

14mmEXhsm_1_
Review Date: Nov 9, 2006 Recommend? yes | Price paid: Not Indicated | Rating: 10 

 
Pros: My copy of the Sigma 14mm f/2.8 Aspheric lens is great! This puppy is built beautifully and focuses with speed and alacrity. Having used it with both full frame film and digital cameras I've found this len's image quality outstanding from it's F/2.8 full aperture till the diffraction limitation of it's smallest apertures which is an inherent flaw in practically any lens. But my Sigma 14mm f/2.8 Aspheric rocks big time at full aperture and with a unique Bokeh when focused on close up subjects. Is canon's L version better? Not in my experience, plus the Sigma is considerably less expensive. This is clearly one of Sigma's success's. If you need or desire a 14mm superwide for Canon mount then this is the one!
Cons:
Honestly, as extreme focal length lenses go I see no negatives.