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Photography Question 
Greg S. Timm

Canon 5D compatible, Sigma Lenses.

I've been comparing the Sigma 170-500mm DG lens with the Sigma 50-500mm EX APO RF lens. Which one is compatible with the Canon 5D? If both, which one would be the preferred choice and why? Thanks, Greg

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12/22/2006 8:05:25 PM

Jon Close
BetterPhoto Member Since: 5/18/2000
  Both are compatible, so long as they are made for the Canon mount. ;-) I don't have a preference. Despite the 10x zoom range, the 50-500 is reputed to be very marginally sharper at the frame edges, but I doubt you'd see a difference side-by-side. Otherwise the major difference is the 50-500 has HSM (HyperSonic Motor) which is similar to Canon's USM, and gets EX finish.

The 50-500 is designed to work with Sigma's own teleconverters (and possibly Canon's). These teleconverters have an extended front elemement that nests into the back of compatible lenses. However, Tamron and Kenko make very good TCs that would work with the 170-500.

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12/23/2006 5:10:01 AM

Jason R. Fortenbacher
BetterPhoto Member Since: 9/11/2006
  I have the Sigma 50-500mm and absolutly adore that lens! It is incredibly sharp, and the focusing is also extremely fast and precise. I use it for aviation photography and the lense easily keeps up with jets coming straight at me at near the speed of sound.

Every photo in my gallery was taken with this lens.

With regard to the zoom range alone (not even counting sharpness and focus speed) this lens is worth its weight in gold. It is so great being able to back off to the 50mm end!

I just can't say enough good things about this lens!

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1/8/2007 2:43:16 PM

Christopher A. Vedros
BetterPhoto Member Since: 3/14/2005
  For the small difference in price, the 50-500mm seems like the clear choice to me.

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1/9/2007 9:01:07 AM

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