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Difference?

What is the difference between these two lenses, besides their maximum aperture? Is the 100 mm macro just able to focus at a shorter lens-subject distance?

Canon EF 100mm f/2 USM Telephoto
Canon EF 100mm f/2.8 Macro USM

I currently have the latter lens, and I love it. Almost as much as my 50 mm :)
 
Speed and use.

The f/2 lens is a speed demon compared to the f/2.8. The macro lens is made for macro so the working distance is totally different.

Lens is similar to each other in regards to focal length, but totally different uses. It's like comparing the 50mm f/1.2L vs. the 50mm f/2.8 macro...
 
Also:

http://www.luminous-landscape.com/tutorials/understanding-series/understanding-mtf.shtml

then check out their plots
100mm macro f2.8
ef_100_28mtf.gif

100mm f2
ef_100_2mtf.gif
 
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