Quote Originally Posted by bburns223
the 135 f/2 is more of a good idea on a fullframe body because an 85mm lens gives the same focal length and wider apertures at lower costs

...unless, of course, you really need/want the ~200mm focal length and a wider aperture (at lower cost than, say, the 200mm f/2L). Bryan mentions that the 200mm f/2L is a great portrait lens. On a crop body, the 135mm f/2L is as close as you're going to get to that aperture at that focal length.


I think it all comes down to the focal length you need, then getting the widest aperture you can (or at least, can afford!) at that focal length.