Well I have been considering adding a good 50mm prime to my lens kit, mostly for inside shots and closer work. I was going for the canon 50mm f1.4, since whilst I don't tend to do any true dark photography where I would want f1.4 I am after something with more guts than the f1.8 version. However I recently saw some shots with the canon EFS 60mm macro and it got me thinking that a short range macro lens would have its advantages. Adding macro, which is a definite addiction of mine - and also allows for a greater depth of field for a given aperture when compared to a longer focal length. Although I do lose a lot of working distance I think that as I practice more this will be less of a loss when I compare it to the gain in depth of field. However I wonder how the sigma 50mm macro works in general as a 50mm lens - which is where I think it will see the most use. As its a macro lens is its af up to speed - does it perform over longer ranges and still retain its quality of image at the end?