tkbslc wrote in post #9338202
I would say it matters MORE. When you only have 3-4 inches of working room and your lens extends 2-3 inches, you risk clearance issues with your subjects - especially if you use a hood or ring light.
I would like to disagree. When I do macro, I care more about the magnification so my focus is fixed, I move the camera to focus. I am pretty sure most macro photographers do the same. USM, autofocus, all that stuff is wasted on a macro lens. Most folks just set the magnification and move the camera. I also never used a hood, I doubt many macro photographers do as it gets in the way of light. Ring lights are fine (but again, jsut a regular flash thats bracket off of camera works PLENTY well, something specialized like a ring light is wasted IMO), but even at 1:1 on a 100mm lens, you have a good couple of inches.
OP> I'll be honest, I think too many folks are Canon obsessed. Third party lenses are plenty good. Spend some time in the macro section of the forums and you will find this out very quickly.
Here is a link to the macro discussion section: http://photography-on-the.net/forum/forumdisplay.php?f=123