Hi guys. I’ve been thinking about moving from the 100 Macro to 60 Macro for a few reason. Tell me if I’ve got it right please.
First of all, I’m not big on shooting insects at all. The reason why I wanted a macro lens is to be able to do ultra sharp detail shots of leafs and such, object and also portraits. Now, the 100 Macro works very well for all that BUT it is a little long on my 40D.
One thing I read was (and I don’t fully understand the mechanics of it although I get it) that with the 60 macro, you can get more of the subject in focus at the same aperture and distance than the 100 Macro. Is this correct?
Another thing, which hasn’t been mentioned much when people try to pick between these two lenses is that with the 100 Macro, I have to be at 1/160 shutter speed minimum to avoid blur. In the sun, that’s easy but as soon as you walk into a shade, you can kiss ISO100 good buy. On the other hand, with the 60 Macro, 1/60 sec shutter is okay and that is a big difference. Am I right to think this way?
Sharpness seems to be equal between the two. In fact, Photozone shows the 60 macro to be a little sharper in the center but the 100 Macro has sharper borders. Color and contrast are about the same also.
I’m not planning on moving to FF any time soon. I like my 40D quite a bit. So for someone who isn’t into shooting insects and uses the macro lens for portraits, close up detail shots, wouldn’t the 60 Macro be a better choice? Is there something else that I’ll be giving up if I do the switch? I may be missing something …
) so at 2 feet you're using your 100mm/60mm lens like pretty much any other lens. 
