Nap: When I shopped for my new 20d rig, I struggled with the 60mm efs vs 100mm macro debate. I assumed, as you do, that the 60mm efs would be a pure 60mm on the 20d because the "s" series lenses were designed for the 22.5x15mm sensor. My friend at my professional camera shop assured me I was wrong and that you have to apply the 1.6 mag factor to the 60 giving it an effective focal length of 96mm. I checked the Canon website and it looks like he was right.
CLICK HERE.
David: I bought the 60mm because, in my Nikonos Neanderthal days, I used the close up kit a lot for close in (not macro) fish shots. I figured the 60 would work better than the 100 for this purpose. So far I am very pleased with the 60 in a close up role, but do not own the 100 so I cant compare.
Alcina: As I think you own both lenses, have you calculated the "stand off" distance for the 60 and 100? In other words, if you are shooting 1:1 how much closer do you have to be to the subject with the 60 to reach the inside and outside focal planes ... say at f16 or f22? You could do a land test and then figure in the 25% uw magnification factor.
Also, with moving subjects (in good light) I find the 60 tends to go hunting, usually when I am about to snap the shot. I get my best results in one shot and using CF4 in mode 3 so the thumb control handles the focus set. I have had spotty luck with ai servo. Do you notice a difference between lenses on the ability to maintain focus on a moving subject?
KevReid: You can throw in your comments any time now.
---Bob