canon 180mm L or 100mm L

hello every one
i bought canon 100mm L one year ago and a 180mm L about 2 weeks ago
i compared them and suddenly i see that 100mm L is a little sharper than 180mmL ! is that right ?
I decided to sell 100mm L but now i can't make a decision !!!
my body is canon 60D

Stop pixel peeping and just keep the lens that's the most useful to you...

I don't see the advantage of the 100mm, anyway, looking at your sample shots. Both look very sharp.

Or keep both... they serve different purposes.

I have both (along with a couple other macro lenses).

On a crop camera, 180mm is a very long macro lens... more difficult to hold steady, which is just compounded when you need to stop it down more to get any depth of field at all. I mostly use the 180mm on a full frame camera.

The difference in sharpness you think you are seeing might just be camera shake causing slight image softness, more-so with the 180mm since it's so much harder to keep rock steady. Even the slap of the mirror in the camera can cause enough vibration to effect images shot with the 180mm at high magnification.

I use my 100/2.8 USM (not the L, I simply can't justify the extra cost just for IS) on both full frame and crop. It's a lot more handholdable, faster focusing, more "dual purpose".

amfoto1 wrote in post #15695446
Stop pixel peeping and just keep the lens that's the most useful to you...

For even sharper images, perhaps a Leica or Carl Zeiss macro will fit the bill. but not my wallet.

Sigma 150mm is an excellent lense as well

tri911 wrote in post #15700958
Sigma 150mm is an excellent lense as well

+1 for the Siggy 150mm even in old version!

Titi

I owned the 180L for a short time, and I found it slow to focus (when it had to hunt through the whole range) and heavy... it was great at being a macro lens, not so good at being anything else...

i'm agree with you about focus and weight ! i believe that this lens in only for macro photography and in macro work you need to use manual focus but 100mm L can be a good portrait lens with better focus time and weight in compare with 180mm
thank you all to answer my question i decided to keep both lens ...