Canon 50mm shootout

Some people here also say the 1.4 has faster AF.
I really think it depends on the camera body.

The 50 1.8 ain't bad uhh

ummm...has anyone else noticed the results at photozone.de ?

http://www.photozone.d​e …72-canon_50_12_5d?start=1

http://www.photozone.d​e …15-canon_50_18_ff?start=1

Azi wrote in post #9538098
Some people here also say the 1.4 has faster AF.
I really think it depends on the camera body.

Actually that is probubly true, Much like the 85mm f/1.8 is faster than the 85mm f/1.2, its because the size of the glass its moving is greater, thus its a lot slower to focus

Also f/1.2 is marginally harder to get accurate focus on, so its probubly sacrificing speed for accuracy

KenjiS wrote in post #9564319
Actually that is probubly true, Much like the 85mm f/1.8 is faster than the 85mm f/1.2, its because the size of the glass its moving is greater, thus its a lot slower to focus

dkspook wrote in post #9534019
The 400mm F/2.8 has more glass to move than pretty much any other Canon lens, yet has blazingly fast AF.

KenjiS wrote in post #9564319
Also f/1.2 is marginally harder to get accurate focus on, so its probubly sacrificing speed for accuracy

I think the accuracy > speed argument is the main reason. Although I personally find the 50L to focus faster than the 50 1.4, I haven't scientifically tested it. But I have an idea about how one could perform such a test... using a model railroad, a tripod, a 1D mk III and a wireless remote trigger. All I need is the time to do the test. And a model railroad.

dkspook wrote in post #9534019
The 400mm F/2.8 has more glass to move than pretty much any other Canon lens, yet has blazingly fast AF.

See i thought that at one time too but someone pointed out that the actual -focusing- group in most of the super teles is a very small tiny and lightweight section of the lens

Theres gotta be more to it though..