windpig wrote in post #12028709
I've had real good luck with lenses being spot on with focus. I have a 400mm F5.6 that I came close to selling until I got MFA with the 7D.
That's the pits with your luck on the 24LII, I hope you get it sorted out.
It's really weird actually, Its not like I have never used a fast lens before and don't know how to autofocus. Both the 17-55mm and 100mm L are at least as good on my 7D as they were on my 50D...maybe better. They require little to no MA and can pick out pretty much any target. My 35L was a nice lens on my 50D. It wasn't perfect in the AF department(unlike my 17-55 and 100L) but it did an admirable job considering how tiny the DOF could be.
With my 24mm L II it does pretty well with MA at +15. I've seen a number of weird things though...tried focusing on a frosted flakes box, it has trouble, tried focusing on the triangle "warning lights" button in a car, couldn't do it no matter how many times I tried. Tried to focus on "ROPER" manufacturer's logo on stove (white text with a blue and red line above it) missed it and focused instead on the LCD screen which was fairly far from the focus point instead each time. Just weird things like that. Never had issues like that before and it makes me very wary of using the lens. Sad considering how nice the FL is and how expensive it is. These examples may seem crazy but I don't want to use a lens on a long shoot only to get a 50% keeper rate by no fault of my own. I've taken it outside a few times and it performs ok with most targets with the MA...but again there are always a few that completely bewilder it. Here's hoping a return trip to Canon produces a miracle.
Funny thing is...on the first trip the lens came back and they said that it was performing to spec and the 7D was not performing correctly. Well I got it back and still needed +15MA. Makes me wonder how they test these lenses over there.
The siggy 30mm also needed on the order of +15MA when I tried that one. It was pretty good but I didn't like how it hunted/missed more difficult targets. If I buy one of these lenses there is a good chance it will be the goto lens in low light
As for how the first two copies of the 24L II performed...they were all over the place. If I focused on anything over a few feet away it would sometimes be dead on, sometimes frontfocus by 50%(focus at 5 ft when trying to focus at 10ft) and sometimes backfocus by 50%(focus at 15% when trying to focus at 10ft). Just completely unpredictable. Those two got sent back to the store. The third I was hopeful that it could be fixed by Canon. Now I'm just worried that BH won't let me return it and Canon can't fix it...what happens then. SOL?