43mm @ 1.9, no focus correction:
24mm @ 2.0, no focus correction:
24mm @ 2.0, focus correction enabled and set to +7 for this lens:
24mm @ 2.0, focus correction set to +10:
Crops of the three 24 shots, off, +7, then +10:
And I'll tell you, I walked around a little earlier and it's field relevant - without the adjustment, I'm pretty consistently behind my subject:
(focus confirmation was for the foreground leaves.
The Coke cans shots could just be movement after focus, those look like handheld shots. Are they?
ReplyDeleteThe leaves are pretty bad. But... Since it looks like it is handheld, it could be pullback. I know I have a tendency to lean back a little after focusing, something I noticed doing lots of macro. I think it is an inhalation exhalation issue.
It isn't soft enough that I would complain about that, but it does look to be focusing odd. It was correctable with compensation, but you were bumping up to the max correction.
I'd consider, if those were handheld, putting it on a tripod and double checking. I think you have a focus issue, but the back focus correction *could* disguise hand movement either on focus breathing or some other post focus movement. If that isn't it, I'd probably send it back for replacement, or return.
Oh... You were focusing on the front can? If so, ouch....
ReplyDeleteYeah, focusing on the front can. Admittely this is all handheld, but I don't tend to move front to back that much and you can see I got pretty good sharpness with the 43, which should show front/back better.
ReplyDeleteYou'll see the other shot in a minute, I'm thinking this sat in the sun or something, there's no reason it should be acting this bad for being the premier line.
that looks....freakishly bad. i mean, sure, on my rangefinders i can see where front or back focusing can happen, but an SLR? if this only what the autofocus does with the lens, ie, does it all work out fine and give you the same in-focus field on a shot as you see through the viewfinder?
ReplyDeletei suppose i get where the camera could have the wrong idea what to do with the lens when you let it focus, yeah..... still tho, that's stupid far off. this should have much more room for error than the 43/1.9, looks like just bad input or decision-making logic on the cameras part
-GMT
I think that non-USM/HSM/whatever lenses incorporate a position sensor. My guess is that this lens was either off from the factory, or more likely got knocked around in use. That is probably why it went for sale, and it doesn't speak well for KEH, since I was under the impression they at least checked the darn things in making the rating. Then again, the shipping process could have done it, too.
ReplyDeleteI've never understood how back focus occurs on only one lens (but it almost always does) since the AF elements are BEHIND the lens, and shouldn't indicate focus if the focus is wrong.