One of my relatively unused lenses is a 50mm f1.8 that I bought for cheap off an ex-colleague some years ago. The lens is a little on the long side for a crop sensor body like my old D300 and the D7000 I use now. Even if not, I discovered that the lens had front-focus issues – funnily despite that ex-colleague’s assurance then that it was tack sharp LOL – so the lens was left in the dry cabinet for quite a while.
I finally got round to trying to correct the focusing issues on this lens using the AF fine-tune feature on the D7000. Here’s what it looked like before the correction. Resized source image first:
100% crops next. Both were shot at f1.8; the first one before the correction, and the second after:
Look hard enough and you’ll see what I mean; the furry texture in the second picture is better resolved than the first. Nifty little feature on Nikon DSLRs.=)
I shudder to think about the fact that most if not all my current lenses would benefit from this feature.
woah…. can really see the difference. Should try this one day
It might not be just the lens, bud, but also the body itself. The couple of times I sent my Sigma lenses to the service center for calibration, the old D300 accompanied it each time – so the calibration done on the lens was to match the nuances of the DSLR.
The great thing about this AF fine-tune feature though is that I can (hopefully!) correct most back/front focus issues on my own and without having to make trips down to the service center.=)