In researching a prime 85mm lens, I came across the f1.8D. I tried to find out a bit about "rear focus" feature but what I dug up had little to do with what Nikon are promoting. It's supposed to enable fast AF operation which may be ironic as "rear focus" apparently relates to the inaccuracy of AF systems. Hmmm. Any ideas please? (Thanks in advance!)
Thats some funky language you found. Can you post a link to it? I understand it the same as you, misfocused. It would make more sense on a 105 or 135dc which you can control with way your depth of field falls.
Don't confuse focus problems "front focus" and "back focus" with the lens feature "rear focus." Check out the link below to get a definition of the Nikon lens terms - scroll about half way down to find Rear Focusing: http://imaging.nikon.com/lineup/lens/glossary.htm
The term "rear focusing" is just telling you which of the glass elements in the lens move to alter focus distance - specifically, it's those towards the mount end. This means that the lens doesn't get longer or shorter, and the front element doesn't rotate - useful for using polarising filters
Had the chance to "compare" it against the G version and, besides the focus speed, which was a "micro" second fast in the G, the image quality is about the same. I will use it for sports with no concerns at all.
The only lenses that are a really upgrade, for me, are the 85 1.4G/D.
Nikonians!!! My best investment made after my camera!!!