If you have an AF-s 14-24mm F/2.8 G ED lens, please answer this question.

I'm in the end stages of repairing one of these lenses. I got the right parts to do it, with no small amount of difficulty.

I've never really had a chance to work with one that didn't need repair so hence this question:

When operating the focus, does the front glass move in and out?

Or the zoom, for that matter?

I'm asking because there's something about the front section of the lens that isn't really making a lot of sense to me yet. There is what I would presume is a provision for the front lens to move and focus, but if that's the case then I'm either missing something about how it goes together or I'm missing one or more parts.

Knowing if the front glass moves, and under what conditions, would be very helpful.

I'm reasonably sure (now) that the front glass moves as part of the zoom mechanism. Because that's working but not completely. So specifically, when you zoom, does the front glass also rotate? I'm guessing the answer should be no. Currently mine rotates through a short arc and I need to figure out what's allowing that to happen.

The glass does not rotate under any conditions.

And the glass does not move in and out when focusing, only when zooming.

Hope this helps.

Cheers, Don

I got it figured out and corrected the assembly error. Although the zoom is tight and I will have to go in there and do some gunsmithing on the parts to make them run smoothly (or is that "lenssmithing"?) the lens now works well.

I expected to have to make some adjustments anyway. It was dropped and the front glass assembly was completely out of the lens body. A few hours spent making some "adjustments" should make it run as smooth as a new lens.

It's done. I went in and did the "gunsmith" adjustments this evening, and now everything works perfectly. Zoom is a bit on the tight side but I actually prefer a zoom that doesn't readjust itself from the weight of the glass pulling on it.

I LIKE this lens!

I have now checked autofocus using a focus chart laid on a table, and photographed it from an oblique angle, to determine that the lens had a back focus bias to it.

I corrected it out in the AF fine tune submenu, and now it's so sharp it's ridiculous. I am IMPRESSED.