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I took all my Nikon AI-S FF and AF DX lenses and mounted them via adapters on my 26MP Fuji sensors. They seemed fine to me. I did the same with my Olympus Zuiko lenses and they also seemed fine. The ones I was worried about were the Nikon DX lenses as I was using them for D200 10MP cameras. But, with the exception of the Zuiko 70-140 F4 zoom, they all seemed fine to me. Some of the older lenses had inferior coatings so you had to be more cautious about flair but I couldn't see any real inferiority to be honest. Now for the Nikon 28mm F/2.8 AF-D, to be fair, released around 1994/1995, it was not of very good optical quality on either Nikon FX or DX cameras at the time. It appeared inferior when I tried it, against my 35mm AI-S F/2.8 on a D200, and that 35mm f/2.8 was not that brilliant a lens either, so I didn't buy it. At the time the lens was considered worse than either the earlier 28 AI-S or even the then contemporary 28-70mm zoom. If I recall it was based on a 6 element design derived from the E series lens, of which the 28mm E series was not Nikon's finest. So to me this would have been a case of a not terribly good lens in the first place, not being very good on a 40MP sensor. I'm sure it would have been passable on the 6MP sensor, but it wasn't very good on the 10MP D200 DX one. I'm sure it was getting noticeably bad on the 16MP sensor, even worse on the 26MP one, so by the time it comes to 40MP it's probably truly awful. However, if you look at the quality of most of the current and recent Fujifilm lenses, they are generally starting at a much higher quality baseline, so I still think jumping from 26MP to 40MP is not going to make them look significantly inferior. OK, some might look better wide open than others if pixel peeping, but I personally wouldn't bother rushing out to replace anything Fujifilm that I think looks good on the 26MP sensors on a 40MP one. Other brands, especially third party ones, might be a bit iffy, but the Fujifilm glass in general is pretty good at 26MP and therefore I think will handle 40MP without too much trouble. I'll guess I'll see if and when I get a Fujifilm 40MP body whether this holds up, but I'm not going to not buy a Fujifilm lens that's not on "the list" in the meantime ,for fear it is going to look bad on the 40MP sensor in the future.