ScubaDuc said:
I am already alienated just by the thought of Nikon changing its mount 😱
Note that nobody has spoken directly to expand on this rumor. To me that says a lot.
If Nikon changes their mount, it will be compared to Canon's switch in 1989. The history behind the Canon switch may give comfort or cause angst among the Nikon faithful.
Canon and the FD mount was quite an accomplishment. The breech lock would never wear down compared to bayonet mounts. The aperture mount area was larger, and faster lenses were possible. With the dawn of AF looming large, they looked hard and fast - and felt that the FD mount could not meet the demands of the future, given the technology of the time.
That brought us the EOS mount. The argument of breech vs. bayonet was great for ad copy, but seemed not to hold water in actual use, even with the pros. Yes the breech mount of the FD could be stronger than the bayonet (witnessed by countless Canon reps putting a Canon FTb body on the floor and standing full force on the 50mm lens attached. Nikon reps were too timid to try the same with the Nikon FM. So the myth was born and supported).
But the EOS mount expanded on the aperture area size for even faster lenses. But Canon also brought the first motors to be used in AF lenses because of the switch. It would be many years (IIRC) before Nikon could do the same. The switch in the mount also allowed for the first time for information to be fed from the lens to the camera body, for the entire lens line. This is now the backbone for Olympus and their E system mount (using their RAW conversion software, one can correct for vignetting issues, and for Olympus in the future correct automatically for distortion issues).
For Nikon a switch in mounts would need to show a major advantage that can not be overcome in the current mount. What that is I am not sure.
Some Nikonians point to the longevity of the Nikon F mount. But that is clouded in hiccups along the way. The original Nikon F mount used a lug (that connected to prong on the meter head) that communicated aperture info to the meter. That gave way to the Nikon AI mount (1977) that had the lug and its equivalent machined into the aperture ring.
The original Nikon F mount lenses needed to modified, or milled down so they would mount on the new AI bodies. Then in 1981 Nikon introduced the AI-S mount (auto index shutter). Though the first camera to take advantage of this mount would not appear till 1983 with the Nikon FA.
From Cameraquest:
AIS lenses also have 1) a little indentation in the stainless steel lens mount to indicate that a lens with a linear action diaphragm was mounted. This feature was originally used on the FA/FG/2020/2000. No current production Nikon camera uses this information. 2) internal modifications to allow AIS lenses faster and more accurate shutter priority and programmed exposures by way of linear aperture movement, i.e. an equal mount of movement anywhere along the linkage results in the same amount of diaphragm action.
There were a few special lenses made for the Nikon F3AF that are not really important to the current lens mount discussion.
Then we have the current AF mount (and its close cousin, the AI-P manual focus mount). This allowed for AF to be built in the body, as opposed to the AF being in the lenses like the AF lenses for the F3AF. The first generation was updated to provide distance information with the AF-D mount.
In between we had the Nikon IX mount. These lenses were designed sepcifically for the APS SLR, They reached deeper in to the mirror chamber, so they could not be used on non APS cameras (surprisingly to some Canon many years later took the same tack in doing EFS lenses for the 1.6x crop factor cameras. Such designs allow for smaller lenses).
Getting a little long here. But Nikon started to produce camera bodies that would only take AF, AF-D, and AI-P lenses. For these lenses on these specific bodies took aperture control away from the aperture ring; and gave that control to command rings on the body itself. That gave Nikon the idea of going with the AF G series lenses that got rid of the aperture ring all together, like Canon did 1989.
The point being is that Nikon deserves much credit for "milking" their original mount for as long as they have. With caution it is possible to use older lenses on newer bodies. But it goes a bit far to say that Nikon has not changed their mount.
If I ever fully switch to digital, when Nikon comes out with a native 24x36 CCD, I want to be able to use my old lenses. I got too much invested already plus I don't see all the excitment with such long range zoom lenses: Zooms have never been as good as their fixed counterparts, even though with the 1.5 factor only the center of the lens is used: This is some of what I have collected through more than 20 yrs of amatour photography....and I LOVE my old Nikkor lenses...How could they even consider thinking about changing the lens mount....😡
The state of CCD and CMOS technology is that you have small wells that need to be filled with light. 35mm lenses fill these cells at oblique angles. That causes CA, soft focus, and other issues. Because 1.3x, 1.5x, and 1.6x sensors take the sweet spot of a 35mm lens, this is not normally a big issue.
Some Canon people have stated that with the Canon EOS 5D, it is time for digitally specific lenses. These would more clearly focus the light rays straight into the seniors light wells. What is surprising some of these same people said that Olympus was full of it when they mentioned digital specific lens designs.