Thanks for the great informative reply. Your AI vs. AIS description makes sense. A few clarifications -
My 55mm f/3.5 does have the small aperture marking (in white) and the rounded rabbit ears with holes. What it doesn't have is the indentation on the mounting plate on the back side of the lens, which my 300mm does have. Maybe that indentation isn't indicative at all. Maybe that's a non-S vs. S difference, I dunno'. The rabbit ears on my older lenses aren't rounded but they aren't what I'd call "sharply" triangular, just less round-ish and with no holes. As I say, it doesn't matter much to me, I'm just curious.
I know how aperture detection works, of course. I did the "Nikon shuffle" on my Nikkormat and still do out of habit, if only to make sure the ring operates smoothly when I switch lenses. In fact, the same Nikon website with the Thousand and One Nights has a similar page for many of the camera bodies. It suggests strongly that the rabbit ears mechanism was developed in parallel with the Nikkormat as required for through-the-lens metering and then pushed to the other bodies. But that might explain why the Tamron lens reports every shot as f/5.6, and maybe that's actually what it does.
I don't what this aperture-follower tab looks like, never seen one, only seen pictures of it and the flip-out-of-the-way thingy. When I get and if I ever use these other two film bodes (F Photomic FTn and F2 w/o metering) I'll have to check carefully. I expect all my old lenses to work just like they always did. As for stop-down metering, that's what I have to do now with the FTZ.
Unless I buy a "new" DSLR or other F-mount camera, little of this matters.
Thanks for the great informative reply. Your AI vs. AIS description makes sense. A few clarifications -
My 55mm f/3.5 does have the small aperture marking (in white) and the rounded rabbit ears with holes. What it doesn't have is the indentation on the mounting plate on the back side of the lens, which my 300mm does have. Maybe that indentation isn't indicative at all. Maybe that's a non-S vs. S difference, I dunno'. The rabbit ears on my older lenses aren't rounded but they aren't what I'd call "sharply" triangular, just less round-ish. As I say, it doesn't matter much to me, I'm just curious.
I know how aperture detection works, of course. I did the "Nikon shuffle" on my Nikkormat and still do out of habit, if only to make sure the ring operates smoothly when I switch lenses. In fact, the same Nikon website with the Thousand and One Nights has a similar page for many of the camera bodies. It suggests strongly that the rabbit ears mechanism was developed in parallel with the Nikkormat as required for through-the-lens metering and then pushed to the other bodies. But that might explain why the Tamron lens reports every shot as f/5.6, and maybe that's actually what it does.
I don't what this aperture-follower tab looks like, never seen one, only seen pictures of it and the flip-out-of-the-way thingy. When I get and if I ever use these other two film bodes (F Photomic FTn and F2 w/o metering) I'll have to check carefully. I expect all my old lenses to work just like they always did. As for stop-down metering, that's what I have to do now with the FTZ.
Unless I buy a "new" DSLR or other F-mount camera, little of this matters.
In fact, the same Nikon website with the Thousand and One Nights has a similar page for many of the camera bodies. It suggests strongly that the rabbit ears mechanism was developed in parallel with the Nikkormat as required for through-the-lens metering and then pushed to the other bodies. But that might explain why the Tamron lens reports every shot as f/5.6, and maybe that's actually what it does.