Automatic Exposure (AE) mode on vintage manual lens

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sphinx2 New Member • Posts: 8
Automatic Exposure (AE) mode on vintage manual lens

I got a vintage Tamron lens from 1970s today. I am attaching it to my Sony Nex through a dumb adapter. I noticed there is an "A-M" switch on the lens and an "AE" printed on the left hand side of smallest aperture.

After some digging I know AE is Automatic Exposure, but all the search results are talking about AE on camera body not on lens. So my questions are:

  • How does AE work on a manual lens that does not communicate with camera body in the 1970s?
  • What happens when I switch between A and M (means auto and manual?) on the lens?
  • How would AE working with lens attach to a digital body through a dumb adapter? (Might duplicate 1st question)

Sorry if this a dumb question. I had old manual lens on film cameras but haven't seen this AE lens before.

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