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Amazon.com : FocusFoto Pro Built-in Aperture Control Lens Mount Adapter Ring for Canon EOS EF Lens to Nikon 1 N1 Mount Mirrorless Camera Body J1, J2, J3, J4, J5, S1, S2, V1,
![What is “A” on this lens's aperture ring? You need to push a button to lock in into place. Pentax k1000 with smc Pentax-A 50mm f/2.8 : r/AnalogCommunity What is “A” on this lens's aperture ring? You need to push a button to lock in into place. Pentax k1000 with smc Pentax-A 50mm f/2.8 : r/AnalogCommunity](https://preview.redd.it/what-is-a-on-this-lenss-aperture-ring-you-need-to-push-a-v0-bksuuyj2qc5a1.jpg?auto=webp&s=2eda1ddba91a41bb8a7cf95597456d982c43ec29)
What is “A” on this lens's aperture ring? You need to push a button to lock in into place. Pentax k1000 with smc Pentax-A 50mm f/2.8 : r/AnalogCommunity
![lens - What is the little metal piece attached to the aperture ring in some Zeiss lenses? - Photography Stack Exchange lens - What is the little metal piece attached to the aperture ring in some Zeiss lenses? - Photography Stack Exchange](https://i.stack.imgur.com/XmG4I.jpg)