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Can someone please explain these markings? What is the green line for above the aperture ring? : r/Cameras
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telephoto - What is the purpose of various lens markings on Vivitar 135mm f/2.5 lens with TX mount? - Photography Stack Exchange
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The Markings On The Barrel Of A 1980s Manual-focus Wide-angle Camera Lens, Showing Aperture, Distance And Depth-of-field. Stock Photo, Picture and Royalty Free Image. Image 2407980.
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