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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Antispam question: Please provide registration password: Answer: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON New! Upload Image Smilies [quote][i]Originally posted by Gelios[/i] [br]Hello again! Several years ago, I had a 1973 M42 Mir 1A lens (2.8/37mm). I saw very little documents about it. Optically, it seemed similar to any other Mir 1 but the aperture system was odd: only one ring to turn with a chrome button and a spring. To adjust the diaphragm, I needed to push the button and turn the ring. As soon as I released the button, the diaphragm was linked to the ring which was used as any preset lens (full aperture to preset aperture by turning it). If I wanted to go back to full aperture, I just had to push the button and the diaphragm was set to nominal aperture. Now, the question: knowing that preset Mir 1 lenses were made since years, what was the specific use of such lens (if any)? BTW, there is one to sell on Ebay (Item #360076906260): not really cheap ($80) for a Mir 1 but it is not the usual type... Thanks for your comments! [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.