Edgar Dubrovskiy Posted October 20, 2009 Share Posted October 20, 2009 Hi! What is idea behind two focus marks on the lens - one yellow and one blue? Is focus measured from focal plane, or from front element on these series? Thanks! Link to comment Share on other sites More sharing options...
John Holland Posted October 20, 2009 Share Posted October 20, 2009 Have you ever known of any sort of lens where you measure focus from the front element ? And how about F and T stops ? Link to comment Share on other sites More sharing options...
Edgar Dubrovskiy Posted October 20, 2009 Author Share Posted October 20, 2009 (edited) mm. yes. some Sony broadcast lenses. it's just someone mentioned on this forum because of the size of the lenses, it comes down as more precise to actually measure from front on L series. that's why I'm asking. and what about F and T stops? Edited October 20, 2009 by Edgar Dubrovskiy Link to comment Share on other sites More sharing options...
Edgar Dubrovskiy Posted October 20, 2009 Author Share Posted October 20, 2009 Got the answer. http://books.google.com/books?id=r4LgHiMTM...rel&f=false Link to comment Share on other sites More sharing options...
Premium Member Stephen Williams Posted October 20, 2009 Premium Member Share Posted October 20, 2009 Hi, I remember some PV lenses having 2 focus marks, near wide open used a different mark. Look to match the color of the T stop marks with the color of witness mark. It's a long time since I used any PV lenses, but looking at the lenses it should become clear. Sephen Link to comment Share on other sites More sharing options...
Edgar Dubrovskiy Posted October 20, 2009 Author Share Posted October 20, 2009 Hi, I remember some PV lenses having 2 focus marks, near wide open used a different mark. Look to match the color of the T stop marks with the color of witness mark. Sephen Yep. That's the answer, really. It's just on some the extra mark was blue. On others - black. Thanks! Link to comment Share on other sites More sharing options...
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