Steve Ricoh Posted January 7, 2022 Share #1 Posted January 7, 2022 Advertisement (gone after registration) Read this if like me you faff around twiddling focus to get perfectly aligned focussing patch on a RF. https://www.leicalensesfornormalpeople.com/2021/10/20/reverse-zone-focusing-or-learning-to-be-faster-with-your-rangefinder-camera/ 1 Link to post Share on other sites More sharing options...
Advertisement Posted January 7, 2022 Posted January 7, 2022 Hi Steve Ricoh, Take a look here Reverse Zone Focussing. I'm sure you'll find what you were looking for!
Alberti Posted January 12, 2022 Share #2 Posted January 12, 2022 (edited) Once I patched some yellow filter on the RF glass of my M8. So I could see which image was which when checking the allowed difference. This link does not clearly show me how it is done. 😪 The old M2 had a beautiful rangefinder patch with a small and a large pad, the small one on top and the larger on the bottom, that showed the allowed delta between the two patches - and hence the depth or change of focus. I imagine it helped combat focus shift in those old days . . Edited January 12, 2022 by Alberti Link to post Share on other sites More sharing options...
jaapv Posted January 12, 2022 Share #3 Posted January 12, 2022 Quote Someone smarter than I will/can/should come up with a better name for what I am describing. If that is you, please contact me. I will update this post. I am not attached to the term “reverse zone focusing.” I almost hope it doesn’t stick. It sounds stupid. Farting around? Sheesh... 🙄 1 Link to post Share on other sites More sharing options...
Steve Ricoh Posted January 13, 2022 Author Share #4 Posted January 13, 2022 22 hours ago, Alberti said: Once I patched some yellow filter on the RF glass of my M8. So I could see which image was which when checking the allowed difference. This link does not clearly show me how it is done. 😪 The old M2 had a beautiful rangefinder patch with a small and a large pad, the small one on top and the larger on the bottom, that showed the allowed delta between the two patches - and hence the depth or change of focus. I imagine it helped combat focus shift in those old days . . The author was experimenting to find the latitude of alignment. For several years I’ve been hunting back and forth to get precise alignment of the ghost image, as near as humanly possible. I’ve been wasting my time, it would appear, near enough will do (depending on focal length and aperture of course). Link to post Share on other sites More sharing options...
jaapv Posted January 13, 2022 Share #5 Posted January 13, 2022 It is absolute nonsense One would have to determine the delta for each aperture, each subject distance and each print size. And each subject's frequency and contrast, for that matter. Link to post Share on other sites More sharing options...
Steve Ricoh Posted January 13, 2022 Author Share #6 Posted January 13, 2022 I’m more interested in the principle, not the absolutes. Link to post Share on other sites More sharing options...
jaapv Posted January 13, 2022 Share #7 Posted January 13, 2022 Advertisement (gone after registration) The principle is OK, for the absolute, which this guy strives to find, see my post above... Link to post Share on other sites More sharing options...
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