Archived posting to the Leica Users Group, 2002/06/26
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Frank, A few years ago, I needed a custom diopter made for my M, and the following is based on information I got from Dave Elwell of Leica Parts as well as the optician whom he recommended for the job. It worked. I am age 70, require a large correction, and have little or no native accomodative abililty. The M eyepiece is a MINUS 0.5 diopter. Your correction eyepiece screws in over the M's built-in eyepiece. You use your own DISTANCE correction and SUBTRACT this minus figure from it. So.........if your distance correction is, say, plus 1.0, then your eyepiece correction would be plus 1.5, and you would use this, of course, with your eyeglasses off. That's my understanding. I am not an eye doctor. Regards.............Julian - ----- Original Message ----- From: "Frank Filippone" <red735i@earthlink.net> To: <leica-users@mejac.palo-alto.ca.us> Cc: <rclompus@cox.net> Sent: Wednesday, June 26, 2002 1:32 AM Subject: RE: [Leica] Eyeglasses and diopter adjustment lenses Richard.. my reading perscription from my Dr. is +2. I went to a Leica store and tried +1.5, +2, +1.0, 0 (no diopter) and -.5. There was no +.5 available. This was on a .72 Leica M7 ( I have a M6, but the VF should be the same) and compared to a M6 ( mine) so I could swap diopters and try things out as a comparison..... The +1.5 should have been perfect, given the finder is supposed to be a +.5 on its own ands assuming my reading perscription is what I should be equating to........ wrong... The best I could tell was 0.. none... with the +1 equally good/bad... so I think maybe that I need a +.5 Note that the -.5 was substanbtially worse than the 0. So a - anything looks worng for me as well... I tried this with my glasses on and off... with virtually little change... the glasses were used in the chin down position, using the far distance perscription...... My conclusion is that you can not guess nor calculate .. you must go to a store and try the things out..... YMMV I have tried this twice now.. once on my Hassy, and now on the Leica.... Neither worked as the equations should have....I use a chimney finder ont he Hassy that has a variable Diopter built in and the PME 90, ditto the adjustability..... The M6 is unsuccessful to date.... Frank Filippone red735i@earthlink.net - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html