120 Posted June 19, 2013 Share #121 Posted June 19, 2013 Advertisement (gone after registration) ...see especially the US military papers on rangefinders... correction, rangefinder cameras Link to post Share on other sites More sharing options...
Advertisement Posted June 19, 2013 Posted June 19, 2013 Hi 120, Take a look here 3 months of M240 - am I keeping it?. I'm sure you'll find what you were looking for!
jaapv Posted June 19, 2013 Share #122 Posted June 19, 2013 Those must be ancient. Link to post Share on other sites More sharing options...
120 Posted June 19, 2013 Share #123 Posted June 19, 2013 Those must be ancient. lol, I don't think the laws of optics have changed since Leica started making cameras. I didn't expect anyone to challenge the lens equation, but I am sure that is what's used. I don't know of any reasonably detailed, mainstream references on rangefinder camera design...just see how the formula is used in general optical design, I guess. Link to post Share on other sites More sharing options...
120 Posted June 20, 2013 Share #124 Posted June 20, 2013 I think that was the way it was done with the first cams,about eighty years ago. His source must be caught in a time warp . Nowadays they are machined to a narrow tolerance and I believe not by Leica themselves but by Uwe Weller. found two references to cams, one to a piecewise (two-piece) Leica cam about 1970; the other suggesting the "best" cams are hand finished point-by-point over the entire cam. Link to post Share on other sites More sharing options...
A Sfeir Posted June 22, 2013 Share #125 Posted June 22, 2013 Thanks for an excellent review, short and to the point. Agree with most comments regarding lenses, and the comparison with D800. One point though concerning "The CV 15mm is useless on the M240. Whichever lens coding I try, every shot is ruined by extreme colour shading. For B&W use only". I love this lens, and now that LR has a simple plug in for flat field correction, it has become very easy to correct for the color shading. The -ff in the file name stands for flat field A couple of examples: Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! ' data-webShareUrl='https://www.l-camera-forum.com/topic/206832-3-months-of-m240-am-i-keeping-it/?do=findComment&comment=2355953'>More sharing options...
jaapv Posted June 23, 2013 Share #126 Posted June 23, 2013 lol, I don't think the laws of optics have changed since Leica started making cameras. I didn't expect anyone to challenge the lens equation, but I am sure that is what's used. I don't know of any reasonably detailed, mainstream references on rangefinder camera design...just see how the formula is used in general optical design, I guess. It is just that the last handbook of the Leica M system for the US army dates back to the KE 7 A Have a look here as well: http://www.pentax-manuals.com/manuals/service/leica%20basic%20repair.pdf Link to post Share on other sites More sharing options...
120 Posted June 23, 2013 Share #127 Posted June 23, 2013 Advertisement (gone after registration) It is just that the last handbook of the Leica M system for the US army dates back to the KE 7 A Have a look here as well: http://www.pentax-manuals.com/manuals/service/leica%20basic%20repair.pdf The extension of a unit focusing lens and the turning of the telescope/prism lever must obey the lens equation and trigonometry. I am having trouble imagining what you are imagining has changed since the 1930's, that would have an impact on this design of mechanical rangefinder? Thank you for the link Jaap; I did have that one. Do you maybe have one for the KE-7A manual? Link to post Share on other sites More sharing options...
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