telewatt Posted February 18, 2012 Share #1 Posted February 18, 2012 Advertisement (gone after registration) Leicaflex was known for its bright viewfinder, through a simple way a effective and expensive lens on the focusing screen. In addition, the the bottom of the prism was made as a converging lens, a very expensive way to go! left a R8/9 screen and right the SL2 screen... 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! ..I hope you like it... regards, Jan Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! ..I hope you like it... regards, Jan ' data-webShareUrl='https://www.l-camera-forum.com/topic/172947-the-secret-of-the-leicaflex-screen/?do=findComment&comment=1930138'>More sharing options...
Advertisement Posted February 18, 2012 Posted February 18, 2012 Hi telewatt, Take a look here the secret of the Leicaflex screen..... I'm sure you'll find what you were looking for!
Michael Geschlecht Posted February 18, 2012 Share #2 Posted February 18, 2012 Hello Jan, Another reason for the brightness & ease of focussing w/ a SL or SL2 is: The SL2 screen, except for the split image portion, is all microprisms. Smaller microprisms over the majority of the screen, larger microprisms in the donut. The SL screen w/o split image center, which could be ordered for the SL2 also, had smaller microprisms over most of the screen & larger microprisms in the center spot. Best Regards, Michael Link to post Share on other sites More sharing options...
telewatt Posted February 18, 2012 Author Share #3 Posted February 18, 2012 Thank you Michael for your additions! Jan Link to post Share on other sites More sharing options...
TomB_tx Posted February 18, 2012 Share #4 Posted February 18, 2012 While the microprism screens are brighter, the disadvantage is that they inherently work best with the lens range they are designed for. The SL screen was great for the 50 Summicron, but when I switched to a Summilux 50 I noticed I couldn't focus it as well, when I expected the shallower DOF would help. I had also put a full microprsim screen in my R4, and noticed the same problem with the Summilux. I changed it to a groundglass screen, and suddenly the Summilux was much easier to focus. I understand the angles cut in the microprisms need to be different to be optimal for fast lenses. Link to post Share on other sites More sharing options...
Michael Geschlecht Posted February 18, 2012 Share #5 Posted February 18, 2012 Hello Tom, You could also order a ground glass screen for the SL2. I don't know about the SL. Best Regards, Michael Link to post Share on other sites More sharing options...
Michael Geschlecht Posted February 19, 2012 Share #6 Posted February 19, 2012 Hello Everybody, I did some more looking: You could order a plain groundglass for the SL. I wonder if you could have the later SL & SL2 screens fitted to the the Original Leicaflex? Another thought: Could you order a non-focussing 1st Leicaflex screen for the SL or SL2? Best Regards, Michael Link to post Share on other sites More sharing options...
gyoung Posted February 19, 2012 Share #7 Posted February 19, 2012 Advertisement (gone after registration) I think Nikon used to offer a choice of microprism screens, each for a range of focal lengths. I can't think of a reason why two 50mm lenses should require different prism angles, might be that the Summilux has less resolution at full aperture than the Summicron? ;-) Gerry Link to post Share on other sites More sharing options...
TomB_tx Posted February 19, 2012 Share #8 Posted February 19, 2012 I know Pentax LX offered a special microprism spot with different angles just for fast lenses, and I think the Canon F1 did the same. It isn't a sharpness issue: on groundglass I find the Summilux easier to focus than the Summicron. Link to post Share on other sites More sharing options...
Michael Geschlecht Posted February 20, 2012 Share #9 Posted February 20, 2012 Hello Everybody, The reason for the different screens for different lenses is: Microprisms are ground @ different angles for lenses of different F stops. Not different focal lengths. Most general use screens are ground @ an angle which is a compromise: Most useful for the range of lenses a manufacturer thinks is most likely that most users will have. For example: Many microprism screens work best in the range from F2 to F4. Best Regards, Michael Link to post Share on other sites More sharing options...
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