k-hawinkler Posted May 18, 2011 Share #21 Â Posted May 18, 2011 Advertisement (gone after registration) Washington, Â Many, many thanks. You are being very innovative indeed! Â It looks like for that lens (65mm?) the focusing screen works pretty well. Â Best, K-H. Link to post Share on other sites More sharing options...
Advertisement Posted May 18, 2011 Posted May 18, 2011 Hi k-hawinkler, Take a look here Brighter Visoflex focusing screen?. I'm sure you'll find what you were looking for!
Washington Posted May 18, 2011 Author Share #22  Posted May 18, 2011 It does quite well. But, when I find some .018’’ shim material I want to try this fine matt screen too. Link to post Share on other sites More sharing options...
Washington Posted May 20, 2011 Author Share #23  Posted May 20, 2011 I fitted the slightly modified Canon Mk III Ds screen, and unlike the thinner spit-image screen K-H sent me, this one back focuses 3’’ at 8 feet….. photo’s were noticeably unsharp at longer distance. I removed the two .2mm shims and back focus increased dramatically. So, when I get some shims together: this will be corrected. The fine-matt screen is definitely the better choice though. It is brighter and very clear. However, all in all, there is nothing wrong with the ‘’stock’’ glass screen. Link to post Share on other sites More sharing options...
Washington Posted May 25, 2011 Author Share #24  Posted May 25, 2011 I now have an assortment of shims in .002’’, .0035’’ and .007’’…. time to start fitting and testing, fitting and testing….. until it’s dead-on. Link to post Share on other sites More sharing options...
Washington Posted May 26, 2011 Author Share #25  Posted May 26, 2011 After a few hours of adjusting and getting it right and now trying out assorted lenses on it I find the longer teles create some sort of strange pattern on the screen that look like feint radial cracks. Conclusion: phooey. It’s not all that brighter than the glass Leica screen anyway…. having a clean mirror and prism assembly is more important than this exercise …. so it’s back to the original screen. Naturally there my be other screens people have had better results with but it sure isn’t this one. Cheers. Link to post Share on other sites More sharing options...
k-hawinkler Posted May 26, 2011 Share #26 Â Posted May 26, 2011 Washington, Â Many thanks for the report. I am glad then that I decided to stick with the original Leitz matte glass screen. Â Best, K-H. Link to post Share on other sites More sharing options...
Washington Posted May 26, 2011 Author Share #27  Posted May 26, 2011 Advertisement (gone after registration) Yes indeed and so will I. Talk about more trouble than it’s worth! Glass is a whole lot better than cheap plastic anyway. Link to post Share on other sites More sharing options...
Washington Posted May 26, 2011 Author Share #28  Posted May 26, 2011 K-H, After removal and magnified inspection the ‘’radial lines’’ were minute scratches caused by me handling and fitting the screen. Canon provides a tab and tweezers to fit this screen in Canons…. but, I had to remove the tab fit for fitting in the Viso frame. Screw plastic! Link to post Share on other sites More sharing options...
k-hawinkler Posted May 27, 2011 Share #29  Posted May 27, 2011 Washington,  Couldn't have said it better myself. With a correctly adjusted Visoflex and some luck, occasionally I get some pretty good focus, for example:  http://www.l-camera-forum.com/leica-forum/1714207-post9.html http://www.l-camera-forum.com/leica-forum/1695075-post9.html http://www.l-camera-forum.com/leica-forum/nature-wildlife/183149-hummingbird-m9-viso-iii-5-oufro.html http://www.l-camera-forum.com/leica-forum/nature-wildlife/181512-bees-dark-light-3-images.html  Best, K-H. Link to post Share on other sites More sharing options...
Washington Posted May 27, 2011 Author Share #30 Â Posted May 27, 2011 Wow, those are great buddy!!!!!! Thank you so much. These are quite special. I too am in wonderment concerning the extension tubes. Please, keep up with this work! Link to post Share on other sites More sharing options...
Robert_M Posted May 27, 2011 Share #31 Â Posted May 27, 2011 K-H, Â Wonderful work. I'm inspired to attempt to tune up my viso+lenses. Only hope I can get something close to those results. Â RM Link to post Share on other sites More sharing options...
Washington Posted May 27, 2011 Author Share #32 Â Posted May 27, 2011 Worth the doing Robert! Link to post Share on other sites More sharing options...
swamiji Posted October 29, 2011 Share #33 Â Posted October 29, 2011 The Brightscreen is not recommended. It has a hotspot. Â One of my Visoflex had a severe screen problem, almost unusable, had all sorts of marks on the inside. I am still not sure about the cause. So I decided to try a Brightscreen Plain Matt (Type 1), as you mentioned that the type 4 had hotspots. Just got it back, looks clear bright focused at infinity. No hotspots. Â The folks at Brightscreen said it was the nature of focusing aids that hotspots are created. The type 4 has been discontinued, the type 5 has replaced it, but it most likely still has hotspots. Link to post Share on other sites More sharing options...
algrove Posted October 29, 2011 Share #34 Â Posted October 29, 2011 Wow, you guys are so far ahead of me I almost feel I cannot catch up. I just acquired my first Viso III and a 280 f4.8. Â Have not even tried it, but based on this thread it will not be easy to "dial in". I hate to open it up in order to see what shims are in it, not to mention focusing screen issues! Link to post Share on other sites More sharing options...
pico Posted October 29, 2011 Share #35 Â Posted October 29, 2011 Wow, you guys are so far ahead of me I almost feel I cannot catch up. I just acquired my first Viso III and a 280 f4.8. Â Have not even tried it, but based on this thread it will not be easy to "dial in". I hate to open it up in order to see what shims are in it, not to mention focusing screen issues! Â I have an early Visoflex right here on my workbench and haven't dared to try shimming the screen yet. I've worked with shims for very large, aerial photo lenses which was daunting enough. Washington's work inspires me to give it a go. Â Can you recommend the proper micrometers? Mine is rather worn away. Link to post Share on other sites More sharing options...
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