Tears Everywhere Posted January 23, 2024 Author Share #221 Â Posted January 23, 2024 Advertisement (gone after registration) 11 hours ago, Michael Geschlecht said: There have been occasional printing or data errors in various Leitz/Leica data sheets, etc. over the years. The 2 lens diagrams look reasonably similar. Thanks for your opinion. The 2 lens diagrams only have one difference, inner side or outer side of last glass is aspheric. That is a key point for 11686, the rebuild of legendary lens 11820 50/1.2. All the aspheric surfaces of 11820 were at the outer side of lens. Quote Link to post Share on other sites More sharing options...
Advertisement Posted January 23, 2024 Posted January 23, 2024 Hi Tears Everywhere, Take a look here Leitz Xenon 5cm f/1.5 Brief Guide - Rumors and Facts. I'm sure you'll find what you were looking for!
pippy Posted January 23, 2024 Share #222 Â Posted January 23, 2024 (edited) 23 minutes ago, Tears Everywhere said: ...The 2 lens diagrams only have one difference, inner side or outer side of last glass is aspheric... Might it simply be that the lines are pointing to the pair of elements which are aspherical; not specifically which actual surface of these two elements is aspherical? Just a thought! P. Edited January 23, 2024 by pippy 1 Quote Link to post Share on other sites More sharing options...
Tears Everywhere Posted March 8, 2024 Author Share #223  Posted March 8, 2024 On 1/23/2024 at 6:39 AM, willeica said: I can ask Peter Karbe about this, but, as before, you need to be more specific about the point you are making. Peter is a 'facts man' and there is no point in going to him and saying that 'I know something ' or 'a person I know says something'. Can you 1. be more specific about what you are saying, and, also , 2. can say how or why this matters? Hi, I had sent my questions in a message to you one month ago. Although they are penetrating questions, I am still hoping there would be an formal answer from Leica. 😅   Quote Link to post Share on other sites More sharing options...
willeica Posted March 9, 2024 Share #224  Posted March 9, 2024 2 hours ago, Tears Everywhere said: Hi, I had sent my questions in a message to you one month ago. Although they are penetrating questions, I am still hoping there would be an formal answer from Leica. 😅   I have been busy with a lot of things lately, but I should be able to send him an email over the weekend. I have also a recent question from someone else about the type of glass in Noctilux lenses, which may or may not be connected to your questions. I will send you any responses he might give. William Quote Link to post Share on other sites More sharing options...
Giuliobigazzi Posted May 2, 2024 Share #225  Posted May 2, 2024 I’m trying to find information about the 4 prototypes from 1935, does anyone here have any images? Were these al nickel? Quote Link to post Share on other sites More sharing options...
alan mcfall Posted May 2, 2024 Share #226 Â Posted May 2, 2024 270004 is in the Leitz museum and pictured in the Lager Lens book, and also viewfinder magazine 9-4. I believe that all of these 4 or 5 prototypes(270001-5) were nickel, but have only seen just this one. 1 Quote Link to post Share on other sites More sharing options...
Giuliobigazzi Posted May 4, 2024 Share #227  Posted May 4, 2024 Advertisement (gone after registration) Ive just found this photo in a French Leica book. I always assumed the prototypes were nickel finish but it seems they were in chrome. 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! 1 Quote 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/309062-leitz-xenon-5cm-f15-brief-guide-rumors-and-facts/?do=findComment&comment=5248601'>More sharing options...
Giuliobigazzi Posted May 7, 2024 Share #228  Posted May 7, 2024 I have just received this lens which I think will prove invaluable to this thread.  Lens number 288015 has no U.S. patent number, no DRPa engraving, no infrared R mark on the depth of field scale, and distance scale is in meters.  All traits shared with prototype 270004. Examining the delivery notes provides us with additional insight. This special lens was delivered nearly three months prior to the official release, destined for Alfred Boch, Vice President of Leitz New York. Mr Boch, who frequently journeyed between Wetzlar and New York, often received pre-production pieces, notably the first Summicron 5cm 922001. On the delivery ledger there is a note after his name,(Reise). Alfred Boch was to take  this lens with him to showcase the new superfast model before it was officially launched. Serial 288010 was delivered on the same day, as a loaner lens (leihw), to Berlin, a second demonstration piece presumably to present to the domestic market. These two lenses appear to be the first ever Leitz Xenons delivered from the production line. 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! 3 Quote 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/309062-leitz-xenon-5cm-f15-brief-guide-rumors-and-facts/?do=findComment&comment=5255754'>More sharing options...
sandro Posted May 12, 2024 Share #229 Â Posted May 12, 2024 Very interesting indeed! Where did you find the information about delivery to Alfred Boch? Lex Quote Link to post Share on other sites More sharing options...
Giuliobigazzi Posted May 13, 2024 Share #230 Â Posted May 13, 2024 Hi Lex, these are entries in the delivery book 1 Quote Link to post Share on other sites More sharing options...
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