bayernfan Posted June 19, 2020 Share #1 Posted June 19, 2020 Advertisement (gone after registration) Are there known resources available that specify the details of the optical elements in classic Leitz/Leica lenses? I would need: lens curvature, thickness, index of refraction, abbe number, and z-axis coordinates. I suppose I could dismantle a lens to physically measure all or some of these values, but I had hoped a quick reference was available. Big thank you for any assistance. Link to post Share on other sites More sharing options...
Advertisement Posted June 19, 2020 Posted June 19, 2020 Hi bayernfan, Take a look here Seeking Lens Element Specifications. I'm sure you'll find what you were looking for!
adan Posted June 19, 2020 Share #2 Posted June 19, 2020 (edited) There is a blog (in Italian) that gives some of that information for some lenses. I stumble into it googling lens diagrams sometimes, but cannot ID it right now (perhaps someone else can). Edited June 19, 2020 by adan Link to post Share on other sites More sharing options...
bayernfan Posted June 19, 2020 Author Share #3 Posted June 19, 2020 15 minutes ago, adan said: There is a blog (in Italian) that gives some of that information for some lenses. I stumble into it googling lens diagrams sometimes, but cannot ID it right now (perhaps someone else can). would this happen to be the website: http://www.marcocavina.com/articoli_fotografici/50mm_Leica_a_telemetro/00_pag.htm 1 Link to post Share on other sites More sharing options...
Jeff S Posted June 20, 2020 Share #4 Posted June 20, 2020 (edited) This might provide a bit... https://lhsa.org/2018/09/rare-earth-glass-leica-lenses-a-quick-and-quirky-overview/ You might contact LHSA for more, or for possible sourcing guidance. I don’t know how much info might be included , if any, in various books/documents from Erwin Puts. Jeff Edited June 20, 2020 by Jeff S 1 Link to post Share on other sites More sharing options...
adan Posted June 20, 2020 Share #5 Posted June 20, 2020 (edited) 5 hours ago, bayernfan said: would this happen to be the website: http://www.marcocavina.com/articoli_fotografici/50mm_Leica_a_telemetro/00_pag.htm That is one part - here are some others. Seems to be a strangely-constructed site (or sites). The first link has an index to quite a few lens analyses (not all Leica). http://www.marcocavina.com/articoli_tecnici_fotografici.htm http://www.marcocavina.com/articoli_fotografici/Leica_35_1,4_aspherical/00_pag.htm As a fan of the 1980 21 Elmarit, I like this progression of how an aerial lens and a 25mm f/2.8 prototype morphed and changed to get to the final 21mm design. http://www.marcocavina.com/articoli_fotografici/Leica_M_21mm_2,8/00_pag.htm Edited June 20, 2020 by adan 1 Link to post Share on other sites More sharing options...
Erato Posted June 20, 2020 Share #6 Posted June 20, 2020 (edited) FYR. Erwin Puts -- Leica Compendium by Erwin Puts -- Leica Chronicle by Erwin Puts And if you're looking for more reviews, Thorsten von Overgaard and Leicaphilia is time-worthy. Other resources with optical design infographic are also valuable for further reading... https://kenrockwell.com/leica/lens-reviews.htm Ken's review, you may tapping into link for targeted lens. Sometimes the optical design infographic also included. https://www.oldlens.com/index.htm Copyright (c) by oldlens.com All Rights Reserved. Comes with the optical design infographic and small size test shots. Edited June 20, 2020 by Erato 1 Link to post Share on other sites More sharing options...
bayernfan Posted June 20, 2020 Author Share #7 Posted June 20, 2020 (edited) Advertisement (gone after registration) 3 hours ago, adan said: That is one part - here are some others. Seems to be a strangely-constructed site (or sites). The first link has an index to quite a few lens analyses (not all Leica). http://www.marcocavina.com/articoli_tecnici_fotografici.htm http://www.marcocavina.com/articoli_fotografici/Leica_35_1,4_aspherical/00_pag.htm As a fan of the 1980 21 Elmarit, I like this progression of how an aerial lens and a 25mm f/2.8 prototype morphed and changed to get to the final 21mm design. http://www.marcocavina.com/articoli_fotografici/Leica_M_21mm_2,8/00_pag.htm I wonder if there is a database out there containing the patent paperwork for all of these older designs. The Marco Cavino site is definitely a great resource for refractive indices and abbe (dispersion) numbers. Not much in the way of geometric measurements, but I suppose I could calculate those by scale if I can get the diameter of one of the elements. Edited June 20, 2020 by bayernfan Link to post Share on other sites More sharing options...
ianman Posted June 20, 2020 Share #8 Posted June 20, 2020 One of the best resources I know of is over on the summilux.net forum http://www.summilux.net/documents/index.php 1 Link to post Share on other sites More sharing options...
bayernfan Posted June 22, 2020 Author Share #9 Posted June 22, 2020 Just a quick update, I found many of the patented designs I was seeking (with design parameters) in some books that cover optical design theory. If anyone is interested, I can point them in the right direction. Link to post Share on other sites More sharing options...
pgk Posted June 22, 2020 Share #10 Posted June 22, 2020 It might also be worth looking for some glass manufacturer's catalogues from relevant periods, as glass formulations should be listed and I aware that they change and some become unavailable over time. Link to post Share on other sites More sharing options...
JPerezZab Posted January 31, 2021 Share #11 Posted January 31, 2021 (edited) On 6/22/2020 at 1:07 AM, bayernfan said: Just a quick update, I found many of the patented designs I was seeking (with design parameters) in some books that cover optical design theory. If anyone is interested, I can point them in the right direction. That´s great. I am trying to find a replacement (or at least, something similar from another manufacturer) of a front element for a Summaron f3.5cm 3.5. Is it included in the book you mentioned? Edited January 31, 2021 by JPerezZab Link to post Share on other sites More sharing options...
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