wlaidlaw Posted October 29, 2016 Share #61 Posted October 29, 2016 Advertisement (gone after registration) And what is the rate of acceleration/deceleration and does it vary from glass to glass? In that a photon has zero theoretical mass, the acceleration or deceleration from one phase velocity to another in different refractive indices, will be instantaneous. Wilson Quote Link to post Share on other sites More sharing options...
Advertisement Posted October 29, 2016 Posted October 29, 2016 Hi wlaidlaw, Take a look here Erwin Puts, "Leica Lens Saga" - Book. I'm sure you'll find what you were looking for!
Exodies Posted October 29, 2016 Share #62 Posted October 29, 2016 (edited) How do the photons know they have entered the glass? ETA but wait a minute, the photons have momentum, there was talk of pushing space ships along by firing laser beams at them. Edited October 29, 2016 by Exodies Quote Link to post Share on other sites More sharing options...
wlaidlaw Posted October 29, 2016 Share #63 Posted October 29, 2016 How do the photons know they have entered the glass? Quantum entanglement Quote Link to post Share on other sites More sharing options...
Paulus Posted October 29, 2016 Share #64 Posted October 29, 2016 How do the photons know they have entered the glass? ETA but wait a minute, the photons have momentum, there was talk of pushing space ships along by firing laser beams at them. Where was talk? Quote Link to post Share on other sites More sharing options...
marchyman Posted October 29, 2016 Share #65 Posted October 29, 2016 One example using the sun instead of lasers: LightSail | The Planetary Society Quote Link to post Share on other sites More sharing options...
ianman Posted October 29, 2016 Share #66 Posted October 29, 2016 (edited) Where was talk? I think he's talking about the project involving Stephen Hawking... http://www.space.com/32546-interstellar-spaceflight-stephen-hawking-project-starshot.html Edited October 29, 2016 by ianman 2 Quote Link to post Share on other sites More sharing options...
Exodies Posted October 29, 2016 Share #67 Posted October 29, 2016 Advertisement (gone after registration) Quantum entanglement I get your joke but, I'm not suggesting we can understand light, just wondering how much fine detail is taken into consideration by those interested in lenses. Quote Link to post Share on other sites More sharing options...
Rick Posted October 30, 2016 Author Share #68 Posted October 30, 2016 Received my copy today in America. Very nice book. Some beautiful photo examples and lots of diagrams, geometric optics ray-tracings and a ton of formulas! I feel like I'm back in optics class. Thank you Mr. Puts, Rick 1 Quote Link to post Share on other sites More sharing options...
Jeff S Posted October 30, 2016 Share #69 Posted October 30, 2016 Mr. Puts briefly summarizes the focus of his book series, including the next one.... http://www.imx.nl/photo/blog/files/b20fbf1e39c5b39de77abb49df69ad28-59.html Jeff 1 Quote Link to post Share on other sites More sharing options...
albertknappmd Posted November 4, 2016 Share #70 Posted November 4, 2016 my copy is in US customs... guess they view it as suspicious material!! Albert Quote Link to post Share on other sites More sharing options...
albertknappmd Posted November 4, 2016 Share #71 Posted November 4, 2016 or perhaps one of the agents is reading the book right now!!! Albert Quote Link to post Share on other sites More sharing options...
darylgo Posted November 10, 2016 Share #72 Posted November 10, 2016 Received my book a few days ago, haven't read much, page 28 explains why autofocus lenses are much larger than manual. I had always thought the bulk was for the motors but he says the optics must be corrected prior to the moving element(s) responsible for focus. So far this book is well worth the price and beautifully bound and match the others in white. Quote Link to post Share on other sites More sharing options...
jrp Posted March 5, 2017 Share #73 Posted March 5, 2017 Any further feed back on this book, now that people have, presumably, had the time to read it? Quote Link to post Share on other sites More sharing options...
wlaidlaw Posted March 5, 2017 Share #74 Posted March 5, 2017 (edited) Any further feed back on this book, now that people have, presumably, had the time to read it? It makes Edward Gibbons' History of the Decline and Fall of the Roman Empire in six volumes, seem like light reading I am reading it in bed at night but I keep falling asleep. Technically extremely dense would be a good description. Rather like Paul von Hasebroeck's books, I see it as more of a reference book than a reading book. One disappointment or omission, unless I have missed it, is that no mention is made of the 1999 year special edition series V Summicron in LTM (11819). I would have thought it warranted a line or two, as probably the last ever Leica LTM 50mm lens (I use one on my Reid & Sigrist III). Wilson Edited March 5, 2017 by wlaidlaw 1 Quote Link to post Share on other sites More sharing options...
colonel Posted March 8, 2017 Share #75 Posted March 8, 2017 IMHO Puts's lens work is excellent, but his projections about where cameras are going and when he thinks works are more personal and I haven't agreed with much no one is perfect but Puts is an important commentator on Leica Quote Link to post Share on other sites More sharing options...
colonel Posted March 8, 2017 Share #76 Posted March 8, 2017 Quantum entanglement ah, a fav topic of mine, glass refractions, the electrodynamics of substances with simultaneously negative values of epsilon and mu with quantum efficiency thresholds and excited-state relaxation dynamics utilising the theory of macroscopic canonical quantization in quantum optics and cavity quantum electrodynamics... but is the Leica Forum ready for this ........ Quote Link to post Share on other sites More sharing options...
pop Posted March 8, 2017 Share #77 Posted March 8, 2017 ah, a fav topic of mine, glass refractions, the electrodynamics of substances with simultaneously negative values of epsilon and mu with quantum efficiency thresholds and excited-state relaxation dynamics utilising the theory of macroscopic canonical quantization in quantum optics and cavity quantum electrodynamics... but is the Leica Forum ready for this ........ We're doing quite well with the entanglement bit, so far. 1 Quote Link to post Share on other sites More sharing options...
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