tag:blogger.com,1999:blog-1320126156594375642.post4002373511944035490..comments2024-03-27T11:02:08.037-05:00Comments on LEICA Barnack Berek Blog: LEICA 180mm F/3.4 APO-TELYT-RLEICA Barnack Berek Bloghttp://www.blogger.com/profile/09055435560407011075noreply@blogger.comBlogger8125tag:blogger.com,1999:blog-1320126156594375642.post-47876416186051697262012-09-15T14:20:13.841-05:002012-09-15T14:20:13.841-05:00Thank you, Carl, for your comments. I hope to hea...Thank you, Carl, for your comments. I hope to hear from you again on these pages. With your knowledge about Leica, it would definitely make this blog that much more interesting.<br />I also want to mention that you are welcome to use any of the material on this blog for you own publocations on the LHSA site or elsewhere.LEICA Barnack Berek Bloghttps://www.blogger.com/profile/09055435560407011075noreply@blogger.comtag:blogger.com,1999:blog-1320126156594375642.post-59692534256680256012012-09-09T14:28:39.258-05:002012-09-09T14:28:39.258-05:00I should also add that these figures include infra...I should also add that these figures include infrared. With the visible spectrum only, the focus shift of the Apo-Telyt is only 20 nanometers. That is an incredibly small amount!LEICA Barnack Berek Bloghttps://www.blogger.com/profile/09055435560407011075noreply@blogger.comtag:blogger.com,1999:blog-1320126156594375642.post-5082100617945935772012-09-01T13:12:23.448-05:002012-09-01T13:12:23.448-05:00Thanks for the additional info and for the link to...Thanks for the additional info and for the link to my Leica Blog post.<br />RegardsCarl Merkinhttp://blog.leica-camera.com/topics/photographers/blog-contributors/carl-merkin/noreply@blogger.comtag:blogger.com,1999:blog-1320126156594375642.post-15443746825940486822012-08-31T11:02:22.533-05:002012-08-31T11:02:22.533-05:00I used to own one of the 180 Apo-Telyt. It was an...I used to own one of the 180 Apo-Telyt. It was an excellent lens, but my interests changed and I didn't need a long lens anymore. I traded it for some other equipment.<br />I am glad I came across your blog. It is very informative and has a lot of articles not found on other Leica blogs. Keep up the good work.fschaperhttps://www.blogger.com/profile/04182426840411690711noreply@blogger.comtag:blogger.com,1999:blog-1320126156594375642.post-59672053379903061602012-08-30T11:18:44.477-05:002012-08-30T11:18:44.477-05:00I have not seen any comparison tests and I don'...I have not seen any comparison tests and I don't have the MTF function of the Apo-Telyt available at the moment. I do recall those read-outs to be absolutely stunning. It appears that the new 50mm f/2 Apo-Summicron has an equal or possibly even better performance. But all in all, even today after 40+ years, there are very few lenses that will equal or outperform the Apo Telyt. I wrote about the test data the US Navy came up with about the Apo-Telyt in the Blog article "Manufacture and Performance of Photographic lenses." The figures are absolutely amazing. Go to<br />http://gmpphoto.blogspot.com/2012/02/by-heinz-richter-few-industrial.html <br />to see them.LEICA Barnack Berek Bloghttps://www.blogger.com/profile/09055435560407011075noreply@blogger.comtag:blogger.com,1999:blog-1320126156594375642.post-11420210883757365212012-08-30T10:05:38.778-05:002012-08-30T10:05:38.778-05:00Are there any other Leica lenses that equal the pe...Are there any other Leica lenses that equal the performance of the Apo-Tely?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-1320126156594375642.post-38740289690150177022012-08-29T08:56:05.439-05:002012-08-29T08:56:05.439-05:00Both. It is a matter of interpretation. With the...Both. It is a matter of interpretation. With the lens focused at the midpoint of the spectrum, about 550 nanometrs, then the focus shift is 45 nanometers either way. However, theoretically the lens could also be focused at the far blue point, in which case the total shift is 90 nanometers.LEICA Barnack Berek Bloghttps://www.blogger.com/profile/09055435560407011075noreply@blogger.comtag:blogger.com,1999:blog-1320126156594375642.post-89273150853137980872012-08-29T07:46:37.579-05:002012-08-29T07:46:37.579-05:00If I interpret the graph correctly, it indicates t...If I interpret the graph correctly, it indicates that the maximum focus shift is 90 nanometers, but your article indicates 45. Which is correct?Anonymoushttps://www.blogger.com/profile/15469641643604325593noreply@blogger.com