tag:blogger.com,1999:blog-1320126156594375642.post5418859148091747017..comments2024-03-27T11:02:08.037-05:00Comments on LEICA Barnack Berek Blog: AN INTERVIEW WITH MAX BEREKLEICA Barnack Berek Bloghttp://www.blogger.com/profile/09055435560407011075noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-1320126156594375642.post-57938767718623169882019-10-26T10:08:03.522-05:002019-10-26T10:08:03.522-05:00The list below the lens diagram is referring to th...The list below the lens diagram is referring to the individual lens elements. The first numbers indicate the surface radius of the front and rear of each element in millimeters. The infinity mark simply means that that particular surface is flat without any curvature at all. The next number indicates the maximum or minimum thickness of the lens elements as well as the width of the spaces in between. The third and fifths numbers are very similar. They indicate the refractive index of the glass used at two different wave lengths of the light. Finally, the fourth numbers are the Abbe numbers of the glass, indicating the dispersion of the types of glass used.LEICA Barnack Berek Bloghttps://www.blogger.com/profile/09055435560407011075noreply@blogger.comtag:blogger.com,1999:blog-1320126156594375642.post-46811637602641750122019-10-26T10:07:12.396-05:002019-10-26T10:07:12.396-05:00The handwritten note is quite interesting, but har...The handwritten note is quite interesting, but hard to read. I see that Berek made specific notes regarding the individual lens elements. Do you have any idea what the numbers are referring to?Anonymousnoreply@blogger.com