I'm trying to find detailed lens diagrams (showing the lens elements) of this old prime lens I have but I can't seem to find anything. Does anyone know where could I find it?

Here are some photos of the lens:

photo of the lens front

photo of the lens's rings

  • \$\begingroup\$ You could improve its performance by taking that UV filter off ;) \$\endgroup\$
    – Tetsujin
    Dec 30, 2023 at 18:29

1 Answer 1


It's of a double gauss design...

enter image description here

  • \$\begingroup\$ Where could I find the table with its information like radius, glass and other stuff? \$\endgroup\$
    – meto pop6
    Dec 30, 2023 at 15:10
  • 2
    \$\begingroup\$ @metopop6, I don't believe I've ever seen those specifics given for any lens... not even in a patent application. \$\endgroup\$ Dec 30, 2023 at 15:32
  • 1
    \$\begingroup\$ @metapop6, service manuals for camera gear are nearly impossible to find/get your hands on. Something like a youtube teardown might be closest you can get. \$\endgroup\$
    – inkista
    Dec 30, 2023 at 19:34
  • \$\begingroup\$ @StevenKersting I wonder could you indicate where you sourced this diagram? \$\endgroup\$
    – osullic
    Dec 31, 2023 at 19:31
  • 2
    \$\begingroup\$ @osullic, there's a few sources for Pentacon/Praktica information; but this came from camera-wiki.org: camera-wiki.org/wiki/Pentacon_auto_1.8/50 \$\endgroup\$ Dec 31, 2023 at 22:05

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