Patents related to photo lenses

Started 6 months ago | Discussions thread
AiryDiscus Senior Member • Posts: 2,138
Re: Leitz 800mm f6.3
1

bclaff wrote:

Dibyendu Majumdar wrote:

I think this one is for the Leica 800mm f6.3 which was one of the earliest 35mm lenses to feature ED like glass.

https://patents.google.com/patent/US3536379A/en

FWIW, the patent specifies f/5.9 but they certain could have reduced the element sizes slight for f/6.3

Play with it here . You can change 01 to 01U to see the unscaled version.

5.9 and 6.3 are not very far apart.  They could under specify the F/# in a "T#" like way.  Or they are leaving margins for coating, there are quite a few opportunities.

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