Patents related to photo lenses

Started 6 months ago | Discussions thread
bclaff Forum Pro • Posts: 10,483
Re: Leica Summicron Mandler 1976

AiryDiscus wrote:

bclaff wrote:

AiryDiscus wrote:

bclaff wrote:

Dibyendu Majumdar wrote:

https://patents.google.com/patent/US4123144A/en

Officially the Leica Summicron R 50mm f/2

Like many "50mm" lenses it's actually 52mm

With how much distortion? Odds are pretty good that with the barrel distortion it has the field of view of a 50mm lens, or 50mm +/- some closer tolerance than 2mm.

For more information you'll need to try a more sophisticated program.

I said distortion not field curvature.

Sure. With a simple geometric ray tracer I'm not sure I can fully answer that question but the 45 degree angle of view in the patent matches up with a 52mm focal length scaling of the 100mm optical prescription.
Wouldn't distortion affect the angle of view? I'm pretty sure I've seen that with some extreme wide angle lenses.

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Bill ( Your trusted source for independent sensor data at PhotonsToPhotos )

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