Patents related to photo lenses

Started 7 months ago | Discussions
Dibyendu Majumdar Contributing Member • Posts: 766
Patents related to photo lenses

Hi,

Starting a new thread - not specific to Nikon lenses unlike the previous threads here and elsewhere (see https://www.dpreview.com/forums/post/63122995).

OP Dibyendu Majumdar Contributing Member • Posts: 766
Leica SL 50mm f1.4 by Konica Minolta?
OP Dibyendu Majumdar Contributing Member • Posts: 766
The famous Noctilux 50mm f1.2

This was world's first 35mm lens with aspherical elements - two of them!

https://patents.google.com/patent/US3459468A/en

Also see:

https://www.pacificrimcamera.com/rl/00307/00307.pdf

OP Dibyendu Majumdar Contributing Member • Posts: 766
Leitz 800mm f6.3

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

OP Dibyendu Majumdar Contributing Member • Posts: 766
Sonnar® T* FE 55 mm F1.8 ZA Designed by Sony not Zeiss?
OP Dibyendu Majumdar Contributing Member • Posts: 766
Canon RF 50mm f1.2
OP Dibyendu Majumdar Contributing Member • Posts: 766
Sigma ART 35mm f1.2 for mirrorless
OP Dibyendu Majumdar Contributing Member • Posts: 766
Sigma ART 70mm f2.8 Macro
OP Dibyendu Majumdar Contributing Member • Posts: 766
Sigma ART 105mm f1.4
OP Dibyendu Majumdar Contributing Member • Posts: 766
Sigma ART 50mm f1.4
OP Dibyendu Majumdar Contributing Member • Posts: 766
Sigma ART 35mm f1.4
OP Dibyendu Majumdar Contributing Member • Posts: 766
Canon EF 50mm f1.0L
OP Dibyendu Majumdar Contributing Member • Posts: 766
Leica Summicron Mandler 1976
bclaff Forum Pro • Posts: 10,577
Re: Leica SL 50mm f1.4 by Konica Minolta?
2

Dibyendu Majumdar wrote:

https://uk.leica-camera.com/Photography/Leica-SL/SL-Lenses/Prime-Lenses/SUMMILUX-SL-50

This patent by Konica Minolta appears to be related if not an exact match:

https://patents.google.com/patent/US10302898B2/en

Definitely no.

Or maybe this one:

https://patents.google.com/patent/EP3136147A1/en

Not perfect but close enough From the PhotonsToPhotos Optical Bench:

Best viewed "original size"

Patent optical prescription (Example 1) over the Leica lens construction diagram.

Here the link: Leica Summilux-SL 50 f/1.4 ASPH

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

bclaff Forum Pro • Posts: 10,577
Re: Leitz 800mm f6.3
1

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.

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

OP Dibyendu Majumdar Contributing Member • Posts: 766
Re: Leitz 800mm f6.3

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.

Nice - the link may be incorrect?

I am attaching some info that might help fine tune:

Alsop this link:

https://www.l-camera-forum.com/leica-wiki.en/index.php/800mm_f/6.3_Telyt-S

bclaff Forum Pro • Posts: 10,577
Re: Leitz 800mm f6.3
1

Dibyendu Majumdar wrote:

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.

Nice - the link may be incorrect?

My bad. I forgot to hand edit the link. It should be this .

I am attaching some info that might help fine tune:

Alsop this link:

https://www.l-camera-forum.com/leica-wiki.en/index.php/800mm_f/6.3_Telyt-S

Thanks. I used that construction diagram to make a 'P' version for publication.

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

bclaff Forum Pro • Posts: 10,577
Re: Sigma ART 35mm f1.4

Dibyendu Majumdar wrote:

https://patents.google.com/patent/JP2014048488A/en

I already had this one, which is a perfect fit:

link

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

bclaff Forum Pro • Posts: 10,577
Re: Sigma ART 50mm f1.4

Dibyendu Majumdar wrote:

https://patents.google.com/patent/JP2015114366A/en

This fit was no so good as most:

Link .

I've decided this is not a fit for my purposes.

In addition to not matching the construction diagram the patent has an aspherical element whereas the lens does not. 

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

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