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Gerald
Joined: 25 Mar 2014 Posts: 1197 Location: Brazil
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Posted: Sun Nov 17, 2024 12:25 pm Post subject: The process of making a camera lens |
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Gerald wrote:
I don't know if people here already know this relatively recent video that shows the manufacturing of lenses at Sigma:
https://www.youtube.com/watch?v=r5HFLkNrbIU _________________ If raindrops were perfect lenses, the rainbow did not exist. |
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stevemark
Joined: 29 Apr 2011 Posts: 4101 Location: Switzerland
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Posted: Sun Nov 17, 2024 1:10 pm Post subject: |
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stevemark wrote:
Interesting and kind of mind-blowing if we think about all the ingenuity not only going into the construction of the optics & barrel, but also the into the machines used for production!
Another interesting film - probably from the 1950s - about Kodak manufacturing optical glass and lenses:
https://www.youtube.com/watch?v=GHOHbUKWBZs
S _________________ www.artaphot.ch |
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simple.joy
Joined: 30 May 2022 Posts: 661
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Posted: Sun Nov 17, 2024 3:56 pm Post subject: Re: The process of making a camera lens |
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simple.joy wrote:
It's very impressive - thanks for the link! Robert OToole has always been full of praise and appreciation for Sigma, because he mentioned they were one of only a handful of lens manufacturers who were still able to make the whole lens in-house (including making and grinding the glass), while all of the big names (including Sony, Canon and Nikon if I remember correctly) had to outsource quite a bit of it, in parts even let others (like Tamron or Cosina) make the whole lenses for them. It's incredible how much technology and know-how goes into the development of such a lens...
I still find historical lenses even more impressive given the lack of complex automated processes, computer calculation and simulations and complex inspection techniques. But of course the lenses were also simpler at that time. _________________ ---
Manual lens enthusiast
https://www.flickr.com/photos/simple_joy/ |
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caspert79
Joined: 31 Oct 2010 Posts: 3247 Location: The Netherlands
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Posted: Sun Nov 17, 2024 3:57 pm Post subject: |
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caspert79 wrote:
Very interesting guys! Did I share this one before of the Cosina Voigtlander factory?
https://www.youtube.com/watch?v=Voo3pCvYODI _________________ For Sale:
Steinheil Auto D Tele Quinar 135mm f/2.8 (Exa)
ISCO Isconar 100mm f/4 (Exa)
Steinheil Cassarit 50mm f/2.8 M39 (Paxette)
I'm always interested in trading lenses! |
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Doc Sharptail
Joined: 23 Nov 2020 Posts: 1228 Location: Winnipeg Canada
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Posted: Sun Nov 17, 2024 5:23 pm Post subject: |
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Doc Sharptail wrote:
This should be stickied somewhere near here...
-D.S. _________________
D-810, F2, FTN.
35mm f2 O.C. nikkor
50 f2 H nikkor, 50 f 1.4 AI-s, 135 f3.5 Q,
50 f2 K nikkor 2x, 28-85mm f3.5-4.5 A/I-s, 35-105 3.5-4.5 A/I-s, 200mm f4 Micro A/I, partial list.
"Ain't no half-way" -S.R.V.
"Oh Yeah... Alright" -Paul Simon |
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visualopsins
Joined: 05 Mar 2009 Posts: 11097 Location: California
Expire: 2025-04-11
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Posted: Sun Nov 17, 2024 6:29 pm Post subject: |
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visualopsins wrote:
Doc Sharptail wrote: |
This should be stickied somewhere near here...
-D.S. |
done _________________ ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ like attracts like! ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮
Cameras: Sony ILCE-7RM2, Spotmatics II, F, and ESII, Nikon P4
Lenses:
M42 Asahi Optical Co., Takumar 1:4 f=35mm, 1:2 f=58mm (Sonnar), 1:2.4 f=58mm (Heliar), 1:2.2 f=55mm (Gaussian), 1:2.8 f=105mm (Model I), 1:2.8/105 (Model II), 1:5.6/200, Tele-Takumar 1:5.6/200, 1:6.3/300, Macro-Takumar 1:4/50, Auto-Takumar 1:2.3 f=35, 1:1.8 f=55mm, 1:2.2 f=55mm, Super-TAKUMAR 1:3.5/28 (fat), 1:2/35 (Fat), 1:1.4/50 (8-element), Super-Multi-Coated Fisheye-TAKUMAR 1:4/17, Super-Multi-Coated TAKUMAR 1:4.5/20, 1:3.5/24, 1:3.5/28, 1:2/35, 1:3.5/35, 1:1.8/85, 1:1.9/85 1:2.8/105, 1:3.5/135, 1:2.5/135 (II), 1:4/150, 1:4/200, 1:4/300, 1:4.5/500, Super-Multi-Coated Macro-TAKUMAR 1:4/50, 1:4/100, Super-Multi-Coated Bellows-TAKUMAR 1:4/100, SMC TAKUMAR 1:1.4/50, 1:1.8/55
M42 Carl Zeiss Jena Flektogon 2.4/35
Contax Carl Zeiss Vario-Sonnar T* 28-70mm F3.5-4.5
Pentax K-mount SMC PENTAX-A ZOOM 1:3.5 35~105mm, SMC PENTAX ZOOM 1:4 45~125mm
Nikon Micro-NIKKOR-P-C Auto 1:3.5 f=55mm, NIKKOR-P Auto 105mm f/2.5 Pre-AI (Sonnar), Micro-NIKKOR 105mm 1:4 AI, NIKKOR AI-S 35-135mm f/3,5-4,5
Tamron SP 17mm f/3.5 (51B), Tamron SP 17mm f/3.5 (151B), SP 500mm f/8 (55BB), SP 70-210mm f/3.5 (19AH)
Vivitar 100mm 1:2.8 MC 1:1 Macro Telephoto (Kiron)
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Doc Sharptail
Joined: 23 Nov 2020 Posts: 1228 Location: Winnipeg Canada
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Posted: Sun Nov 17, 2024 6:44 pm Post subject: |
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Doc Sharptail wrote:
There was a video circulating around of lens polishing in the nikon factory that I can't find now..
-D.S. _________________
D-810, F2, FTN.
35mm f2 O.C. nikkor
50 f2 H nikkor, 50 f 1.4 AI-s, 135 f3.5 Q,
50 f2 K nikkor 2x, 28-85mm f3.5-4.5 A/I-s, 35-105 3.5-4.5 A/I-s, 200mm f4 Micro A/I, partial list.
"Ain't no half-way" -S.R.V.
"Oh Yeah... Alright" -Paul Simon |
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RokkorDoctor
Joined: 27 Nov 2021 Posts: 1445 Location: Kent, UK
Expire: 2025-05-01
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Posted: Sun Nov 17, 2024 8:58 pm Post subject: Re: The process of making a camera lens |
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RokkorDoctor wrote:
Three points of interest showing the use of long-established lens manufacturing techniques & tools:
4:03 in the video shows use of a spherometer. A spherometer is a mechanical device to determine the radius of a sphere. In this example it has been calibrated to show deviation from a predetermined diameter, i.e. if the dial shows a zero reading = perfect:
https://youtu.be/r5HFLkNrbIU?si=_iLZr1rGNgBj39ss&t=243
https://en.wikipedia.org/wiki/Spherometer
5:37 shows use of an optical reference; light shone through a sandwich of two optical surfaces in very close contact shows rings of interference (Newton rings). Each additional band corresponds to approx. 0.25 microns or 2500 Angstrom away from the reference surface (or approx 0.35 microns when using red light). This also shows elliptical (astigmatic) errors which a spherometer cannot identify:
https://youtu.be/r5HFLkNrbIU?si=-wNSjY2wZ5RHbXG6&t=337
https://en.wikipedia.org/wiki/Newton%27s_rings
6:27 I think shows an example of bell centering; the curvature of the lens is used when clamped between two metal centering bells allowing it to self-centre prior to being edge-ground to have the optical and mechanical centres aligned:
https://youtu.be/r5HFLkNrbIU?si=b3Xx5tvOp2vFzs0r&t=387
https://www.edmundoptics.com/knowledge-center/application-notes/optics/tips-for-designing-manufacturable-lenses-and-assemblies/
EDIT: in addition to the various videos mentioned above by the other members, there is also this CANON trio on YouTube:
Canon Lens Production 1: https://youtu.be/MKNFW0YwDYw
Canon Lens Production 2: https://youtu.be/qzpt49qq6v4
Canon Lens Production 3: https://youtu.be/6bQ3-DWh-rA _________________ Mark
SONY A7S, A7RII + dust-sealed modded Novoflex/Fotodiox/Rayqual MD-NEX adapters
Minolta SR-1, SRT-101/303, XD7/XD11, XGM, X700
Bronica SQAi
Ricoh GX100
Minolta majority of all Rokkor SR/AR/MC/MD models made
Sigma 14mm/3.5 for SR mount
Tamron SP 60B 300mm/2.8 (Adaptall)
Samyang T-S 24mm/3.5 (Nikon mount, DIY converted to SR mount)
Schneider-Kreuznach PC-Super-Angulon 28mm/2.8 (SR mount)
Bronica PS 35/40/50/65/80/110/135/150/180/200/250mm |
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visualopsins
Joined: 05 Mar 2009 Posts: 11097 Location: California
Expire: 2025-04-11
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Posted: Sun Dec 01, 2024 10:39 pm Post subject: |
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visualopsins wrote:
Smartphone Camera Lens Design: A Patent Study https://www.youtube.com/watch?v=1aCXMBP8_3I _________________ ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ like attracts like! ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮
Cameras: Sony ILCE-7RM2, Spotmatics II, F, and ESII, Nikon P4
Lenses:
M42 Asahi Optical Co., Takumar 1:4 f=35mm, 1:2 f=58mm (Sonnar), 1:2.4 f=58mm (Heliar), 1:2.2 f=55mm (Gaussian), 1:2.8 f=105mm (Model I), 1:2.8/105 (Model II), 1:5.6/200, Tele-Takumar 1:5.6/200, 1:6.3/300, Macro-Takumar 1:4/50, Auto-Takumar 1:2.3 f=35, 1:1.8 f=55mm, 1:2.2 f=55mm, Super-TAKUMAR 1:3.5/28 (fat), 1:2/35 (Fat), 1:1.4/50 (8-element), Super-Multi-Coated Fisheye-TAKUMAR 1:4/17, Super-Multi-Coated TAKUMAR 1:4.5/20, 1:3.5/24, 1:3.5/28, 1:2/35, 1:3.5/35, 1:1.8/85, 1:1.9/85 1:2.8/105, 1:3.5/135, 1:2.5/135 (II), 1:4/150, 1:4/200, 1:4/300, 1:4.5/500, Super-Multi-Coated Macro-TAKUMAR 1:4/50, 1:4/100, Super-Multi-Coated Bellows-TAKUMAR 1:4/100, SMC TAKUMAR 1:1.4/50, 1:1.8/55
M42 Carl Zeiss Jena Flektogon 2.4/35
Contax Carl Zeiss Vario-Sonnar T* 28-70mm F3.5-4.5
Pentax K-mount SMC PENTAX-A ZOOM 1:3.5 35~105mm, SMC PENTAX ZOOM 1:4 45~125mm
Nikon Micro-NIKKOR-P-C Auto 1:3.5 f=55mm, NIKKOR-P Auto 105mm f/2.5 Pre-AI (Sonnar), Micro-NIKKOR 105mm 1:4 AI, NIKKOR AI-S 35-135mm f/3,5-4,5
Tamron SP 17mm f/3.5 (51B), Tamron SP 17mm f/3.5 (151B), SP 500mm f/8 (55BB), SP 70-210mm f/3.5 (19AH)
Vivitar 100mm 1:2.8 MC 1:1 Macro Telephoto (Kiron)
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