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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
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stevemark
Joined: 29 Apr 2011
Posts: 4087
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
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simple.joy
Joined: 30 May 2022
Posts: 646
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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.
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caspert79
Joined: 31 Oct 2010
Posts: 3225
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
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Doc Sharptail
Joined: 23 Nov 2020
Posts: 1216
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.
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visualopsins
Joined: 05 Mar 2009
Posts: 11061
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
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Doc Sharptail
Joined: 23 Nov 2020
Posts: 1216
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.
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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: 1436
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
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