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screwunscrew
Joined: 20 Nov 2011 Posts: 59 Location: Äsch, Switzerland
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Posted: Fri Aug 11, 2017 12:27 pm Post subject: Clip-on and D-mount Wollensak 1½ inch f/3.5 cine telephoto |
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screwunscrew wrote:
The Wollensak Cine Telephoto lens of 1½ inches focal length for Bell & Howell Filmo 8s, also sold as Bell & Howell Telate, is a triplet. The less satisfying punch-through diaphragm leaves again. Pinching threaded bushes and nothing to secure the lens from being screwed apart, a mess. This one cost me $13 with eBay.
$42 in 1948, $426.89 as of today. When bought from the Bell & Howell Company, the price was $46 in 1940, $804.85 today. Theft.
I shall report about other ciné lenses, better ones, also cheaply available now. Not that it were impossible to shoot with Wollensak lenses, but after all these years we must have a closer look at the mechanics and what future they probably have. One could of course stamp fresh diaphragm leaves from spring steel stock, press in pivots, harden and anneal them, and thus breathe new life into such a lens. I won’t do that, just CLA. |
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visualopsins
Joined: 05 Mar 2009 Posts: 10543 Location: California
Expire: 2025-04-11
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Posted: Sat Sep 02, 2017 2:16 am Post subject: |
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visualopsins wrote:
Good work _________________ ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ 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 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 (51BB), 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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Negens
Joined: 09 Oct 2017 Posts: 27
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Posted: Sun Oct 15, 2017 3:28 am Post subject: |
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Negens wrote:
Hello,
Can you tell me how many glass elements are in front. I'd like to clean mine but I'd prefer now more about its architecture before.
Thanks ! |
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screwunscrew
Joined: 20 Nov 2011 Posts: 59 Location: Äsch, Switzerland
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Posted: Fri Oct 20, 2017 9:03 am Post subject: |
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screwunscrew wrote:
Negens, you don’t read too carefully, do you? It’s a triplet.
https://en.wikipedia.org/wiki/Triplet_lens |
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Negens
Joined: 09 Oct 2017 Posts: 27
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Posted: Fri Oct 20, 2017 9:16 pm Post subject: |
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Negens wrote:
Sorry, it's just that I am a newbie in lens conceptions and disassembly.
Thanks for the link.
I should have precise my question : Is there a doublet group in the front element ? I ever broke a rear doublet group in a triplet lens, because I was not prepared to encounter a doublet group.
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screwunscrew
Joined: 20 Nov 2011 Posts: 59 Location: Äsch, Switzerland
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Posted: Mon Oct 23, 2017 6:08 am Post subject: |
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screwunscrew wrote:
Excuse me for becoming quite uninhibited but you are stubborn.
Despite the Wikipedia article with its drawings you presume more than three elements.
No, a triplet is a three-elements system. No doublets, no achromats, three separate, distinct pieces of glass
https://en.wikipedia.org/wiki/Cooke_triplet |
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Negens
Joined: 09 Oct 2017 Posts: 27
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Posted: Mon Oct 23, 2017 4:35 pm Post subject: |
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Negens wrote:
I would not be stubborn if I had not experienced that : If I broke the rear glass of the Wollensak 6.5mm f/1.9 D-mount , it's because it has two joint glasses like in the Tessar and Heliar lenses. One of the two joint glasses broke in three pieces on the ground as I tried to catch it from falling.
Tessar : improved from the Cooke-triplet
Heliar : improved from the Tessar
I just want to be sure that Wollensak did not use Heliar structure in some lenses because if they did, I have to be more careful with the front elements.
And from the bad experience I had disassembling the 6.5mm, they could have. |
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screwunscrew
Joined: 20 Nov 2011 Posts: 59 Location: Äsch, Switzerland
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Posted: Tue Oct 24, 2017 6:03 am Post subject: |
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screwunscrew wrote:
This thread is about a telephoto lens. Long focal length lenses almost invariably are of simpler design than normal and especially retrofocus wide angle lenses. A telephoto triplet does not need to contain an achromat. Different story with your 6.5 mm, please read about retrofocal designs. https://www.lensrentals.com/blog/2011/03/the-development-of-wide-angle-lenses/ |
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Negens
Joined: 09 Oct 2017 Posts: 27
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Posted: Tue Oct 24, 2017 6:11 am Post subject: |
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Negens wrote:
OK, thanks |
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