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blende8
Joined: 29 Sep 2007
Posts: 260
Location: Bremen, Germany
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 Posted: Thu Nov 17, 2011 2:24 pm Post subject: Question on Pentax smc Takumar 35/3.5 |
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blende8 wrote:
I'm reading in Gerjan v. Oosten's book that the front lens of the 35/3.5 lens is not multicoated.
Why that?
It seems to be an anomaly, otherwise he wouldn't have mentioned it, I presume.
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Best wishes, Wieland
K-1, K-5IIs
Pentax, mysterium quod absconditum fuit ... |
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Keysersoze27
Joined: 19 Feb 2009
Posts: 466
Location: Greece
Expire: 2012-12-24
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| Posted: Thu Nov 17, 2011 2:36 pm Post subject: |
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Keysersoze27 wrote:
Might be that they didn't have the technology back then(or to expensive) to apply coating on a element with such a high curve .
The 2nd element in the front has SMC.
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Canon EOS 5D MkII , EOS 50E, Contax RTS, Olympus OM2n, Nikon Z6ii
28mm: Zeiss Distagon 2.8/28 MMJ
35mm: CZ Distagon 2/35 ZE , S-M-C Takumar 3.5/35
40mm: CZJ Tessar T 4.5/40 1Q
50mm: CZ Planar 1.4/50 MMJ,CZ Planar 1.7/50 AEJ+MMJ,Leica Summicron 2/50 v3,S-M-C Takumar 1.4/50,Pentax SMC 1.4/50 K,Pentax SMC 1.8/55 K,Nikkor 1.8/50 ,CZJ Tessar T 3.5/50 1Q , CZ Planar 1.8/50 (QBM),Zuiko 1.4/50, Zuiko 1.8/50, Icarex Tessar 2.8/50, Nikkor 2/50 Ai,Schneider Kreuznach Xenar 2.8/50 Preset, Pentacon Prakticar 2.4/50 MC v1, CZJ Pancolar 1.8/50 Zebra , Rikenon 1.4/50 P
55mm: Fujinon 1.8/55 EBC
58mm: Helios MC 44-3 2/58
85mm: Zeiss Sonnar 2.8/85 AEJ
90mm: Voigtl�nder APO-Lanthar 3.5/90 SLII , Leica Elmarit-R 2.8/90 v2
100~105mm:Zeiss Sonnar 3.5/100 MM, Nikkor 2.5/105 AiS, S-M-C Takumar 2.8/105
135mm: Leica Elmarit R 2.8/135 v2, S-M-C Takumar 3.5/135, CZJ 4/135 Sonnar Exakta leatherette (1963),CZJ 4/135 Triotar
Macro:Leica Macro-Elmarit R 2.8/60, Micro-Nikkor Auto 3.5/55 Compensating type (1964) |
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Spotmatic
Joined: 18 Aug 2008
Posts: 4045
Location: Netherlands
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| Posted: Thu Nov 17, 2011 3:15 pm Post subject: |
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Spotmatic wrote:
Actually Gerjan explained it in one of his articles for the Dutch Camera Magazine. In short: due to the strong curvature of the front element the thick SMC coating would have an adverse effect on the light rays entering the front element in a sharp angle. That is why a thinner coating was used on the front element.
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Peter - Moderator
Pentax K-5 + Pentax 645 + Canon 5D + Bessa RF 10,5cm Heliar, and a 'little' bag full of MF lenses. The lens list is * here *.
My fast 80s: Asahi-Kogaku Takumar 83mm f/1.9 - Super-Takumar 85mm f/1.9 - FA 77mm f/1.8 Limited - Cyclop 85/1.5 (Helios-40 innards) - Komura 80mm f/1.8 - Meyer Görlitz Primoplan 7,5cm 1:1.9 - Carl Zeiss Jena 80mm f/1.8 Pancolar - Canon 85mm f/1.8 S.S.C. - Canon 85mm f/1.2 S.S.C. Aspherical |
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blende8
Joined: 29 Sep 2007
Posts: 260
Location: Bremen, Germany
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| Posted: Thu Nov 17, 2011 4:36 pm Post subject: |
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blende8 wrote:
Aha! Thank you!
I already thought about something to that effect.
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Best wishes, Wieland
K-1, K-5IIs
Pentax, mysterium quod absconditum fuit ... |
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visualopsins
Joined: 05 Mar 2009
Posts: 10960
Location: California
Expire: 2025-04-11
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| Posted: Thu Nov 17, 2011 5:50 pm Post subject: |
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visualopsins wrote:
Yes Thank You indeed for that bit of information. The thought that multi-coating on curved front elements could actually block light from a subject had been bothering me for some time.
I think that multi-coating of highly curved interior lens surfaces has no such "adverse effect", because light enters and exits those surfaces at right angle.
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☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ 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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