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Doc Sharptail
Joined: 23 Nov 2020 Posts: 1216 Location: Winnipeg Canada
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Posted: Tue Nov 22, 2022 9:01 am Post subject: |
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Doc Sharptail wrote:
There's what a factory conversion aperture ring looks like.
My 85mm f1.8 had cross point screws.
-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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stevemark
Joined: 29 Apr 2011 Posts: 4088 Location: Switzerland
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Posted: Tue Nov 22, 2022 7:05 pm Post subject: |
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stevemark wrote:
Doc Sharptail wrote: |
Factory A/I conversion shown above.
I remember the "K" conversion 85mm f1.8 being sold new with this kit installed.
-D.S. |
Interesting - I didn't know that. I have one of those Nikkor "K" 1.8/85mm lenses with said aperture ring kit.
S _________________ www.artaphot.ch |
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visualopsins
Joined: 05 Mar 2009 Posts: 11064 Location: California
Expire: 2025-04-11
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Posted: Tue Nov 22, 2022 8:13 pm Post subject: |
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visualopsins wrote:
Doc Sharptail wrote: |
pics
There's what a factory conversion aperture ring looks like.
...
-D.S. |
Yes, thank you very much! _________________ ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ 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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ZuikosHexanonsandVivitars
Joined: 03 Nov 2021 Posts: 254 Location: Austria
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Posted: Wed Nov 23, 2022 11:13 am Post subject: |
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ZuikosHexanonsandVivitars wrote:
The Nikkor 135mm 1:2 AiS arrived yesterday. Helicoid is a bit stiff, but on the tolerable side. Short and stocky, but well balanced with the adapter on the Sony. First tests indicate, this could become a close friendship.
Comparable in size with the Series 1 Vivitar 135mm f2.3, but heavier.
And of course it dwarfes the Zuiko 135mm f2.8
Some test images. The usual set of flowers and my garden railway under renovation
Btw, those downsized images lose a lot of their original sharpness. A pity...
#1
#2
#3
#4
#5
#6
#7
_________________ Cheers, Gerhard |
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Doc Sharptail
Joined: 23 Nov 2020 Posts: 1216 Location: Winnipeg Canada
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Posted: Wed Nov 23, 2022 5:04 pm Post subject: |
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Doc Sharptail wrote:
Nice lens and images.
I have yet to see one with a reasonable price tag.
Would be interesting to see how one behaves without an adapter e/g: a nikon body of some sort.
I like the last 2 frames- a bit of story telling with the umbrella.
-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: 1438 Location: Kent, UK
Expire: 2025-05-01
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Posted: Wed Nov 23, 2022 8:25 pm Post subject: |
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RokkorDoctor wrote:
Nice one!
I'm sure you will come to like it a lot.
I have an equivalent Minolta MD-III 135/2 which is one of my favourite focal length / speed combos. Very versatile. _________________ 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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stevemark
Joined: 29 Apr 2011 Posts: 4088 Location: Switzerland
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Posted: Thu Nov 24, 2022 12:28 am Post subject: |
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stevemark wrote:
ZuikosHexanonsandVivitars wrote: |
The Nikkor 135mm 1:2 AiS arrived yesterday. ...
Short and stocky, but well balanced with the adapter on the Sony. First tests indicate, this could become a close friendship.
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Yep, the Nikkor AiS 2/135mm is a nice piece of glass indeed. A bit on the heavy side and, as you say, prone to stiff focusing.
Doc Sharptail wrote: |
I have yet to see one with a reasonable price tag.
-D.S. |
About seven years ago - when I bought my own copy - they went for 350-400 CHF here in Switzerland
RokkorDoctor wrote: |
Nice one!
I'm sure you will come to like it a lot.
I have an equivalent Minolta MD-III 135/2 which is one of my favourite focal length / speed combos. Very versatile. |
The three classical 2/135mm from CaMiNi are very similar in their preformance (tested sied-by-side). Bokeh of the three lenses is indistinguishable.
The nFD 2/135mm is the easiest to work with (smooth focusing, less weight). The Nikkor is the heaviest, the Minolta has slighty better corners wide open
(Canon and Nikkor nearly identical). For quite some time the Minolta was the most expensive, but it seems the Canon now also has a rather steep price tag ...
I was lucky to get those lenses long time ago (nFD 2/135mm for CHF 127.-- and CHF 150.--, Minolta MD 2/135mm for 150.-- and 450.--, and Nikkor for about 350.--).
These days I wouldn't buy them any more - especially since much better 2/135mm or 1.8/135mm are available for less, eg a used Zeiss / Sony ZA 1.8/135mm.
S _________________ www.artaphot.ch |
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kansalliskala
Joined: 19 Jul 2007 Posts: 5046 Location: Southern Finland countryside
Expire: 2016-12-30
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Posted: Thu Nov 24, 2022 6:07 am Post subject: |
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kansalliskala wrote:
ZuikosHexanonsandVivitars wrote: |
The Nikkor 135mm 1:2 AiS arrived yesterday.
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Someone at Nikon plant decided to cut part of 180/2.8 away and it worked. _________________ MF: Kodak DCS SLR/c; Samsung NX10; OM-10; Canon T50
Zuiko 28/3.5, Distagon 35/2.8; Yashica ML 50/2;
Zuiko 50/1.4; S-M-C 120/2.8; Zuiko 135/3.5; 200/5;
Tamron AD1 135/2.8, Soligor 180/3.5; Tamron AD1 300/5.6
Tamron zooms: 01A, Z-210
Yashicaflex C; Київ 4 + Юпитер 8, 11; Polaroid 100; Olympus XA; Yashica T3
Museum stuff: Certo-Phot; Tele-Edixon 135; Polaris 90-190; Asahi Bellows; Ixus IIs
Projects: Agfa Isolette III (no shutter), Canon AE-1D (no sensor),
Nikon D80 (dead), The "Peace Camera"
AF: Canon, Tokina, Sigma Video: JVC GZ-MG275E |
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ZuikosHexanonsandVivitars
Joined: 03 Nov 2021 Posts: 254 Location: Austria
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Posted: Thu Nov 24, 2022 1:41 pm Post subject: |
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ZuikosHexanonsandVivitars wrote:
Doc Sharptail wrote: |
Nice lens and images.
I have yet to see one with a reasonable price tag.
Would be interesting to see how one behaves without an adapter e/g: a nikon body of some sort.
I like the last 2 frames- a bit of story telling with the umbrella.
-D.S. |
I think the reasonable price tag times are gone for good. Lucky those folks who started buying long before the hype. However, that with the Nikon body - yes, it might take me some months from now, but sooner or later...
RokkorDoctor wrote: |
Nice one!
I'm sure you will come to like it a lot.
I have an equivalent Minolta MD-III 135/2 which is one of my favourite focal length / speed combos. Very versatile. |
I was lucky I guess. The scratches on the sun shade and the rather stiff going focusing might have had an influence on the price, but the glass is in top condition. Yes, I like it already
stevemark wrote: |
About seven years ago - when I bought my own copy - they went for 350-400 CHF here in Switzerland
The three classical 2/135mm from CaMiNi are very similar in their preformance (tested sied-by-side). Bokeh of the three lenses is indistinguishable.
The nFD 2/135mm is the easiest to work with (smooth focusing, less weight). The Nikkor is the heaviest, the Minolta has slighty better corners wide open
(Canon and Nikkor nearly identical). For quite some time the Minolta was the most expensive, but it seems the Canon now also has a rather steep price tag ...
I was lucky to get those lenses long time ago (nFD 2/135mm for CHF 127.-- and CHF 150.--, Minolta MD 2/135mm for 150.-- and 450.--, and Nikkor for about 350.--).
These days I wouldn't buy them any more - especially since much better 2/135mm or 1.8/135mm are available for less, eg a used Zeiss / Sony ZA 1.8/135mm.
S |
Stefan, your collection seems not much to lack. Enviable
As I said, lucky those guys who started collecting before the hype.
kansalliskala wrote: |
Someone at Nikon plant decided to cut part of 180/2.8 away and it worked. |
Put the Vivitar Series 1 200mm f3 and the 135mm f2.3 next to each other - they had this idea already ten years earlier, but hid it better by cone shaping the barrels
Thanks for your supportive comments. This thing will be fun for long time to come.
Kind Regards, Gerhard _________________ Cheers, Gerhard |
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calvin83
Joined: 12 Apr 2009 Posts: 7587 Location: Hong Kong
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Posted: Thu Nov 24, 2022 2:28 pm Post subject: |
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calvin83 wrote:
Just received this today. My dream Steinheil 50mm.
_________________ The best lens is the one you have with you.
https://lensfever.com/
https://www.instagram.com/_lens_fever/ |
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stevemark
Joined: 29 Apr 2011 Posts: 4088 Location: Switzerland
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Posted: Thu Nov 24, 2022 3:48 pm Post subject: |
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stevemark wrote:
ZuikosHexanonsandVivitars wrote: |
Stefan, your collection seems not much to lack. Enviable
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ZuikosHexanonsandVivitars wrote: |
As I said, lucky those guys who started collecting before the hype.
Kind Regards, Gerhard |
Yeah - originally I started with the MC-X/MD-I series of Minolta Rokkors - later to be expanded to all SLR Rokkors.
At some point the missing Rokkor lenses became too expensive - and since there was plenty of cheap and interesting stuff available
from other manufacturers, I started to buy CaKoniNikon as well. Pentax and Oly are pretty scarce here, but surprisingly I got also lots
of interesting Mamyia lenses. And Yashica stuff and Topcors ... whatever was available at a reasonable price (usually more things
available locally than I could afford ...). TamTok lenses usually came for next to nothing - even a Tamron SP 200-500mm was only 80 CHF ...
There were two photo shops in Bern and Luzern as well which were very helpful: They both often set aside some interesting lenses for me.
Sadly both stores had to close during the pandemic - and they'll not re-open.
My main reason to collect different brands was to be able to counter "fanboy-ism" which was really prevalent around 2010.
Comparing similar vintage MF lenses from all major manufacturers was pretty unheard of back then ...
S _________________ www.artaphot.ch |
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Alun Thomas
Joined: 20 Aug 2018 Posts: 664 Location: New Zealand
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Posted: Thu Nov 24, 2022 8:11 pm Post subject: |
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Alun Thomas wrote:
calvin83 wrote: |
Just received this today. My dream Steinheil 50mm.
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Is that a paxette lens? Whatever it is, I'm jealous... |
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calvin83
Joined: 12 Apr 2009 Posts: 7587 Location: Hong Kong
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Posted: Fri Nov 25, 2022 1:51 am Post subject: |
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calvin83 wrote:
Alun Thomas wrote: |
calvin83 wrote: |
Just received this today. My dream Steinheil 50mm.
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Is that a paxette lens? Whatever it is, I'm jealous... |
It is not made for the Braun Paxette camera. You can see it focus down to 0.6 meter while the Paxette 50mm lens will only focus down to 1 meter. _________________ The best lens is the one you have with you.
https://lensfever.com/
https://www.instagram.com/_lens_fever/ |
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Max78
Joined: 14 Oct 2011 Posts: 80
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Posted: Fri Nov 25, 2022 8:43 am Post subject: |
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Max78 wrote:
calvin83 wrote: |
It is not made for the Braun Paxette camera. You can see it focus down to 0.6 meter while the Paxette 50mm lens will only focus down to 1 meter. |
Nice lens. I think that its real designation is not really known until now. The original Leica LTM version has no protruding rear, can be directly mounted on screw mount Leicas and it also focuses down up to 0.6 m. Some discussion was already here: http://forum.mflenses.com/steinheil-mnchen-quinon-50mm-f2-t80865.html |
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calvin83
Joined: 12 Apr 2009 Posts: 7587 Location: Hong Kong
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Posted: Fri Nov 25, 2022 3:25 pm Post subject: |
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calvin83 wrote:
Max78 wrote: |
calvin83 wrote: |
It is not made for the Braun Paxette camera. You can see it focus down to 0.6 meter while the Paxette 50mm lens will only focus down to 1 meter. |
Nice lens. I think that its real designation is not really known until now. The original Leica LTM version has no protruding rear, can be directly mounted on screw mount Leicas and it also focuses down up to 0.6 m. Some discussion was already here: http://forum.mflenses.com/steinheil-mnchen-quinon-50mm-f2-t80865.html |
I believe it has suken mount which made for use on bellows. _________________ The best lens is the one you have with you.
https://lensfever.com/
https://www.instagram.com/_lens_fever/ |
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KEO
Joined: 27 Sep 2018 Posts: 775 Location: USA
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Posted: Sat Nov 26, 2022 7:05 pm Post subject: |
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KEO wrote:
ZuikosHexanonsandVivitars wrote: |
Doc Sharptail wrote: |
I have yet to see one with a reasonable price tag.
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I think the reasonable price tag times are gone for good. Lucky those folks who started buying long before the hype.
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The price tag on the 135 f/2 Nikkor was what made me decide to get an Apo Sonnar 135 f/2. In the end it wasn't much more expensive.
The 135 f/2 DC Nikkor should also be considered. The manual focus ability of the D-series lenses is just fine. |
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caspert79
Joined: 31 Oct 2010 Posts: 3228 Location: The Netherlands
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Posted: Sat Nov 26, 2022 7:16 pm Post subject: |
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caspert79 wrote:
Minolta Rokkor MC-X 100mm f/2.5 (in later 5/5 configuration).
I recently sold my New MD 100/2.5 because I like more the build quality of the older versions. _________________ 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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RokkorDoctor
Joined: 27 Nov 2021 Posts: 1438 Location: Kent, UK
Expire: 2025-05-01
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Posted: Sat Nov 26, 2022 8:58 pm Post subject: |
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RokkorDoctor wrote:
caspert79 wrote: |
Minolta Rokkor MC-X 100mm f/2.5 (in later 5/5 configuration).
I recently sold my New MD 100/2.5 because I like more the build quality of the older versions. |
Make sure you get a good deep hood for it. All MC and MD I/II versions of the Rokkor 100/2.5 are quite prone to flare and a good deep hood is really compulsory with this lens. The New MD-III version is (or was ) a bit more convenient here with its built-in unusual 2-section telescopic hood.
The original hood (55mm thread) is 45mm deep and 68mm diameter (internal, front) _________________ 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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stevemark
Joined: 29 Apr 2011 Posts: 4088 Location: Switzerland
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Posted: Sat Nov 26, 2022 9:13 pm Post subject: |
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stevemark wrote:
caspert79 wrote: |
Minolta Rokkor MC-X 100mm f/2.5 (in later 5/5 configuration). |
That's one of the 2.5/100mm Minolta lenses I'm still missing.
I have the MC-I, the MC-II, the MC-X [6L], the MD-II and the MD-III (= new MD), but not the MC-X [5L] which well may be the best to use: MC-X lens barrels usually are the nicest, and the [5L] is better than the earlier [6L].
caspert79 wrote: |
I recently sold my New MD 100/2.5 because I like more the build quality of the older versions. |
My MD-III seems to be a tad sharper than my MD-II copy (pixel peeping really). Probably copy variation or maybe better quality control for the later MD-III.
S _________________ www.artaphot.ch |
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vivaldibow
Joined: 23 Jun 2018 Posts: 841
Expire: 2021-03-09
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Posted: Sun Nov 27, 2022 1:18 am Post subject: |
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vivaldibow wrote:
A bunch of lenses including a Sigma xq 100/2.8 macro. Have already had a copy with haze on rear element. Will see how this one goes. Mostly the same. |
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kiddo
Joined: 29 Jun 2018 Posts: 1275
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Posted: Sun Nov 27, 2022 9:49 am Post subject: |
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kiddo wrote:
stevemark wrote: |
caspert79 wrote: |
Minolta Rokkor MC-X 100mm f/2.5 (in later 5/5 configuration). |
That's one of the 2.5/100mm Minolta lenses I'm still missing.
I have the MC-I, the MC-II, the MC-X [6L], the MD-II and the MD-III (= new MD), but not the MC-X [5L] which well may be the best to use: MC-X lens barrels usually are the nicest, and the [5L] is better than the earlier [6L].
caspert79 wrote: |
I recently sold my New MD 100/2.5 because I like more the build quality of the older versions. |
My MD-III seems to be a tad sharper than my MD-II copy (pixel peeping really). Probably copy variation or maybe better quality control for the later MD-III.
S |
What's the difference between md-x 5L (55mm) 1meter and mc-x 5/5? Except build quality of course? |
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kiddo
Joined: 29 Jun 2018 Posts: 1275
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Posted: Sun Nov 27, 2022 10:04 am Post subject: |
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kiddo wrote:
caspert79 wrote: |
Minolta Rokkor MC-X 100mm f/2.5 (in later 5/5 configuration).
I recently sold my New MD 100/2.5 because I like more the build quality of the older versions. |
What version was your MD you've sold? Mine one, the MD-1 (I guess: 5L , 1meter and 55mm) i consider it's got a good build quality, except the grease that's got a bit strong (more than the MC Minolta's ,that are super nice over the years).
On the other hand , would the screwing hood of the MD-1 fitt the MC-X version 55mm? |
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RokkorDoctor
Joined: 27 Nov 2021 Posts: 1438 Location: Kent, UK
Expire: 2025-05-01
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Posted: Sun Nov 27, 2022 12:14 pm Post subject: |
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RokkorDoctor wrote:
kiddo wrote: |
What's the difference between md-x 5L (55mm) 1meter and mc-x 5/5? Except build quality of course? |
On my copies of those two lenses (MD-I vs MC-X, there exists no "MD-X" collectors classification AFAIK) I cannot see any difference other than the obvious cosmetic ones. Both still full metal, both identical build quality as far as I can tell. Even the coatings look the same. I'm not going to take the backs off (again), but I suspect that even the aperture actuation mechanism is still the same, although Minolta did simplify the aperture mechanisms of their lenses over time to reduce the moving mass and overshoot.
kiddo wrote: |
... Mine one, the MD-1 (I guess: 5L , 1meter and 55mm) i consider it's got a good build quality, except the grease that's got a bit strong (more than the MC Minolta's ,that are super nice over the years). |
MC-X minolta lenses with their "super nice" focusing feel so because of the molybdenum disulfide dry-lube residue that is still coating the helicoid threads. In truth, an MC-X lens would have had stiffer focussing when new whilst the base oil had not yet separated out. Earlier MC lenses (and AUTO-ROKKORs) did not have the molybdenum disulfide dry-lube additive and if never serviced can now feel a bit more loose-yet-sticky when focusing as they rely only on a remaining layer of (likely lithium stearate) soap thickener.
kiddo wrote: |
On the other hand , would the screwing hood of the MD-1 fitt the MC-X version 55mm? |
Absolutely. I have both hoods and they are identical apart from the engraved designation. _________________ 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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kiddo
Joined: 29 Jun 2018 Posts: 1275
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Posted: Sun Nov 27, 2022 12:34 pm Post subject: |
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kiddo wrote:
Mark, thank you for your information, in fact ,there is still not a single place to find the whole different details between different versions.
Can we assume that even though smooth to shoot, mc full metal are more prone to have sticky blades/aperture because of the deteriorating grease ? My only full metal that haven't suffered of it yet, is the early 35mm 1.8. I might be wrong though.
To be honest ,for portraits ,this MD-X version i consider too sharp WO, for everything else might be my first choice, of course it depends what is one looking for. |
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RokkorDoctor
Joined: 27 Nov 2021 Posts: 1438 Location: Kent, UK
Expire: 2025-05-01
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Posted: Sun Nov 27, 2022 4:12 pm Post subject: |
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RokkorDoctor wrote:
kiddo wrote: |
Can we assume that even though smooth to shoot, mc full metal are more prone to have sticky blades/aperture because of the deteriorating grease ? |
Not necessarily.
MC lenses are certainly older, so they have had more time for the oil to find its way to the aperture.
A lot also depends on how the aperture assembly is mounted relative to the helicoid assembly. If the path from the helicoid threads to the aperture assembly is short, then it is more likely that oil will find its way onto the blades. The surface energy of the metal components used are high, so oil quite readily migrates along its surface.
Then there are also the usage/storage conditions. Some oil reaches the aperture not by diffusion/creep alone; evaporation and subsequent condensation of the oil is also a factor.
On some lenses Minolta used an oil barrier film (Emralon 325; they call it an "anti-diffusion compound" in their service manual. No longer made and likely a fluorocarbon compound, something like NyeBar from Nye lubricants would likely be a modern alternative). Those lenses are usually OK as far as aperture is concerned. The ROKKOR MC/MD 24mm/2.8 is one of those, for example. _________________ 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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