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KEO
Joined: 27 Sep 2018 Posts: 756 Location: USA
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Posted: Thu Jun 06, 2019 7:07 pm Post subject: M42 Mount Question |
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KEO wrote:
I have an old ISCO lens that fits my M42 adapter perfectly and hits infinity perfectly, but when it's screwed in all the way the lens is upside-down; in other words, the focus and aperture numbers and hash-marks are on the bottom (toward the tripod mount), and the "Made In Germany" text it on top (toward the hot shoe). Needless to say, this is a bit inconvenient.
It really doesn't bother me that much, but it always makes me wonder which camera or cameras the lens was made for. I assume there must be some old cameras with M42 mounts rotated 180 degrees, and I figured I would ask here since I don't know. I'm also wondering whether or not there are special adapters for mounts like this. If not I might just make one myself.
Thanks. |
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bkwphoto
Joined: 29 Jul 2013 Posts: 8 Location: usa
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Posted: Thu Jun 06, 2019 7:32 pm Post subject: |
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bkwphoto wrote:
Look at your m42 adapter to see if it is adjustable. My fotasy m42 adapters are. There are three very tiny hex screws that you loosen to turn the lens to the proper position. I ordered this hex set Wiha 35392 5 Piece Mini L-Key Short Hex Metric Set. The one I needed was the 1.3.
I used my lenses for a while before I stumbled upon this answer.
Brian _________________ BKW |
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KEO
Joined: 27 Sep 2018 Posts: 756 Location: USA
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Posted: Thu Jun 06, 2019 7:34 pm Post subject: |
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KEO wrote:
bkwphoto wrote: |
Look at your m42 adapter to see if it is adjustable. My fotasy m42 adapters are. There are three very tiny hex screws that you loosen to turn the lens to the proper position. I ordered this hex set Wiha 35392 5 Piece Mini L-Key Short Hex Metric Set. The one I needed was the 1.3.
I used my lenses for a while before I stumbled upon this answer.
Brian |
Thanks, Brian. I will do that. |
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visualopsins
Joined: 05 Mar 2009 Posts: 10463 Location: California
Expire: 2021-06-22
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Posted: Thu Jun 06, 2019 8:53 pm Post subject: |
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visualopsins wrote:
Assuming other M42 lenses mount on the adapter with correct orientation, perhaps lens has been put back together with mount upside down. I've never heard of native upside-down M42 mounting camera. _________________ ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ like attracts like! ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮
Cameras: Sony A7Rii, Spotmatics II, F, and ESII, Nikon P4
M42 Asahi Optical Co., Lenses:
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
Other lenses:
Carl Zeiss Jena Flektogon 2.4/35
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
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luisalegria
Joined: 07 Mar 2008 Posts: 6627 Location: San Francisco, USA
Expire: 2018-01-18
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Posted: Thu Jun 06, 2019 9:18 pm Post subject: |
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luisalegria wrote:
Edixa had a unique version of the M42 mount.
I think the thread was deliberately slightly skewed.
And the pin was in a different orientation from standard M42.
Not so much as to mount it upside down though. _________________ I like Pentax DSLR's, Exaktas, M42 bodies of all kinds, strange and cheap Japanese lenses, and am dabbling in medium format/Speed Graphic work. |
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DConvert
Joined: 12 Jun 2010 Posts: 901 Location: Essex UK
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Posted: Thu Jun 06, 2019 9:25 pm Post subject: |
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DConvert wrote:
visualopsins wrote: |
Assuming other M42 lenses mount on the adapter with correct orientation, perhaps lens has been put back together with mount upside down. I've never heard of native upside-down M42 mounting camera. |
All the M42 lenses I've mounted on M42 cameras have always been correctly oriented but many (all?) of them are wrong on (many?) adapters. I think less than half my M42 adapters have any facility for correcting the alignment
If the cameras are all made the same using 1960s machining tools why can't adapters be done right with today's higher quality tools? |
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Sciolist
Joined: 29 Mar 2017 Posts: 1445 Location: Scotland
Expire: 2021-04-16
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Posted: Thu Jun 06, 2019 9:40 pm Post subject: |
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Sciolist wrote:
bkwphoto wrote: |
Look at your m42 adapter to see if it is adjustable. My fotasy m42 adapters are. There are three very tiny hex screws that you loosen to turn the lens to the proper position. I ordered this hex set Wiha 35392 5 Piece Mini L-Key Short Hex Metric Set. The one I needed was the 1.3.
I used my lenses for a while before I stumbled upon this answer.
Brian |
+1 with K&F adapters. |
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visualopsins
Joined: 05 Mar 2009 Posts: 10463 Location: California
Expire: 2021-06-22
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Posted: Thu Jun 06, 2019 10:08 pm Post subject: |
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visualopsins wrote:
DConvert wrote: |
visualopsins wrote: |
Assuming other M42 lenses mount on the adapter with correct orientation, perhaps lens has been put back together with mount upside down. I've never heard of native upside-down M42 mounting camera. |
All the M42 lenses I've mounted on M42 cameras have always been correctly oriented but many (all?) of them are wrong on (many?) adapters. I think less than half my M42 adapters have any facility for correcting the alignment
If the cameras are all made the same using 1960s machining tools why can't adapters be done right with today's higher quality tools? |
Yes wrong on many adapters in my experience also, with no adjustments, except if lens turns past top orientation, a shim between adapter and lens can correct that, without effect on infinity capability if lens typically focuses past infinity.
Critical is thread-cutting starting point in relation to camera side orientation. Seems like that would be easy today's tools.
Anybody know where to find adjustable M42 adapters? _________________ ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ like attracts like! ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮
Cameras: Sony A7Rii, Spotmatics II, F, and ESII, Nikon P4
M42 Asahi Optical Co., Lenses:
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
Other lenses:
Carl Zeiss Jena Flektogon 2.4/35
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
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kypfer
Joined: 27 Sep 2017 Posts: 513 Location: Jersey C.I.
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Posted: Fri Jun 07, 2019 7:27 am Post subject: |
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kypfer wrote:
Lens skewing can be an annoyance.
On my Pentax DSLRs I've found only a Pentax original M42-PK adaptor will reliably mount any M42 lens (and I've got quite a drawer-full) in more-or-less the "proper" orientation. Unfortunately these adaptors appear to be no longer available from the manufacturers and they demand a premium price on the second-hand market. They are, however, very well made!
Lenses that were originally designed to lock onto their respective bodies, Fujinons for instance, will usually screw in just a little bit further than one might like, as the lock is no longer there to restrict the travel.
The only lens I've got where it's at all important is my early Sigma 21-35mm with it's built-in "petal" lens hood. Fortunately it's a well-made lens and sits perfectly with a Pentax adaptor
For my Samsung NX the M42 adaptor has the little screws to allow perfect alignment, if so desired. |
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Oldhand
Joined: 01 Apr 2013 Posts: 6006 Location: Mid North Coast NSW - Australia
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Posted: Fri Jun 07, 2019 7:40 am Post subject: |
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Oldhand wrote:
bkwphoto wrote: |
Look at your m42 adapter to see if it is adjustable. My fotasy m42 adapters are. There are three very tiny hex screws that you loosen to turn the lens to the proper position. I ordered this hex set Wiha 35392 5 Piece Mini L-Key Short Hex Metric Set. The one I needed was the 1.3.
I used my lenses for a while before I stumbled upon this answer.
Brian |
Exactly.
I have a K&F Concept adapter and it is adjustable in exactly the same way.
A simple fix really
Tom
PS I notice that Sciolist has already mentioned this.
Whoops
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visualopsins
Joined: 05 Mar 2009 Posts: 10463 Location: California
Expire: 2021-06-22
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Posted: Fri Jun 07, 2019 8:33 am Post subject: |
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visualopsins wrote:
Oldhand wrote: |
bkwphoto wrote: |
Look at your m42 adapter to see if it is adjustable. My fotasy m42 adapters are. There are three very tiny hex screws that you loosen to turn the lens to the proper position. I ordered this hex set Wiha 35392 5 Piece Mini L-Key Short Hex Metric Set. The one I needed was the 1.3.
I used my lenses for a while before I stumbled upon this answer.
Brian |
Exactly.
I have a K&F Concept adapter and it is adjustable in exactly the same way.
A simple fix really
Tom
PS I notice that Sciolist has already mentioned this.
Whoops
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Yes, whoops! Thanks Sciolist & Oldhand! _________________ ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ like attracts like! ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮
Cameras: Sony A7Rii, Spotmatics II, F, and ESII, Nikon P4
M42 Asahi Optical Co., Lenses:
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
Other lenses:
Carl Zeiss Jena Flektogon 2.4/35
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
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KEO
Joined: 27 Sep 2018 Posts: 756 Location: USA
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Posted: Fri Jun 07, 2019 10:04 pm Post subject: |
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KEO wrote:
Thanks for all the information, guys!
The (M42-FX) adapter I'm using in this case is a Fotasy with a macro helicoid. I use lots of other lenses with it with no problem.
The problem only seems to occur when I mount my Isco 100mm Isconar 4.5. It's a fantastic lens, but it has a number of oddities. The filter thread is an unusual 41mm (iirc) and the ergonomics are unusual too: a big aperture ring behind a very small focus ring near the front. It feels very backwards and requires some getting used to.
I don't think it's been reassembled incorrectly. It's such an incredibly simple triplet design I believe I'd be able to tell, as would anyone else. Old silver Isco lenses are probably the most mechanically simple designs I've seen. The body and the mount are one single piece of tube-shaped metal.
That's why I'm wondering if the upside-down mounting was made for a specific camera line. I will keep researching. |
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DConvert
Joined: 12 Jun 2010 Posts: 901 Location: Essex UK
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Posted: Fri Jun 07, 2019 10:10 pm Post subject: |
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DConvert wrote:
There are of course also T2 lenses which can have M42 adapters fitted. These adapters are usually adjustable for orientation. Is that the case for your Isco? |
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visualopsins
Joined: 05 Mar 2009 Posts: 10463 Location: California
Expire: 2021-06-22
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Posted: Fri Jun 07, 2019 10:46 pm Post subject: |
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visualopsins wrote:
Search Google images for that lens. Look for one showing it mounted on a camera. Compare how yours looks... _________________ ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ like attracts like! ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮
Cameras: Sony A7Rii, Spotmatics II, F, and ESII, Nikon P4
M42 Asahi Optical Co., Lenses:
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
Other lenses:
Carl Zeiss Jena Flektogon 2.4/35
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
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jamaeolus
Joined: 19 Mar 2014 Posts: 2913 Location: Eugene
Expire: 2015-08-20
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Posted: Mon Jun 10, 2019 4:43 pm Post subject: |
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jamaeolus wrote:
One of my very first mfl was an aluminum isconar 100mm 4.5. Mine was exakta mount though. Delightful little thing. Do you get ghosting with the fotasy helical? I have some pixco adapters that are seriously problematic with certain lenses. _________________ photos are moments frozen in time |
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visualopsins
Joined: 05 Mar 2009 Posts: 10463 Location: California
Expire: 2021-06-22
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Posted: Mon Jun 10, 2019 5:52 pm Post subject: |
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visualopsins wrote:
KEO wrote: |
...
I don't think it's been reassembled incorrectly. It's such an incredibly simple triplet design I believe I'd be able to tell, as would anyone else. Old silver Isco lenses are probably the most mechanically simple designs I've seen. The body and the mount are one single piece of tube-shaped metal.
That's why I'm wondering if the upside-down mounting was made for a specific camera line. I will keep researching. |
Ahem, there are here, elsewhere, and have been, many, who are able to take apart that lens completely and put it back together so well nobody could ever discern it has been worked upon, yes? _________________ ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ like attracts like! ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮
Cameras: Sony A7Rii, Spotmatics II, F, and ESII, Nikon P4
M42 Asahi Optical Co., Lenses:
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
Other lenses:
Carl Zeiss Jena Flektogon 2.4/35
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
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KEO
Joined: 27 Sep 2018 Posts: 756 Location: USA
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Posted: Mon Jun 10, 2019 8:13 pm Post subject: |
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KEO wrote:
Thanks for the responses.
DConvert wrote: |
There are of course also T2 lenses which can have M42 adapters fitted. These adapters are usually adjustable for orientation. Is that the case for your Isco? |
No, it's definitely M42. It mounts perfectly except for finishing upside down.
visualopsins wrote: |
Search Google images for that lens. Look for one showing it mounted on a camera. Compare how yours looks... |
That's an excellent idea and I tried it, but there aren't many images of this lens to begin with, and the only images of it adapted seem to be Exakta mount...
visualopsins wrote: |
Ahem, there are here, elsewhere, and have been, many, who are able to take apart that lens completely and put it back together so well nobody could ever discern it has been worked upon, yes? |
No doubt, but I believe the mount and the body are a single piece of metal. There's nothing to disassemble. It's an incredibly simple mechanical design.
Nonetheless, I'm going to give it a close inspection again just to be absolutely sure. I've been too busy for the past few days. |
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Lightshow
Joined: 04 Nov 2011 Posts: 3669 Location: Calgary
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visualopsins
Joined: 05 Mar 2009 Posts: 10463 Location: California
Expire: 2021-06-22
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Posted: Tue Jun 11, 2019 12:01 am Post subject: |
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visualopsins wrote:
I'd guess the lens is pk-mount because many pk to canon adapters mount the lens upside down so protruding parts back of lens don't foul camera mirror.
However it does look like m42 lens adapter on the Canon, one with defective orientation. Then the m42 to pk adapter for the k-x mounts the lens correct orientation. _________________ ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ like attracts like! ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮
Cameras: Sony A7Rii, Spotmatics II, F, and ESII, Nikon P4
M42 Asahi Optical Co., Lenses:
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
Other lenses:
Carl Zeiss Jena Flektogon 2.4/35
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
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secludedsea
Joined: 01 Oct 2014 Posts: 82 Location: Adelaide, Australia
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Posted: Tue Jun 11, 2019 1:02 am Post subject: |
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secludedsea wrote:
Hey, just slightly OT. I have one of those Isconar 100mm 4.5 lenses but it came to me full of light fungus. How can I get this one apart easily for cleaning? I could resell it, but don't have any other 100s.
Steve
KEO wrote: |
Thanks for all the information, guys!
The (M42-FX) adapter I'm using in this case is a Fotasy with a macro helicoid. I use lots of other lenses with it with no problem.
The problem only seems to occur when I mount my Isco 100mm Isconar 4.5. It's a fantastic lens, but it has a number of oddities. The filter thread is an unusual 41mm (iirc) and the ergonomics are unusual too: a big aperture ring behind a very small focus ring near the front. It feels very backwards and requires some getting used to.
I don't think it's been reassembled incorrectly. It's such an incredibly simple triplet design I believe I'd be able to tell, as would anyone else. Old silver Isco lenses are probably the most mechanically simple designs I've seen. The body and the mount are one single piece of tube-shaped metal.
That's why I'm wondering if the upside-down mounting was made for a specific camera line. I will keep researching. |
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DConvert
Joined: 12 Jun 2010 Posts: 901 Location: Essex UK
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Posted: Tue Jun 11, 2019 9:05 am Post subject: |
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DConvert wrote:
KEO wrote: |
Thanks for the responses.
DConvert wrote: |
There are of course also T2 lenses which can have M42 adapters fitted. These adapters are usually adjustable for orientation. Is that the case for your Isco? |
No, it's definitely M42. It mounts perfectly except for finishing upside down.
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I meant a T2 lens with a M42 adapter already fitted - I've brought lenses like that assuming they were in the visible mount then found the T2 thread later allowing correction of orientation or simple change of mount. |
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KEO
Joined: 27 Sep 2018 Posts: 756 Location: USA
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Posted: Tue Jun 11, 2019 8:34 pm Post subject: |
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KEO wrote:
Lightshow wrote: |
https://spiral-m42.blogspot.com/2010/02/isco-gottingen-isconar-100mmf45.html
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The mount-end of mine looks exactly like the mount-end of the lens on this page.
You can see the screw mount is not separate from the body.
Taken apart and reassembled upside-down seems like the most likely cause. I can't discount it anyway.
It's hard to wrap my mind around how it could have happened though, especially considering the lens functions perfectly. It looks like it would require the aperture to be disassembled and removed, because taking off the front optical group wouldn't change the orientation of the aperture and focus scale.
secludedsea wrote: |
Hey, just slightly OT. I have one of those Isconar 100mm 4.5 lenses but it came to me full of light fungus. How can I get this one apart easily for cleaning? I could resell it, but don't have any other 100s. |
Mine had some fungus too. Luckily this is a pretty easy lens to clean since it only has three elements and its construction is so simple. If you open it up you'll be amazed how simple it is. I would -not- sell it without giving it a try; it's a real gem IMO.
The main thing to be extra-careful about is noting exactly how the focusing helicoid fits together so you can put it back the way it was. If you don't know how to do that you should make sure you at least read up on it before you begin.
There are three tiny screws around the focus ring that hold the front group in place. Make sure to note the position of the screws so you can put them back in the right place. If you remove them you can unscrew the front group, which will give you access to the first two elements, and access to the third element through the body as well. You can open up the front group if you need access to the inner faces of the first two elements.
When you're done cleaning all you have to do is make sure you mate the pats of the helicoid correctly, put the focus ring back on, and return the screws to the right place. There will be little dents in the brass where the sharp ends of the screws grab the front optical group, so you can use those as a guide. Hopefully you will have left marks with tape or something so you won't even need a guide.
DConvert wrote: |
I meant a T2 lens with a M42 adapter already fitted - I've brought lenses like that assuming they were in the visible mount then found the T2 thread later allowing correction of orientation or simple change of mount. |
I don't think that's the case, but I'm willing to explore any possibility. |
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visualopsins
Joined: 05 Mar 2009 Posts: 10463 Location: California
Expire: 2021-06-22
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Posted: Tue Jun 11, 2019 8:54 pm Post subject: |
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visualopsins wrote:
+1 for whomever wrote
Quote: |
The main thing to be extra-careful about is noting exactly how the focusing helicoid fits together so you can put it back the way it was. If you don't know how to do that you should make sure you at least read up on it before you begin.
There are three tiny screws around the focus ring that hold the front group in place. Make sure to note the position of the screws so you can put them back in the right place. If you remove them you can unscrew the front group, which will give you access to the first two elements, and access to the third element through the body as well. You can open up the front group if you need access to the inner faces of the first two elements.
When you're done cleaning all you have to do is make sure you mate the pats of the helicoid correctly, put the focus ring back on, and return the screws to the right place. There will be little dents in the brass where the sharp ends of the screws grab the front optical group, so you can use those as a guide. Hopefully you will have left marks with tape or something so you won't even need a guide.
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_________________ ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ like attracts like! ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮
Cameras: Sony A7Rii, Spotmatics II, F, and ESII, Nikon P4
M42 Asahi Optical Co., Lenses:
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
Other lenses:
Carl Zeiss Jena Flektogon 2.4/35
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
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