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Phalbert
Joined: 17 May 2009
Posts: 377
Location: Namibia
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 Posted: Sat Feb 03, 2024 10:27 am Post subject: Help with look alike T-mount but apparently no. |
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Phalbert wrote:
Hi folks. I have this "Lentar" (Tokina?) 21/3,8 with an - apparently - fixed Canon FD mount.
It looks a lot like a T-mount but there are no visible screws on the outer side of the ring.
There are however 4 screws inside the mount itself. I tried to unscrew that ring just by grabing and turning as you can do it with T-mount but it doesn't move.
Any idea as to being able to change that mount?
Sorry for my usual ugly cellphone pics. The dot on the ring is not a screw. It's the mounting position dot.
Thanks a lot.
  
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My dream lenses: Zuiko 180/2 Prototype Zuiko 85/1,4
Zeiss CY: 55/1,2 85/1,2
Astro Berlin 250/2 Canon EF 50/1,0 85/1,2
Nikkor 105/1,4 28/1,4
My stolen stuff: Zuiko 24/2 #106874; Zuiko 35-80/2,8 #102180; Zuiko 35/2 #119168; Zuiko 90/2 macro #102858; Zuiko x1,4 converter #102019; Tamron 17/3,5 #400567; Tamron 400/4 #80407; Soligor 135/2 #17506600 Sigma 28/1,8 #1001124 |
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RokkorDoctor
Joined: 27 Nov 2021
Posts: 1405
Location: Kent, UK
Expire: 2025-05-01
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| Posted: Sat Feb 03, 2024 1:56 pm Post subject: |
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RokkorDoctor wrote:
Canon FD experts may be able to tell you more, but isn't that a Canon FD breech lock mount?
My best guess would be that you need to remove the chrome slotted screw visible on the back of the lens in your third image; that probably prevents the breech lock nut/ring from being able to turn off completely. Once the breech lock nut unscrews completely my guess would be that mount screws become visible/accessible.
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SONY A7S, A7RII + dust-sealed modded Novoflex/Fotodiox/Rayqual MD-NEX adapters
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marcusBMG
Joined: 07 Dec 2012
Posts: 1312
Location: Conwy N Wales
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| Posted: Sat Feb 03, 2024 2:08 pm Post subject: |
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marcusBMG wrote:
Doesn't look like a t-mount to me - t-mounts never have aperture connections. The fd t-mount is just a bayonet locking mechanism. Might it be a sigma ys like swappable mount - it its swappable?
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Pentax K3-ii; pentax K-S2; Samsung NX 20; Lumix G1 + adapters;
Adaptall collection (proliferating!) inc 200-500mm 31A, 300mm f2.8, 400mm f4.
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heritagecameras
Joined: 19 Feb 2011
Posts: 104
Location: UK
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| Posted: Sun Feb 04, 2024 12:09 am Post subject: Re: Help with look alike T-mount but apparently no. |
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heritagecameras wrote:
| Phalbert wrote: |
Hi folks. I have this "Lentar" (Tokina?) 21/3,8 with an - apparently - fixed Canon FD mount.
It looks a lot like a T-mount but there are no visible screws on the outer side of the ring.
There are however 4 screws inside the mount itself. I tried to unscrew that ring just by grabing and turning as you can do it with T-mount but it doesn't move.
Any idea as to being able to change that mount?
Sorry for my usual ugly cellphone pics. The dot on the ring is not a screw. It's the mounting position dot.
Thanks a lot.
|
That's a fixed-mount lens in Canon FL fitting, so I wouldn't go unscrewing anything...
The ring at the rear is turned to attach it to the camera – known as a "breech lock" fitting.
Many Canon FL-fit lenses will fit FD adapters for mirrorless cameras.
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visualopsins
Joined: 05 Mar 2009
Posts: 10958
Location: California
Expire: 2025-04-11
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| Posted: Sun Feb 04, 2024 1:46 am Post subject: |
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visualopsins wrote:
the m-ft scale on yours is larger diameter than aperture scale unlike the Vivitar (Tokina) https://youtu.be/XyjUQ6ovPS4
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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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philslizzy
Joined: 07 Aug 2012
Posts: 4744
Location: Cheshire, England
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| Posted: Sun Feb 04, 2024 4:26 pm Post subject: |
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philslizzy wrote:
It's a fixed mount lens. The ring is to attach the lens to a Canon
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BrianSVP
Joined: 09 Jun 2023
Posts: 335
Location: Philadelphia
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| Posted: Sun Feb 04, 2024 4:55 pm Post subject: |
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BrianSVP wrote:
Kinda. The Sigma YS mount is actually geometrically identical to a T2 mount but does have an aperture pin. In fact, you can use a regular T2 adapter on a YS lens just fine!
Another interesting fact is that some supposedly dedicated mount Sigma "XQ" lenses still have a YS mount hidden inside them if you remove enough of the decorative exterior rings. The 16mm Filtermatic Fisheye is one such lens.
As far as the lens that's the subject of this thread goes, it looks like it's the earlier FL mount wihtout the indexing lever and A pin that the FD mount lenses have.
| marcusBMG wrote: |
Doesn't look like a t-mount to me - t-mounts never have aperture connections. The fd t-mount is just a bayonet locking mechanism. Might it be a sigma ys like swappable mount - it its swappable?
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vivaldibow
Joined: 23 Jun 2018
Posts: 841
Expire: 2021-03-09
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| Posted: Wed Feb 07, 2024 7:02 am Post subject: Re: Help with look alike T-mount but apparently no. |
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vivaldibow wrote:
| Phalbert wrote: |
Hi folks. I have this "Lentar" (Tokina?) 21/3,8 with an - apparently - fixed Canon FD mount.
It looks a lot like a T-mount but there are no visible screws on the outer side of the ring.
There are however 4 screws inside the mount itself. I tried to unscrew that ring just by grabing and turning as you can do it with T-mount but it doesn't move.
Any idea as to being able to change that mount?
Sorry for my usual ugly cellphone pics. The dot on the ring is not a screw. It's the mounting position dot.
Thanks a lot.
|
Canon FL. I guess it is a fixed mount. Vivitar T4 21mm 3.8. Should be the same. But interchangeable. |
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visualopsins
Joined: 05 Mar 2009
Posts: 10958
Location: California
Expire: 2025-04-11
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| Posted: Wed Feb 07, 2024 7:31 am Post subject: Re: Help with look alike T-mount but apparently no. |
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visualopsins wrote:
| vivaldibow wrote: |
| Phalbert wrote: |
Hi folks. I have this "Lentar" (Tokina?) 21/3,8 with an - apparently - fixed Canon FD mount.
It looks a lot like a T-mount but there are no visible screws on the outer side of the ring.
There are however 4 screws inside the mount itself. I tried to unscrew that ring just by grabing and turning as you can do it with T-mount but it doesn't move.
Any idea as to being able to change that mount?
Sorry for my usual ugly cellphone pics. The dot on the ring is not a screw. It's the mounting position dot.
Thanks a lot.
|
Canon FL. I guess it is a fixed mount. Vivitar T4 21mm 3.8. Should be the same. But interchangeable. |
https://youtu.be/XyjUQ6ovPS4 shows the not-same Vivitar 
_________________
☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ 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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vivaldibow
Joined: 23 Jun 2018
Posts: 841
Expire: 2021-03-09
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| Posted: Thu Feb 08, 2024 4:32 am Post subject: Re: Help with look alike T-mount but apparently no. |
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vivaldibow wrote:
| visualopsins wrote: |
| vivaldibow wrote: |
| Phalbert wrote: |
Hi folks. I have this "Lentar" (Tokina?) 21/3,8 with an - apparently - fixed Canon FD mount.
It looks a lot like a T-mount but there are no visible screws on the outer side of the ring.
There are however 4 screws inside the mount itself. I tried to unscrew that ring just by grabing and turning as you can do it with T-mount but it doesn't move.
Any idea as to being able to change that mount?
Sorry for my usual ugly cellphone pics. The dot on the ring is not a screw. It's the mounting position dot.
Thanks a lot.
|
Canon FL. I guess it is a fixed mount. Vivitar T4 21mm 3.8. Should be the same. But interchangeable. |
https://youtu.be/XyjUQ6ovPS4 shows the not-same Vivitar |
Optically should be the same, literally just Tokina. |
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Phalbert
Joined: 17 May 2009
Posts: 377
Location: Namibia
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| Posted: Thu Feb 08, 2024 7:01 am Post subject: |
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Phalbert wrote:
Thanks everybody. The video is nice. I wish it was a T4, but it's not.
I'm not thinking of starting yet another system, like 4/3 or mirrorless. Too much other stuff. So Canon FD, Minolta MD and Konicas are out for now.
_________________
🙋 My wishlist: Titan or Idaho 135/1,8 Nikon Df Nikkor 105/1,8 35/1,4 85/1,4
My dream lenses: Zuiko 180/2 Prototype Zuiko 85/1,4
Zeiss CY: 55/1,2 85/1,2
Astro Berlin 250/2 Canon EF 50/1,0 85/1,2
Nikkor 105/1,4 28/1,4
My stolen stuff: Zuiko 24/2 #106874; Zuiko 35-80/2,8 #102180; Zuiko 35/2 #119168; Zuiko 90/2 macro #102858; Zuiko x1,4 converter #102019; Tamron 17/3,5 #400567; Tamron 400/4 #80407; Soligor 135/2 #17506600 Sigma 28/1,8 #1001124 |
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