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Minolta Kyocera?Yashica AF mount lens

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Cliff View Drop Down
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Post Options Post Options   Quote Cliff Quote  Post ReplyReply Direct Link To This Post Topic: Minolta Kyocera?Yashica AF mount lens
    Posted: 10 July 2007 at 20:40
Anyone know anything about a Kyocera/Yashica AF mount? It looks like a Minolta AF mount, but the parts are in slightly different locations?

Is it a Minolta mount in drag?

Thanks,

Cliff
 



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Sanjuro View Drop Down
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Post Options Post Options   Quote Sanjuro Quote  Post ReplyReply Direct Link To This Post Posted: 10 July 2007 at 21:18
Cliff do you mean an adaptor from Minolta AF to yashica?
Rgds
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rogprov View Drop Down
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Post Options Post Options   Quote rogprov Quote  Post ReplyReply Direct Link To This Post Posted: 10 July 2007 at 22:16
There were only ever abut 5 lenses in this mount which fitted only the 230, 270 and 300AF bodies. There was also an adapter fitting the AF bodies and accepting C/Y manual focus lenses and rather cleverly auto-focussing them. The mount is very similar to the Minolta mount and comparing the two close up it does look as if with a bit of engineering a fit may be possible. However I don't think it would be worth the effort.

Roger

Edited by rogprov - 10 July 2007 at 22:17
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Post Options Post Options   Quote Cliff Quote  Post ReplyReply Direct Link To This Post Posted: 11 July 2007 at 03:31
Thanks, I had no clue. I picked this one up by mistake. It's a nice little push pull Sigma 70-210mm. I looked at the contacts and the bayonet and figured it was a Minolta AF mount. Imagine my surprise when it almost but not quite mounted.

The focus drive is in the right spot. The contacts are aligned slightly counterclockwise from Minolta, but the killer is that the diaphram lever is opposite the contacts instead of adjacent to them. That's mostly what kept it from mounting, and that would be hard to change.

I'll try to find a home for it. Someone out there must still be shooting them. Now if there was just a Minolta/Sony AF adapter for old manual Minolta mounts like you described for the C/Y that would just fill the bill. It sure would be nice to give that old glass a new lease on life.




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Pete Ganzel View Drop Down
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Post Options Post Options   Quote Pete Ganzel Quote  Post ReplyReply Direct Link To This Post Posted: 11 July 2007 at 04:13
Hi Cliff:

Like Roger said, the Yashica system came out several years after the Minolta AF system and is uncannily similar. There either must have been some collaboration with Minolta or has to be the most brazen case of copying ever with any camera.

The ROM contacts are identical as well as the aperture linkage and AF drive..just placed differently enough not to be interchangeable. I have swapped ROMS and they do not work.




The cameras are nicely made and well implemented. This one has an AF assist light built into the camera.

The distance scale of the lenses are oddly placed at about 10 o'clock toward the shutter release instead of the top.



There was a small collection of lenses made, these all by Kyocera and later by Sigma. They even duplicated the nutty power zoom lenses that Minolta made.



I imagine there are user/collectors out there that could use your Sigma but this is the best example of an orphaned system I can think of :7).

Pete






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Cliff View Drop Down
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Post Options Post Options   Quote Cliff Quote  Post ReplyReply Direct Link To This Post Posted: 11 July 2007 at 05:37
Hi Pete,

Thanks so much to you and Roger for helping me understand what I had. Glad I tickled your fancy. Your side by side shot of the mounts is what I had to do to figure out I wasn't looking at a Minolta AF mount. They really are remarkably similar.

"nutty power zooms" - engineers have to be careful we're solving real problems:)

I admired your elegant Rokkor mount, and have been tickled by your other excursions and adaptations. Life should be fun, and technology both accessible and flexible. Looks like you're having a good time. Sounds like the Yashica adapter was a good hack. Does it provide a leg up for a Minolta AF adapter for MF mount lenses?

If you're one of the collectors of the Yashicas, I'd be pleased to contribute a lens. Orphans deserve an appreciative home, especially if they're nicely made:).

Regards,

Cliff
 



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Post Options Post Options   Quote Pete Ganzel Quote  Post ReplyReply Direct Link To This Post Posted: 11 July 2007 at 06:38
Thanks for the offer Cliff, but I have one of the Sigmas already,
..got a whole box with the camera and 8 lenses. I'll probably just keep the camera and maybe the power zoom and the 50mm for my collection after I look them over a little better to see how they're put together.

Took those photos back in April and forgot about them until your post.

Anyway, that Kyocera adapter that makes manual focus ContaxYashica lenses AF is a rare bird, seems the last one I saw on e-bay went for something like $250 and I stole these photos;





The focusing element is a high quality achromat that acts as a weak teleconverter.

Sigma also made something similar for the Maxxum and that is even rarer.

Wouldn't it be a coup if Sony came out with a T mount on the lens side that would make any manual focus lens an AF lens?

Pete








Edited by Pete Ganzel - 12 July 2007 at 08:39
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rogprov View Drop Down
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Post Options Post Options   Quote rogprov Quote  Post ReplyReply Direct Link To This Post Posted: 11 July 2007 at 08:13
There's a 1.6 auto/manual converter on eBay 130069342274 right now - BIN 79 GBP
Roger
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Post Options Post Options   Quote Pete Ganzel Quote  Post ReplyReply Direct Link To This Post Posted: 11 July 2007 at 08:37
He He Roger,   from the same seller, the Sigma Maxxum converter; 130126197498 for 59 GBP.
Didn't even know these existed with the Nikon lens mount.

Hmmm... if you could just reconfigure the ROM..



Pete

Edited by Pete Ganzel - 11 July 2007 at 08:37
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Swiftyspix View Drop Down
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Post Options Post Options   Quote Swiftyspix Quote  Post ReplyReply Direct Link To This Post Posted: 11 July 2007 at 17:59
Originally posted by Pete Ganzel Pete Ganzel wrote:



The focusing element is a high quality achromat that acts as a weak teleconverter.

Sigma also made something similar for the Maxxum and that is even rarer.

Pete

Wouldn't it be a coup if Sony came out with something with a T mount or something similar on the lens side that would make any manual focus lens an AF lens.



Hello,
   Am I missing something here about your reference to MF-AF functions regarding these adapters. My understanding is these adapters allow the MF lens to be mounted on an AF body and only transmit the aperture setting to the camera, focusing and setting the aperture is still manual. Do they mechanically adjust the aperture setting according to the cameras' setting?
Thanks, Swifty








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Post Options Post Options   Quote PhotoTraveler Quote  Post ReplyReply Direct Link To This Post Posted: 12 July 2007 at 05:15
So did that system have anything of interest, like TS lenses or such that would make trying to hack one on worth while?
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Post Options Post Options   Quote Pete Ganzel Quote  Post ReplyReply Direct Link To This Post Posted: 12 July 2007 at 08:18
Hi Swiftyspix:

Am I missing something here about your reference to MF-AF functions regarding these adapters. My understanding is these adapters allow the MF lens to be mounted on an AF body and only transmit the aperture setting to the camera, focusing and setting the aperture is still manual. Do they mechanically adjust the aperture setting according to the cameras' setting?


Both adapters shown provide autofocus functions by using the cameras focus motor to move an element in the adapter. This is the main curiosity.

In addition, the Kyocera adapter provided auto aperture function with Contax/Yashica Manual Focus lenses on the Yashica AF Cameras. The aperture ring on the lens functioned normally and even apparently, was meter coupled.
The arrangement of the aperture actuator on the Yashica cameras may have been specifically designed to work with the lever in the old Contax lenses to allow using this adapter.

Looks like the Sigma adapter for the Minolta AF system gives indication of maximum f/stop only. There appears to be no control of the lens aperture, which is used in stop down mode.   I'll post the construction and capabilites of this adapter when I receive it :7).

Pete     
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Post Options Post Options   Quote Pete Ganzel Quote  Post ReplyReply Direct Link To This Post Posted: 12 July 2007 at 08:26
Hi PhotoTraveler:

So did that system have anything of interest, like TS lenses or such that would make trying to hack one on worth while?


They are not that common. Most are uninspired copycats of the cheapo consumer Maxxum lenses. There is an interesting 1:1 60mm Macro, but that is quite rare and probably not good "hack fodder". There are so many little differences even though they look similar, that as Roger said earlier, probably make it not worth the trouble.

Pete
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Post Options Post Options   Quote PhotoTraveler Quote  Post ReplyReply Direct Link To This Post Posted: 12 July 2007 at 09:14
This is all very interesting to me. I was never aware of this mount before. I knew of the manual focus mount, and the later Contax N mount. But never of this.

So a few other questions. I did some looking and what I could find said to the effect of "the pulled heavily from the maxxum". And since it came out in 86, it sounds like it very well was the second brand with real AF.

So, is the registration distance the same. and do the lens actually mate or can they with a bit of filing. From your photo it looks like some slight differences. I'm curious because it would be interesting if they at least bolt on and are optical right.

I agree and was my first thought, they moved the aperture lever to make the adapter work right. But it makes me curious. If you had that adapter and got it on an A mount camera could you then adapt a MD lens to it and modify the aperture lever to the MD lens and get it to work right. If I remember right the MD mount does aperture based on fixed points of rotation, where the A mount does something different. If this does the correct adaption. Maybe with a bit of work you could automate a MD lens onto this. You probably don't need the rom to work. You just want to get the body to fire the kick down and have the magic in this thing convert it all to positional aperture control.

Of course if this was a possibility I'm sure Pete you would have done it all ready or tried.
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