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Another Rokkor 58mm f/1.2 to Minolta AF conversion

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Basil View Drop Down
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Post Options Post Options   Quote Basil Quote  Post ReplyReply Direct Link To This Post Topic: Another Rokkor 58mm f/1.2 to Minolta AF conversion
    Posted: 26 July 2011 at 15:55
Mark,

If you are going to use the Vivitar for Macro work, you may just want to get a glassless MC to MA adapter. It will act as a short extension tube and allow even closer focus. That's how I use mine and it works great.
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Post Options Post Options   Quote mark Quote  Post ReplyReply Direct Link To This Post Posted: 26 July 2011 at 15:51
i have an a200 and am looking for a macro lens. i found a vivitar mc mount 70-210 macro for a good price. would this conversion work on that lens?

thanks!
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Post Options Post Options   Quote debuggerus Quote  Post ReplyReply Direct Link To This Post Posted: 05 October 2009 at 06:12
I did the conversion a while ago (last year). This is from my memory:

Remove the 3 screws and the move the back. Turn the back over and remove the mount thru the back. With the mount removed, I flattened the back and put an M42 mount (taken from a broken takumar 135mm). You can just put an M42-A mount or EOS adapter which should work fine. To adjust infinity focus, remove the focus rubber, then remove the tape that holds the focusing distance mark ring and adjust infinity focus. When infinity is tuned, put the tape back and then the rubber.
I once borrowed a tamron adaptall 500 f8 and thought that the minolta is sharper.
By the way, the rear filters (ND, red, orange, and yellow) are not required.

Edited by debuggerus - 05 October 2009 at 06:19
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Post Options Post Options   Quote Swiftyspix Quote  Post ReplyReply Direct Link To This Post Posted: 04 October 2009 at 16:24
Originally posted by debuggerus debuggerus wrote:

The 500/8 mirror is one of the easier ones to convert. The lens is designed to focus beyond infinity so reaching infinity shouldn't be a problem. I had mine converted to M42 mount.

Did you do the conversion yourself or observe how the installation was accomplished, i.e. are the screws internal? Are the rear filters a necessary optical component as in the G telephoto primes?
I can see being able to mount a M42 adapter however turning down the outside diameter to match the lens base, the Minolta AF mount's internal diameter places the flange beyond the lenses base diameter.
I have a Vivitar bellows adapter ( Minolta MF-M42 male) and tried this with a M42-AF adapter combination and it places the lens beyond infinity.

Edited by Swiftyspix - 04 October 2009 at 16:40
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Post Options Post Options   Quote Arkku Quote  Post ReplyReply Direct Link To This Post Posted: 04 October 2009 at 13:03
Also no aperture control to worry about on the mirror lens… =)

Edited by Arkku - 04 October 2009 at 13:04
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Post Options Post Options   Quote debuggerus Quote  Post ReplyReply Direct Link To This Post Posted: 04 October 2009 at 05:27
The 500/8 mirror is one of the easier ones to convert. The lens is designed to focus beyond infinity so reaching infinity shouldn't be a problem. I had mine converted to M42 mount.
 



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Post Options Post Options   Quote Josiel Quote  Post ReplyReply Direct Link To This Post Posted: 02 October 2009 at 07:28
Thanks!

Off-topic mode [OFF]

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Post Options Post Options   Quote Alex H Quote  Post ReplyReply Direct Link To This Post Posted: 02 October 2009 at 06:29
Thanks Richard for information. In that case it is IMHO better to use the AF version (either Minolta or Sony) or the Tamron. I do not remember how much would You pay for the Minolta 500/8 for the manual focus minolta mount (am not sure if I can correctly call it MC or MD), but Tamron mirror in nice condition sells now for 150-200 dollars on the evilBay in US.

I think we are going a bit off-topic here now.
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Post Options Post Options   Quote Swiftyspix Quote  Post ReplyReply Direct Link To This Post Posted: 02 October 2009 at 06:16
Alex, I have a 500/8 right in front of me and it does not look easy. The mount appears to part of the lens base and installed from the inside. This portion is tapered to a diameter smaller than an AF mount. There are no screws showing from the outside other than the focus ring screws. The filters also mount inside the lens mount.

Edited by Swiftyspix - 02 October 2009 at 06:18
α850 α77 α700 7D Max7 BBC BC 70-300G 80-200G 28-135 35-105 28-70G 24-50/4 11-18KM AF500/8M 135/2.8 100/2.8M Macro 85/1.4O MC58/1.2 50/3.5 Macro 35/1.4O 35/2 24/2.8 HVL 58AM
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Alex H View Drop Down
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Post Options Post Options   Quote Alex H Quote  Post ReplyReply Direct Link To This Post Posted: 02 October 2009 at 05:57
As for the 500mm mirror lenses I would better go with the Tamron Adaptall or Sony/Minolta AF versions.
Conversion of the 500mm MD mirror is probably easy, since there is no aperture mechanism involved. Reaching the infinity focusing might be more complicated...
Alex
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Post Options Post Options   Quote Alex H Quote  Post ReplyReply Direct Link To This Post Posted: 02 October 2009 at 05:54
Pete, I am not talking about 58mm, but about 50mm 1.4 MC Rokkor-X PG. I mistyped it as 1.5 and forgot to add "-X" so apologize if I confused anyone.

It is not as easy to convert as 58mm MC Rokkor, but might be easier than the later versions of 50mm MD. And according to "rokkorfiles" it might be just a bit better than the MD version, although I never compared them myself.

Alex
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Post Options Post Options   Quote Josiel Quote  Post ReplyReply Direct Link To This Post Posted: 02 October 2009 at 05:53
Hi!

Does anyone know if the 500mm MD Rokkor (mirror) can be adapted?

Thanks!
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Post Options Post Options   Quote Pete Ganzel Quote  Post ReplyReply Direct Link To This Post Posted: 02 October 2009 at 05:41
Originally posted by Alex H Alex H wrote:

Hello clsmith,

I did convert the Minolta MC Rokkor PG 50 1.5 into MAF mount but it was not easy. The aperture linkage has nothing to do with it - I did not have t modify anything. Just attaching the M42 adapter is also very simple task, but to be able to reach infinity I had to remove (with the help of Dremel) one or two millimeters of the metal base of the lens (where MC mount was attached to.

PM me if You want to know more details or see pictures.
Alex


Alex:

CL is asking about a 50mm MD f/1.4 which is different than the MC lenses. The 58mm MC Rokkors are relatively easy to adapt.

Pete
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Alex H View Drop Down
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Post Options Post Options   Quote Alex H Quote  Post ReplyReply Direct Link To This Post Posted: 02 October 2009 at 02:56
Hello clsmith,

I did convert the Minolta MC Rokkor PG 50 1.5 into MAF mount but it was not easy. The aperture linkage has nothing to do with it - I did not have t modify anything. Just attaching the M42 adapter is also very simple task, but to be able to reach infinity I had to remove (with the help of Dremel) one or two millimeters of the metal base of the lens (where MC mount was attached to.

PM me if You want to know more details or see pictures.
Alex
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