Nikon F-adapter for Kyowa Model RFB-7

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Tailgunner
Posts: 4
Joined: Tue Jan 14, 2020 1:03 pm

Nikon F-adapter for Kyowa Model RFB-7

#1 Post by Tailgunner » Tue Jan 14, 2020 1:30 pm

I recently bought a Kyowa Medilux-12 trinoculaire.
It came with a camera-adapter Model RFB-7 also by Kyowa.
https://www.graysonline.com/lot/0237-50 ... hment-mino
I just have the camera adapter (I don't have the camera)

As far as I can tell there is a Minolta MD adapter that connects the RFB--7 to a minolta camera.
Image

However I only have Nikon D300 camera's.
So my question is if somebody can help me find an F-mount adapter that fits this RFB-7 so I can mount my Nikon camera to it.
The closest thing I could find was:
https://www.amazon.com/Fotodiox-Adapter ... =8-1-fkmr1
In this case I would have to adapters on top of each other. Probably not very elegant but I assume this could work.
Any thoughts ont his?

MichaelG.
Posts: 1580
Joined: Mon Apr 10, 2017 8:24 am
Location: NorthWest England

Re: Nikon F-adapter for Kyowa Model RFB-7

#2 Post by MichaelG. » Tue Jan 14, 2020 9:56 pm

Tailgunner wrote:
Tue Jan 14, 2020 1:30 pm
I recently bought a Kyowa Medilux-12 trinoculaire.
It came with a camera-adapter Model RFB-7 also by Kyowa.
https://www.graysonline.com/lot/0237-50 ... hment-mino
I just have the camera adapter (I don't have the camera)
That’s an interesting looking device
... Can you post some more photos, please ?

It’s just possible that the Minolta fitting is on a T mount thread

MichaelG.
Too many 'projects'

Tailgunner
Posts: 4
Joined: Tue Jan 14, 2020 1:03 pm

Re: Nikon F-adapter for Kyowa Model RFB-7

#3 Post by Tailgunner » Wed Jan 15, 2020 11:03 am

I took some photo's from the adapter:

https://drive.google.com/drive/folders/ ... sp=sharing

Now, the adapter itself for the camera has no thread. There are three setscrews that fasten the camera-adapter.
The part of the housing where the adapter is connected to has a V-shape, so that the set screws hook behind it.
The outer diameter of this part is the housing is +- 50 mm. (inside diameter of adapter is 49mm).
I was also able to unscrew the silver ring. This has a thread on it. The outside diameter of the thread on this part of the housing is 56 mm.

MichaelG.
Posts: 1580
Joined: Mon Apr 10, 2017 8:24 am
Location: NorthWest England

Re: Nikon F-adapter for Kyowa Model RFB-7

#4 Post by MichaelG. » Wed Jan 15, 2020 11:24 am

Thanks ...
I will have a look a the photos, and do some thinking [!], this evening.

MichaelG.
Too many 'projects'

MichaelG.
Posts: 1580
Joined: Mon Apr 10, 2017 8:24 am
Location: NorthWest England

Re: Nikon F-adapter for Kyowa Model RFB-7

#5 Post by MichaelG. » Wed Jan 15, 2020 11:32 am

Tailgunner wrote:
Wed Jan 15, 2020 11:03 am
[…]
The part of the housing where the adapter is connected to has a V-shape, so that the set screws hook behind it.
I couldn’t wait ...

That looks very much like one half of a T-mount

... more this evening

MichaelG.
Too many 'projects'

Hobbyst46
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Joined: Mon Aug 21, 2017 9:02 pm

Re: Nikon F-adapter for Kyowa Model RFB-7

#6 Post by Hobbyst46 » Wed Jan 15, 2020 11:36 am

FWIW, the inner filter thread on Minolta (film cameras) MD lenses is 49mm.
Zeiss Standard GFL+Canon EOS-M10, Olympus VMZ stereo

Tailgunner
Posts: 4
Joined: Tue Jan 14, 2020 1:03 pm

Re: Nikon F-adapter for Kyowa Model RFB-7

#7 Post by Tailgunner » Wed Jan 15, 2020 11:49 am

I took another measurement of the thread on the housing and it is a male thread 55.7 mm x 0.75 mm pitch.

Tailgunner
Posts: 4
Joined: Tue Jan 14, 2020 1:03 pm

Re: Nikon F-adapter for Kyowa Model RFB-7

#8 Post by Tailgunner » Wed Jan 15, 2020 12:53 pm

Wouldn't this work?;
https://www.ebay.co.uk/itm/T2-AI-Adapte ... 2749.l2649
If I were to remove the inner ring that is fastened with those Allen bolts I think I could mount it to the 50 mm diameter V-shaped part of the housing.

MichaelG.
Posts: 1580
Joined: Mon Apr 10, 2017 8:24 am
Location: NorthWest England

Re: Nikon F-adapter for Kyowa Model RFB-7

#9 Post by MichaelG. » Wed Jan 15, 2020 4:05 pm

... That [which is basically what I was intending to discuss] would almost certainly work.

MichaelG.
Too many 'projects'

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