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11-09-2012, 01:50 PM   #16
drougge's Avatar

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QuoteOriginally posted by wombat2go Quote
If I were doing an adaptor I would first make a diagram like the one I did with assistance from MysteryOnion for adapting Pentax 110 to M43:
It would be necessary to check that the CS register of 12.526 mm can be met with sufficient annular metal in the adaptor.

I see that the CS thread is 1 inch by 32 tpi so it would need to be cut on a USA or old British lathe, or a Metric lathe that has leadscrew gears that can do a pitch of 1/32 inch which is 0.7937 mm. If the CS mount was invented in USA it will have thread angle of 60 degree, if British, probably 55 degree.

The way I do the bayonet mounts is to take a body cap into my (dirty) workshop and measure it as accurately as possible and replicate on the lathe,
leaving enough metal to finely adjust by trial fitting the new adaptor into the camera body.

I think a very high accuracy ( maybe 0.02 mm ) on the register will be needed, especially if a variable focal length (zoom) lens is used.
I feel a bout of lazyness coming on just reading about it. Maybe the Chinese will start making adapters soon. (I expect I will at least take the problem (and this information) to some hackerspace and see if someone feels like helping with it. Once my adapters arrive that is.)

QuoteOriginally posted by Erich_H Quote
You can do that with a big lens like that. All (4-5) CS-lenses I've seen live has been really small and cheaply built as opposed to your lens. Did you buy your lenses in Sweden?
I would probably try to prop the lens up. The Chinese lens is from ebay, the zoom I bought locally.

11-10-2012, 08:57 AM   #17
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QuoteOriginally posted by drougge Quote
(I expect I will at least take the problem (and this information) to some hackerspace and see if someone feels like helping with it. Once my adapters arrive that is.)
I just ordered a cheap CS lens (6-60mm f/1.4-1.6... how's that for variable aperture!?) and a one-piece D-mount adapter to hack up. A friend has a metal shop, so I'll give "adapting the adapter" a go... of course, I'm still waiting for my Q-mount camera to arrive!!

Last edited by panoguy; 11-10-2012 at 09:08 AM.

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