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09-08-2015, 09:35 AM   #1
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C-P/Q adapter - and an additional screw-in adaptor??

Just before heading out the door for my late summer vacation (at the airport now!), the postman delivered a low cost 25mm fine lens I ordered, which came with a C-P/Q adaptor (lens seems like fun, very sharp in the centre but pretty poor out towards the edges - portraits, here I come ). Also with the adaptor came a second adaptor which screws into the C-mount and presents a wider thread. Can anyone tell me what this is for? Assuming it's for another type of lens, is infinity focus likely to be affected?

09-08-2015, 09:52 AM   #2
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Measurements or photos please!
09-08-2015, 10:58 AM   #3
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QuoteOriginally posted by Professor Batty Quote
Measurements or photos please!
Ditto.
09-08-2015, 02:17 PM   #4
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If you mean wider in diameter, perhaps a T mount or m42? Or do you mean wider thread pitch?

09-09-2015, 05:12 PM   #5
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Is this just a little larger than C-mount? Diameter over threads maybe ~29mm vs ~25mm? If so, it could be a Bell & Howell Tri-Lens mount, which provided three lenses for 16mm cine in a rotating turret. The longer flange distance allowed for the turret, and makes an adapter for C-mount feasible, while providing infinity focussing.
09-09-2015, 10:53 PM   #6
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Thanks for the responses. I'm on holiday at the moment so don't have access to the adapter, but further online reading suggests the additional piece might be a macro adapto- ie. same diameter thread but bringing the lens forward like an extension tube.
09-10-2015, 07:11 AM   #7
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That's probably a CS adapter:

http://www.ikegami.com/cb/products/pdf/tech/lensmount.pdf
09-10-2015, 07:13 PM   #8
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Nope, CS has a shorter registration than C, so you can go from a CS to a C, but not the other way around.

QuoteOriginally posted by Professor Batty Quote


09-10-2015, 08:43 PM   #9
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"…a low cost 25mm fine lens I ordered…" It may well be a cs lens with an adapter.

We need some info.
09-10-2015, 11:07 PM   #10
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No, it's a c mount Fujian lens with a C-P/Q adapter, for sure. The lens fits that adapter and focuses to infinity, so that's all good. It's only this addition screw in ring that puzzled me, but as I say, researching online suggests it may be a macro extension ring. I'll check it when I'm back from my trip.
09-11-2015, 05:07 PM   #11
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A 'macro extension ring' could just as easily be an additional mount adapter to accommodate 'normal' focus for a second lens with a longer RD and with a compatible diameter thread. I've used step-up/down rings that way with so-so results.
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