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CA-1 to PL adapter?


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#1 Robert Szanto

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Posted 11 January 2011 - 01:10 PM

Has anyone had any experiences with the CA-1 to PL mount adapters that are floating around ebay? I've heard from other places that an adapter like this wouldn't allow for infinity focusing. Any other ways of getting a CA-1 lens on a PL mount camera?
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#2 Jean-Louis Seguin

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Posted 11 January 2011 - 01:36 PM

Quite right. The inexpensive adapters sold by an eBayer in The Netherlands do not allow infinity focus.
It may be possible to have a custom PL-mount made for your lens but again it will depend whether the physical dimensions of lens will allow such a modification.

Cheers,
Jean-Louis
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#3 John Sprung

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Posted 11 January 2011 - 02:15 PM

To say for sure, we'd have to know the flange-focal distance for the CA-1. I tried Google and Wikipedia, and came up empty.

CA-1 was never a good lens mount, it was tempermental and loose. So, if you have any CA-1 lenses, you have to decide whether to get them re-mounted, or preserve them as antiques.





-- J.S.
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#4 Mitch Gross

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Posted 11 January 2011 - 02:53 PM

We can supply a proper adapter from CA-1 to PL.

The CA-1 was pretty close to the ARRI standard, so making a proper adpapter to PL is not impossible, you just have to know what you're doing.

Feel free to contact me offlist.
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#5 Leo Anthony Vale

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Posted 11 January 2011 - 04:40 PM

To say for sure, we'd have to know the flange-focal distance for the CA-1. I tried Google and Wikipedia, and came up empty.


The CA-1 flange-focal distance is 48mm. Don't recall the mount diameter, but it is wider than the Arri std. & bay.

The PL and other Arri flane-focal distance is 52mm.
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#6 Dima Turaev

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Posted 03 March 2011 - 08:38 AM

Hi! And what is the СA-1, put photos. And in Russia in general can be any lenses in the PL mount to change, if interested write to the PM.
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#7 Leo Anthony Vale

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Posted 03 March 2011 - 06:37 PM

Hi! And what is the СA-1, put photos. And in Russia in general can be any lenses in the PL mount to change, if interested write to the PM.


The PM? Do you mean Vladimir Putin?
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#8 Ian Cooper

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Posted 04 March 2011 - 05:30 AM

PL Mount is 54mm diameter with a FFD of 52mm
CA-1 Mount is 46mm diameter with a FFD of 48mm.


As already stated, an adapter to fit a PL mount lens on a CA-1 mount camera is not feasible - the lens is already too large to fit in the camera before you've put it in an adapter.

An adapter to fit a CA-1 mount lens on a PL mount camera might be feasible depending on the lens in quesion. The smaller diameter of the lens means there would be a 4mm wall thickness on the adapter, this just leaves the different FFD. To work perfectly the CA-1 lens seating surface needs to be recessed 4mm behind the PL mount seating surface ie. back inside the camera.

In most real world situations I suspect there won't be enough room to actually accomodate the back end of the CA-1 lens body within the available space. However, if you had a small enough diameter lens then it might be possible to get a custom adapter made. Really the lens body would need to be no larger than the CA-1 mount itself. Some of the bolex c-mount lenses seem fairly small diameter, so perhaps if you'd come across one of those which had been modified to CA-1 mount you might be able to get away with it, but I guess the chances of all that are pretty slim! :lol:
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#9 Dima Turaev

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Posted 20 March 2011 - 02:16 PM

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