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Mounting 35mm format lenses on an Arriflex?


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#1 Patrick Cooper

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Posted 31 October 2006 - 02:35 AM

With an early Arriflex model like a 16S or SB, is it possible to get adapters that allow 35mm still photography lenses to be mounted on the camera? If so, would there be any collimnation issues to be addressed?
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#2 Mark Dunn

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Posted 31 October 2006 - 04:15 AM

You'd have to match the flange focal depth, which is generally quite a bit longer on cine cameras to allow for the spinning mirror. So even with a mechanical adapter, your lenses would be too far away from the film. They'd work as macro lenses, but they wouldn't focus normally on their own.
For example, the Arriflex FFD is 52mm. Canon EOS FFD is 44mm.

PS: Here's a FFD list; 35mm. camera FFD's are all shorter that 52mm. (Very handy. Must bookmark.)
http://www.a1.nl/pho...rink/mounts.htm
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#3 Patrick Cooper

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Posted 31 October 2006 - 05:56 AM

Thanks for the information. So an adapter wouldn't compensate for the difference in flange focal depth? I use m42 mount 35mm format lenses on my Krasnogorsk 3 and focus is generally fine but screw thread lenses can be a nuisance.
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#4 Mark Dunn

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Posted 31 October 2006 - 07:03 AM

An adapter can only lengthen the FFD, it can't shorten it. You'd need a correcting lens, presumably.
Pardon? M42 IS a screw thread. By design, the M42-mount K3 has the correct FFD for M42 lenses- 44mm. To use such a lens on an Arri S the lens would have to be inside the mount, and it still might foul the mirror.
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#5 Patrick Cooper

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Posted 31 October 2006 - 09:45 AM

"M42 IS a screw thread."

Exactly. And they can be a nusiance.
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#6 Patrick Cooper

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Posted 31 October 2006 - 08:48 PM

I know of some people who have mounted Nikkor 35mm format lenses on an Aaton. Do Aaton cameras have a different flange focal depth to Arris?
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#7 Bernie O'Doherty

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Posted 31 October 2006 - 09:22 PM

Yes, Aaton's flange focal depth is 40mm or 1.5748 inches.
Arri's FFD is 52mm or 2.0472 inches.
bernie
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#8 Mark Dunn

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Posted 01 November 2006 - 12:21 PM

I suspect that wasn't an accident. Nikkor FFD is 46.50mm. Bingo.
And yes, it's a matter of debate just how hard you screw in an M42 lens, so you could affect the focus. My optics is very rusty, but I assume it's less critical with 35mm. stills than 16mm.
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#9 Stephen Williams

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Posted 01 November 2006 - 02:36 PM

I suspect that wasn't an accident. Nikkor FFD is 46.50mm. Bingo.
And yes, it's a matter of debate just how hard you screw in an M42 lens, so you could affect the focus. My optics is very rusty, but I assume it's less critical with 35mm. stills than 16mm.


Hi,

With a 35mm stills camera you focus by eye from the ground glass so collimation is not a big issue.

Stephen
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