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9mm Cooke on GSMO


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#1 don lee

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Posted 02 February 2007 - 02:04 PM

Looking for some help in using a Cooke 9m Arri mount (older style without the ridges running down the sides) on a Cinema Products GSMO. It fits the adapptor I have, which is a CP to Arri (with the grooves running down the inside) but is not in focus. It seems like I need an adaptor that is more shallow to bring the lens closer to the film plane but am not sure what that would be. By the way, I love my GSMO and have run a lot of nice film through it. Thanks
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#2 Ian Marks

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Posted 03 February 2007 - 12:51 PM

Sounds like you're fitting a lens with an Arri standard mount into an adapter intended for Arri bayonet lenses. Generally, this should be okay, but you might want to obtain a lower-cost Arri-standard to CP adapter and mount it, more or less permanently, to your Cooke using the little set screws. That way you'll still have the bayonet adapter available.

I have a Cooke Kinetal 12.5mm and have mounted it to my CP in this way. Is it possible that you put the lens into the wrong side of the adapter? If your focus is just slightly off, then you probably need to have your lens collimated. I assume it's seated fully into the adapter.
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#3 don lee

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Posted 03 February 2007 - 02:44 PM

thanks for that I tried locking down the adaptor and that didnt help so it must need collimation. By the way, I bought this lens for Cine Vision NY, someone was askng about them, and i gotta say they werent much help when i went back at them for answers.



Sounds like you're fitting a lens with an Arri standard mount into an adapter intended for Arri bayonet lenses. Generally, this should be okay, but you might want to obtain a lower-cost Arri-standard to CP adapter and mount it, more or less permanently, to your Cooke using the little set screws. That way you'll still have the bayonet adapter available.

I have a Cooke Kinetal 12.5mm and have mounted it to my CP in this way. Is it possible that you put the lens into the wrong side of the adapter? If your focus is just slightly off, then you probably need to have your lens collimated. I assume it's seated fully into the adapter.


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#4 Bernie O'Doherty

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Posted 03 February 2007 - 05:01 PM

Could be one two things.
The adaptor have the incorrect mechanical distance from the film plane.
The lens may need collimation or/and calibration.
Doesn't sound like a big problem, and it shouldn't take much time to do.
Might also be your GSMO, but you already said it's fine.
Cheers, Bernie
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#5 david west

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Posted 05 February 2007 - 06:46 PM

does anyone know the Flange focal distance for CP lenses?
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#6 Ian Marks

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Posted 05 February 2007 - 09:43 PM

I believe it's in Doug Underdahl's 16mm Help Book - unfortunately I'm far from my copy and can't check it - but something tells me it's 2 inches.

Yup, I said inches. It's an Ah-murrican camera, after all.

I'll see if I can check it and post tomorrow.
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#7 Bernie O'Doherty

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Posted 06 February 2007 - 10:34 AM

1.5 inches or 38.1mm = CP-16 flange focal depth.
Same (of course) for GSMO
Cheers, Bernie
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#8 david west

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Posted 06 February 2007 - 04:46 PM

thanks for the responses...

now off to the lathe....
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