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Follow Focus matchup issues Arri SR2

Super 16mm Follow Focus Cooke 10.4-52 Arriflex SR2

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#1 Eric F Adams

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Posted 15 April 2017 - 09:45 PM

Okay, I'm confused and need advice.   My camera is the Arri SR2 (converted to Super).  My lens is the Cooke Varokinetal 10.4-52mm T2.  These lens were made for Super 16.  My camera came with a follow focus. See photos.  The camera tech informed me several years ago that my ff will not work with my lens.  Is that ff for a certain type lens?  Why doesn't it work for my lens?  I will be using that same camera and lens. I need a ff.  What ff can I get and it will work? 

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Edited by Eric F Adams, 15 April 2017 - 09:48 PM.

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#2 Stuart Brereton

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Posted 15 April 2017 - 09:54 PM

There's no reason for the follow focus to not work, unless the pitch of the gear wheel on it doesn't match the gear on the lens. If it doesn't, you need to buy a new gear, not a new follow focus.


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#3 Dom Jaeger

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Posted 15 April 2017 - 10:35 PM

Hard to tell from yr photos, does the ff clear the lens, reach the lens gear? What actually isn't working?

Is it just the gear pitch that doesn't match?
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#4 John Salim

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Posted 16 April 2017 - 05:21 AM

I just magnified the pictures, and it looks to me the pitch is different.

The Arii gear looks courser !

 

John S  :o


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#5 Tyler Purcell

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Posted 16 April 2017 - 05:06 PM

The question is, how does one source the right gear...
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#6 Gregg MacPherson

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Posted 16 April 2017 - 07:01 PM

Just pointing out that your lens gear is on your zoom ring.  You may well want a gear on your zoom sometime,  you can run a motor on it,  old J4s are cheap now.  I don't know how well you can zoom with that follow focus,  I never did it,  just used it for focus on primes.

 

Eventually,  if you are patient or clever,  you could have a decent 0.8 cine gear on focus and zoom rings.  The iris ring has only about 6mm available space before you start obscuring the T stop numbers,  so that's a bit trickier.  I pulled my 10.4-52 from the cupboard for a look,  the focus ring is a simple split gear with the clamp screw parallel to the ring tangent buried under the thread,  a limited run factory item.  These may still be around,  cheap if you can find them.

 

There are some interesting modern options...there was a chap,  selling on eBay,  helicopter sean,   making cheap gear rings that might be usefull,  can't remember if they were CNC made,  aluminum,  or some higher resolution 3D print 

 

(EDIT: factory item does not mean I imply it was made by cooke/arri.  My guess is a third party)


Edited by Gregg MacPherson, 16 April 2017 - 07:03 PM.

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