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Flange Focal distance Adjustment


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#1 Stephen Williams

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Posted 01 October 2006 - 05:09 AM

Hi All,

Can anybody explain how to measure the FFD on a RED camera? I assume that using a depth gauge is a bad idear.

Note 35mm PL lenses focus at a FFD of 52.00mm, unlike video lenses, do not have a back focus adjustment. With a film camera a steel block is put in the gate, as a base to measure from. Arri cameras are usually set to 51.98 so that perfect focus is into the film.


Stephen
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#2 Olex Kalynychenko

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Posted 01 October 2006 - 12:21 PM

Hi All,

Can anybody explain how to measure the FFD on a RED camera? I assume that using a depth gauge is a bad idear.

Note 35mm PL lenses focus at a FFD of 52.00mm, unlike video lenses, do not have a back focus adjustment. With a film camera a steel block is put in the gate, as a base to measure from. Arri cameras are usually set to 51.98 so that perfect focus is into the film.
Stephen


You will need use autocollimator.
You can use comparison method with standard FFD tools.
The some autocolimators have ruler, and, if you will have special tables you can calculate real FFD.
Arri cameras with normal speeds have FFD 51.98 mm, the high speed ( 150 fps ) 51.96 mm.
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#3 Stephen Williams

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Posted 01 October 2006 - 12:42 PM

You will need use autocollimator.


Hi Olex,

Will that really work on a chip camera? I thought autocollimators were not that accurate.


Many thanks,

Stephen
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#4 Greg Lowry

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Posted 01 October 2006 - 01:03 PM

post deleted by writer

Edited by Greg Lowry, 01 October 2006 - 01:05 PM.

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