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Measuring focus distance


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#1 Nick Norton

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Posted 04 October 2008 - 08:03 PM

What do you guys typically use as a starting point on the camera when measuring your focus distance?



Thanks-
Nicholas
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#2 Alex Worster

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Posted 04 October 2008 - 08:08 PM

The image plane, 99% of the time.
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#3 Jonathan Bowerbank

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Posted 05 October 2008 - 01:14 AM

There are exceptions, some video cameras I hear you have to measure from the front of the lens. I've never worked with those cameras myself, and can't name which ones...but someone here knows ;)
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#4 Stephen Williams

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Posted 05 October 2008 - 03:41 AM

There are exceptions, some video cameras I hear you have to measure from the front of the lens. I've never worked with those cameras myself, and can't name which ones...but someone here knows ;)


Hi,

Most Eng zooom lenses.

Stephen
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#5 Nick Norton

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Posted 18 October 2008 - 02:19 PM

Didn't want to post another topic since i have already posted so many...


I'm having a real difficulty with figuring out how the different lens mounts are supposed to work on the Eclair ACL.

I have the Eclair CA mount right now, but am i supposed to remove this to find a C mount behind it?

I don't want to damage my camera trying to remove the mount without knowing the proper way to do so.


Any help would be appreciated-
Nicholas
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#6 Saul Rodgar

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Posted 18 October 2008 - 02:33 PM

The smaller port on the actual camera (where the mirror is visible) should be a C-mount. You don't have to move the CA mount to see it. If the camera has screws securing the CA to Arri S or B mount, CAREFULLY remove the screws and that should do it

So you can use most 2/3 inch C mount lenses for 16 or 1 inch for S16. There is bevy of C AND CA mount to you-name-it mount adapters: Nikon, Canon EF, Minolta, Leica, PL, Aaton, to name a few.

Some techs, like http://www.lesbosher.co.uk can manufacture pretty much any CA or C mount adapter you can think of, for a price. Or try eBay.

Edited by Saul Rodgar, 18 October 2008 - 02:38 PM.

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