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Non-Centric Ground Glass


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#1 AnnuVikshi Kanal

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Posted 16 February 2008 - 09:12 AM

Some Motion Picture camera viewfinders are provided with non-centric ground glass. What is the thinking behind this? How does one insure the correct composition?

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#2 David Auner aac

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Posted 16 February 2008 - 12:25 PM

Some Motion Picture camera viewfinders are provided with non-centric ground glass. What is the thinking behind this? How does one insure the correct composition?


Hi Kanal,

what do you mean by that? That the space outside of the frame guides isn't equal on all sides? Or do you mean non-reflex finders?

Cheers, Dave
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#3 Stephen Williams

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Posted 16 February 2008 - 03:15 PM

Hi Kanal,

what do you mean by that? That the space outside of the frame guides isn't equal on all sides? Or do you mean non-reflex finders?

Cheers, Dave


Hi Dave,

I think he is referring to Academy ground glasses that leave a space for the sound track. Only Super 35 is centered.

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#4 David Auner aac

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Posted 16 February 2008 - 05:34 PM

I think he is referring to Academy ground glasses that leave a space for the sound track. Only Super 35 is centered.


Hi Stephen, that's a good theory. But what does that have to do with framing? I mean the guides are in the correct place and so will the picture be? Or am I missing something here?

Cheers, Dave
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#5 David Mullen ASC

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Posted 16 February 2008 - 05:40 PM

Either you are shooting in 35mm using Full Aperture / Super-35, which is centered, or a sound aperture like Academy, Anamorphic, or standard 1.85, etc., which is shifted to the right.

Your gate may always be full aperture, but your lens may be off-centered, along with the groundglass, because you are shooting for making a contact print with a soundtrack that will take up the left edge of the print. So your framing leaves room on the left for the soundtrack area to be added to the contact print.

The black area shows the projector masking, note the left side is masked to hide the soundtrack area:
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