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Need a special circle of confusion


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#1 Nicholas A Micros

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Posted 07 April 2010 - 01:22 PM

I need help finding my CoC with an odd medium. Shooting 1920x1080 with a 1/2 sensor (EX3 6.4mmX4.8mm) and the film is intended to screen on an 30' - 60' projector.

There is not an sure answer for uprez. So I want to play it safe and say 4k.

Giving the frame a 2.8444 magnification.

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#2 John Sprung

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Posted 07 April 2010 - 02:44 PM

This is a case where theory math are probably going to be a waste of time. There are too many variables. You'd do better to shoot a diagonal newspaper test, and pick your circle size based on that. To calculate DOF tables with the circle of your choice, try this spreadsheet:

http://www.auner.net/misc/DOF/DOF.xls





-- J.S.
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#3 Nicholas A Micros

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Posted 07 April 2010 - 03:05 PM

This is a case where theory math are probably going to be a waste of time. There are too many variables. You'd do better to shoot a diagonal newspaper test, and pick your circle size based on that. To calculate DOF tables with the circle of your choice, try this spreadsheet:

http://www.auner.net/misc/DOF/DOF.xls





-- J.S.



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