Depth of Field Repealed

SAMCINE David Samuelson & Bill Pollard DoF Calculator

On page 49 of Film and Digital Times February 2018 Edition #86, I wrote, “The difference in depth of field between Large Format and S35, comparing lenses with the same angle of view, is the equivalent of about 2 stops.”

This unleashed a deluge of debate among PhDs, Professors and Lens Designers sprinkled with some solid real-life testing. Is Circle of Confusion still valid? Consensus is not clear.

Uh-oh. It seems that the depth of field could be anywhere from ½ to 1 to 2 stops. So, please do your own tests. And let us know your results.

I’m getting different results when using the same series of lenses on cameras that have the same pixel pitch, like Alexa LF and Alexa SXT (8.25 microns). And something altogether different with different cameras.

And what happens when using 8K cameras with the same resolution: RED MONSTRO 8k VV and RED HELIUM 8K S35? Same resolution, different pixel sizes.

Please post your comments and results.

The lens designers are working on this and will also let us know.

Stay tuned.


The venerable Guild Kelly Calculators showing different DoF for the same focal length in 16mm and 35mm.




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