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What is the CoC for HD & HDV


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#1 James Rydings

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Posted 15 February 2008 - 10:37 PM

What is the CoC for HD (2/3rd inch chip), and HDV (1/3rd inch chip)? And then when using 35mm lenses would the CoC be equal to shooting on 35mm film?
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#2 Andrew Brinkhaus

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Posted 16 February 2008 - 11:53 AM

Depends on how the image will be magnified in the printing or viewing process, and from what distance it will be viewed at. Obviously, a smaller image created by the lens has to undergo stronger magnification to be viewed. This is why, from the DOF standpoint, it does matter the size of camera a lens of a certain focal length is used.

For example, a frame of 35mm has the size of 24×36 mm. To be printed as a typical 30×40 cm (12×16 inches) enlargement, or viewed on a 20" screen, it has to be magnified 12.5 times (depending on the aspect ratio.) For the same print size, an image created on the 2/3" sensor (6.6×8.8 mm) will require a magnification of about 50×. The circle of confusion has to be five times smaller to give a similar perceived sharpness of the projected image.
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