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depth of field


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#1 Daniel Madsen

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Posted 08 January 2006 - 11:05 AM

What is most important in achieving a 35mm like depth of field with HD. Is it the CCD size, lens type or both?
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#2 Ignacio Aguilar

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Posted 08 January 2006 - 11:34 AM

It's a combination of factors.

Since the CCD is smaller than 35mm on HD cameras, you tend to use shorter focal lenghts to cover the same angle o view (the opposite also comes true with film formats larger than 4-perf 35mm). Short focal lenghts have inherently more depth of field than telephoto lenses, so that's why you end up having more depth with HD than 35mm.

To avoid this, one should try to use long lenses whenever is possible and NDs to open up the iris, since deep stops also increase the depth of field.

Hope it helps.
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#3 Stephen Williams

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Posted 08 January 2006 - 12:30 PM

. Short focal lenghts have inherently more depth of field than telephoto lenses,


Hi,

If you match the image size and F stop on the same format, the DOF is the same regardless of focal length of the lens used.

Stephen.
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#4 Ignacio Aguilar

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Posted 08 January 2006 - 12:43 PM

Hi,

If you match the image size and F stop on the same format, the DOF is the same regardless of focal length of the lens used.

Stephen.



Yes, of course. I should have used the word "tends" instead of "inherently".
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