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#1 Robert Hu

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Posted 10 August 2008 - 04:13 PM

So i was ACing on this 16mm shoot and the DP was using a 10 to 100 zoom lens. When he chose to use 16mm on that lens, we had a focus issue. When I shift focus from foreground actor to the background actors, the size of the image shift too. The DP thought it wont show up on film. When I saw the footage today, the shift did show on film. And it is very apparent that the director don't think it is even usable. Does anyone know what is the cause of this?

Edited by Robert Hu, 10 August 2008 - 04:16 PM.

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#2 Brian Drysdale

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Posted 10 August 2008 - 05:02 PM

It's breathing, the image size changes when you adjust the focus, most zoom lenses have the effect. However, there are some of the shorter zoom range lenses ( like the Canon or Cooke) that only have a very slight or no breathing effect during focus adjustments. The ever present David Mullen explains it here:

www.studentfilmmakers.com/bb/showthread.php?t=3661

The Zeiss 10-100 does breath quite a lot, as do most ENG video lenses.

Edited by Brian Drysdale, 10 August 2008 - 05:05 PM.

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