DOF when using "zoom in to focus" technique at DVinfo.net

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Sony TRV950 / PDX10 Companion
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Old July 18th, 2004, 07:15 AM   #1
Tourist
 
Join Date: Jun 2003
Location: London, UK
Posts: 4
DOF when using "zoom in to focus" technique

Hi, I'm using a TRV950 for short film development. I use the following technique to focus:
(1) I zoom in to fill the frame with the subject
(2) Focus
(3) Zoom out

While this is foolproof, I'm curious how this technique might affect the depth of field. Is it the case that I will end up with a greater depth of field than if I were to focus at the original focal length without first zooming in?

Thanks,
Nick.
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Old July 18th, 2004, 07:46 AM   #2
Warden
 
Join Date: Mar 2002
Location: Clearwater, FL
Posts: 8,267
The three primary factors of DOF are F Number (aperture), Distance to Subject, and Focal Length of the Lens. Your method of achieving critical focus is fine and will not effect DOF.
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