DOF calculations... at DVinfo.net

Brendan Pyatt · April 29th, 2009, 01:07 PM

Hi,
This feels like a stupid question to be asking but its bugged me for a while!

Using a DOF calculator like this one:
Online Depth of Field Calculator

When it asks for focal length do I put in the real focal lens of the Z5 lens or the 35mm equivalent? 82mm or 590mm for max zoom on the Z5.

Thanks!

Barron Thompson · April 29th, 2009, 02:05 PM

I too have had the same question.
The calculations seem to make sense if you enter:
4.1 for the focal length (mm) when the lens is wide and
82 when the lens is at max zoom.
Both numbers are found in the manual under specifications.

And don't forget to enter 1/3 inch sensor in the field above; Camera, film format or circle of confusion.

April 29th, 2009, 01:07 PM	#1
Brendan Pyatt Regular Crew Join Date: Sep 2005 Location: Southampton UK Posts: 165	DOF calculations... Hi, This feels like a stupid question to be asking but its bugged me for a while! Using a DOF calculator like this one: Online Depth of Field Calculator When it asks for focal length do I put in the real focal lens of the Z5 lens or the 35mm equivalent? 82mm or 590mm for max zoom on the Z5. Thanks!

April 29th, 2009, 02:05 PM	#2
Barron Thompson Regular Crew Join Date: Jan 2008 Location: Burlington, Ontario Posts: 67	I too have had the same question. The calculations seem to make sense if you enter: 4.1 for the focal length (mm) when the lens is wide and 82 when the lens is at max zoom. Both numbers are found in the manual under specifications. And don't forget to enter 1/3 inch sensor in the field above; Camera, film format or circle of confusion.