Camera Tracking: recognize focal length from a clip

T

Theiamania

New member
Camera Tracking: recognize focal length from a clip

Hallo everybody,
I made a short clip (dolly) with a Sigma 8 - 16mm but I'm not sure ( damn...i didn't note it) exactly which focal lenght I used: if 12mm or 14 o maybe 16mm:confused:)
There is a way to find a focal length value from a clip? Really easy to have it from a photo but from a video... maybe there's an application for it but warnings, I'm on Mac Osx...

Many thanks!
 
The tracker from The Foundry (http://www.thefoundry.co.uk/products/cameratracker/features/) is able to estimate focal length from your footage. Have a look at the Features site and look for "Focal Length & Film Back Estimation"
I never used this tracker but here are my thoughts: Every camera tracker has to estimate focal length but usually the results are only correct up to a scaling factor. At least if you don't provide the size of your film back. The Foundry claims that their "high tech and production tested solve phase algorithms" can do both.
 
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