focal length

I took a bunch of HDR images and forgot to record the focal length. The Nikon Coolpix 5400 zoom does not show it anyway. Is there a way to derive it or get it somehow from the images? These are jpegs.

Martin Moeck, Penn State

Hi Martin,

Most Nikon cameras record the focal length in the Exif header, which you can read using the "File Info..." menu item in Photoshop, or using Nikon's own viewing software, available as a trial version from their website:

  http://www.nikonusa.com/template.php?cat=1&grp=276&productNr=NikonView

-Greg

···

From: "Martin Moeck" <[email protected]>
Date: January 4, 2006 11:10:55 AM PST

I took a bunch of HDR images and forgot to record the focal length. The Nikon Coolpix 5400 zoom does not show it anyway. Is there a way to derive it or get it somehow from the images? These are jpegs.

Martin Moeck, Penn State

Martin,

Most Nikon cameras record the focal length in the Exif header

.. just to confirm what Greg said: I've put a text file with the EXIF info
of a 4500 up under:
http://luminance.londonmet.ac.uk/webhdr/pickup/NIKON__E4500.exif

I don't have a 5400 in my little collection. This is as close as it gets.

Just pulling three lines out of this file:
FocalLengthIn35mmFormat => 38
FocalLength35efl => 7.8mm (35mm equivalent: 38.0mm)
FocalLength => 7.8mm

Voila! Your're in business.

You might want to take a look at the Reveal software which is available
for LINUX, MacOS, and even Windows:
http://albumshaper.sourceforge.net/index.shtml
It's a GUI thing allowing you to read and edit the EXIF info.

And of course there's alwas Perl::Image::Exiftool, if you're into
automating and scripting... Look on CPAN.org

Cheers

Axel

Superb, thank you very much.

Martin

···

________________________________

From: [email protected] on behalf of Axel Jacobs
Sent: Wed 1/4/2006 9:00 PM
To: Radiance general discussion
Subject: Re: [Radiance-general] focal length

Martin,

Most Nikon cameras record the focal length in the Exif header

.. just to confirm what Greg said: I've put a text file with the EXIF info
of a 4500 up under:
http://luminance.londonmet.ac.uk/webhdr/pickup/NIKON__E4500.exif

I don't have a 5400 in my little collection. This is as close as it gets.

Just pulling three lines out of this file:
FocalLengthIn35mmFormat => 38
FocalLength35efl => 7.8mm (35mm equivalent: 38.0mm)
FocalLength => 7.8mm

Voila! Your're in business.

You might want to take a look at the Reveal software which is available
for LINUX, MacOS, and even Windows:
http://albumshaper.sourceforge.net/index.shtml
It's a GUI thing allowing you to read and edit the EXIF info.

And of course there's alwas Perl::Image::Exiftool, if you're into
automating and scripting... Look on CPAN.org

Cheers

Axel

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