Hello from a Newbie,
I'm using the ExiftoolGUI on Win7, my camera is a Panasonic Lumix FZ1000.
When exporting EXIF data from ExiftoolGUI as text file, there I find parameters like Hyperfocal Distance or Field Of View.
I do not see these data in an exported HTML file, nor in the ExiftoolGUI itself.
Are these regular EXIF data, written by Panasonic?
Why can't I find them in the HTML and in ExiftoolGUI?
Why doesn't a program like PhotoMe show these data?
Any help is appreciated, thank you.
These are Composite tags (https://exiftool.org/TagNames/Composite.html), derived from the values of other tags.
Perhaps there is an option in the GUI to turn on/off the generation of these Composite tags (corresponding to the exiftool -e option)?
- Phil
Gee, now that's what I call fast. Thank you!
Is it listed somewhere how these values are being calculated, or should this be 'common knowledge'?
All of the gruesome details are in the ExifTool source code (freely available), but for your convenience:
HyperfocalDstance = FocalLength^2 / (1000 * Aperture * CircleOfConfusion)
CircleOfConfusion = (sensor diagonal size in mm) / 1440;
The FieldOfView calculation is significantly more complicated, and also depends on FocusDistance to second order.
The code is in the lib/Image/ExifTool.Exif.pm (https://sourceforge.net/p/exiftool/code/ci/master/tree/lib/Image/ExifTool/Exif.pm) module.
- Phil
Great, many thanks for your help!