With a Pentax K-1 you can deside if you use fullformat or APS-C.
There is a composite value:
APS-C:
[EXIF] 0xc61e Default Scale : 1 1
[Composite] - Scale Factor To 35 mm Equivalent: 1.5
FF:
[EXIF] 0xc61e Default Scale : 1 1
[Composite] - Scale Factor To 35 mm Equivalent: 1.0
How is this "Scale Factor To 35 mm Equivalent" calculated? By some metadata? Is there an EXIF or XMP-field where this info can be written, except comment or similar text fields.
What does this field mean:
[EXIF] 0x00fe Subfile Type : Reduced-resolution image
It says with fullformat also reduced.
The Composite tags and the tags they are derived from are listed here (https://exiftool.org/TagNames/Composite.html). ScaleFactor35efl is particularly complex, but the simplest way to set this is to write both FocalLength and FocalLengthIn35mmFormat.
The SubfileType gives the type of image in the given IFD. Use -G1 to see which IFD.
- Phil
Thanks, I am testing, where I can write a crop-factor (the composite value) so that f-stop can read it. Any idea for a field? I assume an EXIF-tag could work, which I would try first before xmp.
I found something, -EXIF:CameraLabel is displayed as unknown tag and -XMP:Label works fine with f-spot.