Feature Request: Specifying Focal Length is too cumbersome – the solution would be awesome simple

[Vendrel]

I see that the program defaults to 30mm as the Focal Length when this data is missing from an image's EXIF data.

In many cases, the source of the image may be unknown, perhaps originating from social media, so the Focal Length is missing. The cumbersome workaround is to use an EXIF editor: load the image file, navigate, type in the data, and save the image file.

The following solution could be incredibly simple from both the user and software development perspectives: write it into the filename.

Suggested Solution

Instead of:
image-filename.jpg → Focal Length is missing → 30mm
Make this:
image-filename-fl60.5.jpg → Boom, no EXIF editor needed, it's just a lazy renaming step.
^^^^^^^

So the application should simply watch for a '-fl'+numbers part before the file extension and then completely ignore if there's a Focal Length value in the file's EXIF data or not.

This way, we can easily try out multiple Focal Length's in a single bundle even with an unknown Focal Length, simply by duplicating and renaming the same image file.
image-filename001-fl15.jpg
image-filename001-fl25.3.jpg
image-filename001-fl40.jpg
etc.