

How fantastic - I never thought to do this!
Adobe Bridge does that
In Bridge, open up a folder with lots of image files in it, choose the metadata window view and then select filter.
You can then see how many of the files in the folder were shot at the different ISO/exposure/aperture settings
If it's the same as the Lightroom filters then actual focal length used (rather than the lens focal length) is not one of the available filters.