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A note on my longish file names:

They contain parts seperated by underscores:

1. Date of capture (YYYY-MM-DD)
2. Time of capture (hh-mm-ss)
3. my initials (or somebody else's as required)
4. a sequence number (from the occasion, not inside this presentation)
5. Aperture
6. Exposure time (T1-0100 is a hundredth of a second, T000010 is ten seconds)
7. Focal length (adjusted for full frame)
8. ISO value
9. Crop factor (only few newer pics, after I got a second camera)