My Sony DSC-H1 has a tube with 58mm threads for mounting converter lenses and/or filters. Among the lenses available from manufacturer itself are a 0.7x wide converter, an 1.7x tele converter, and a macro converter (don't remember the scale right now).
The camera settings menu has an entry for specifying any of those converters. What will be the consequences?
I can think of three things: different ranges for focus hunting (no point in looking beyond ∞) and different scale for manual focus display, different ranges for the built-in zoom (no point in going to full tele with a wide converter and vice versa), and different motion shake compensation (a wide converter will warrant less optical correction for the same amount of angular displacement of the camera, a tele converter will warrant more).
I am pretty sure that the first two are implemented (and they actually limit what you can do) but would the third be likely?
The user manual makes no mention whatsoever about why one should try specifying the right kind of converter. It does mention that zoom/focus ranges get constrained. But that does not sound like being overly useful.
EDIT: Movement of the lenses stays safely behind the tubus threadings for all unmodified settings, so I doubt that mechanical safety is an issue here. The usual EXIF data is not impacted with either unannounced or announced converter lens (and doesn't tell the focusing distance, but the focus length stays the same) but the Sony MakerNotes entries might contain some info. Too bad that
exiftool does not manage to decipher it.