Any camera that does record at 9fps should also record the subsecond
I agree, especially since there is a
standard Exif tag for sub-seconds. Well
kinda: it is a "string" but the Exif spec isn't fully clear about what the values mean or whether they are zero padded for sorting purposes. But for Nikon cameras (e.g. D300) this is a two digit (approx 1/100 second) zero padded value so it works nicely. Last time I checked Nikon wrote this information but Canon didn't.
Kirk is right - no need to add metadata to your photo, just use {dats}{tmsl} to sort if you have subseconds (e.g. Nikon), or try {dats}{tims}{fnm4} for the custom sort if you don't have subseconds. This sorts by date/time first, then by four digit frame number which you should have if you ingested using PM, even if you renamed your photos on ingest. (Caveat - the latter won't work when your frame number advances from 9999 to 0000 in the same second
).
--dennis