Just a comment on when file and shooting dates get confused. I prefer all my photos to have the file date as the shooting date and sometimes this can get messed up, especially if you use some namespace from a camera manufacture to copy files from the camera. Opus can easily modify any of the file dates from the internal EXIF data shooting date. There's a very nice script available to do this
For information on the technique used in this button see: "Abusing" Rename Scripts to do other things with file info
[url][OBSOLETE] "Abusing" Rename Scripts to do other things with file info]
Also there are many other things one sometimes needs to do which are difficult without but very easy with Opus. As an example, at Xmas I forgot to set the time zone when travelling so all my photos were off by 3 hrs so I used a simple command buttons to modify the internal meta data in the images themselves, then used the script above to correctly set the file dates on my computer photo store.
SetAttr META datedigitized:+3:00
SetAttr META datetaken:+3:00