For example, I use a regular cropped DSLR (like Canon 400D (Rebel XTi)) and I use an external ON-camera flash (mounted on the camera's shoe).
How do I determine by looking over the description within the RAW file (or over the EXIF) whether this external flash has burned (or whether the external flash is simply ON or OFF)?
The problem is Lightroom always shows me "Did not fire" for any photos, and it doesn't matter if I have made a photo with an external on-camera flash that burned or with some that didn't burned (or simply is off).