This past weekend I shot a charity golf event using my GH2. I took a lot of photos and wondered how many I had actually taken. Using the file numbers, I subtracted _1160924 (the first file number) from _1170831 (the last file number). Let's see... 9,907 shots!! Well no; the actual number was 907.
It seems that when the camera hit _1160999, it didn't go to _1161000, it went to _1170001. This isn't a big deal, though it does make counting your shots more difficult. Why would the camera count this way? Is Panasonic reserving the 4th order digit for something special?