I seem to always have trouble with the background being too dark. I use a D300 with SB600 flash. Many times when I shoot in a room and the subject is say two people, they are lit fine, but the background is way too dark. If I turn to a lighted area in the background everything is fine. Flash has always given me trouble (mainly cuz I guess I don't do it enough). I just checked the SB600 manual and realized there is a TTL setting (not TTL BL). Would this setting help this problem? Thanks.