My "day work" is in the Natural Gas industry on production sites. Using anything electrical, like a camera with a battery installed is possible but it's a logistical nightmare; permits, extra people, gas meters, approval for each session of shooting ... all because it poses the very real risk of igniting gas that may be leaking. This makes snaps close to impossible. I want to solve this problem with a fully manual Nikon SLR, one that can at least shoot nicely without the battery installed and I'd also like the "T" setting for long exposures elsewhere in my life. Any suggestions?