Thinking about getting the AC adaptor to use in situations where the D90 camera battery may be getting low, but still need to shoot more images. Wondering whether, once connected to the adaptor, will the battery in the camera begin to charge as I continue shooting? Thanks!
Although an AC adapter doesn't charge the internal battery, I've found it very useful for computer controlled time-lapse photos over several hours (flower openings, astrophotography, etc). Batteries can't be trusted for the time needed even if using a multi-power battery pack. Rather than use high dollar Nikon battery pack, I use a lower cost Zeikos ZE-NBG90 for higher capacity battery sessions. For time-lapse sessions running several hours to all night, I change to Nikon's Camera Control Pro 2 and external power with a 12volt UPS setup. Boils down to your specific application.