DJDiver

These were all shot at Tracey Arm on an Allen Marine tour with a 100-400 mm lens on a full frame DSLR. Mostly used it at 400mm. I've since replaced the gear with a mirrorless full frame body and a 100-500mm lens, which would have been even better for that little extra reach. Keep in mind the weight of your gear since you'll probably be hand-holding it. There's not a lot of room for a tripod on the boat. Make sure you take some foul weather gear (rain jacket and pants, gloves, hat, etc) so you can stay outside on the deck. Shooting from inside through the windows just won't cut it.