I have a Nikon 7000. I am wanting to buy a full frame body but I find all of the information confusing. I would like opinions please. I enjoy travel, wildlife, and nature photography. This year I have been photographing a pair of eagles and I went to Costa Rica. With the eagles and most of the photographs from Costa Rica I pushed my Nikon DX 55-300 1:4.5-5.6 lens to the limit. I am disappointed with my photographs from Costa Rica. I do not know if it was the humidity or me, but I could not get a fast shutter speed. The hummingbirds look like a gaugan nightmare. If I did get the shutter speed up to 1000, the photographs were black if I did not raise the ISO to at least 800. I have never had that problem. Needless to say, the photos on the night tour are fine, but I see photographs with full frame that are much sharper than mine. I have the Tamron 60mm f/2 macro 1:1, AF-S Nikkor 18-105mm 1:3.5-5.6, the Tamron SP 10-24mm 1:3.5-4.5. I think a full frame would give me the quality I want more than another lens. I photograph birds mainly, in all light conditions.