The primary system that I carry in the field for wildlife photography is a full frame 46MP Nikon D850 and a Sigma 150-600mm 5-6.3 Sports DG OS HSM Lens. Both the body and lens are of metal construction with weather sealing which I consider important features of shooting in the outdoors. I will also note, this body and lens is a heavy combination weighing in at around 9lbs so it may not be right for you.
My secondary system is mainly used for landscape and macro photography. The camera body is a full frame 36MP Nikon D800E and lenses used are a Tokina at-X PRO M 100mm F2.8 D Macro lens and a NIKKOR AF 28mm f/1.8G wide angle lens.
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