The Sony-mount version of the Sigma 50-500 “Bigma”. The Bigma is probably the widest range telephoto zoom available in a high quality lens.It is a favorite among nature shooters and everything-shooters for its great range and good image quality. Nothing else does quite what this lens does.
There are trade-offs, of course. This is such a large lens that for most photographers a tripod is needed to produce really sharp images unless the light is excellent.