Sigma 50-500mm f/4-6.3 EX DG HSM APO RF Telephoto Zoom Lens
The auto focus is super quiet and reasonably fast in most situations, although mounted on my D30 it does get confused in complex lighting. This is a BIG and HEAVY lens. I use the neck strap provided with the lens, as well as the strap on the camera at the same time. Although I'm probably overcautious, I don't trust the weight of the lens hanging from the camera without extra support. Mounted on a monopod, it is well balanced although following birds in flight presents a challenge. Optically, it's truly beautiful through all f stops. It looks like it will take any abuse I can reasonably give it, being solidly constructed and manufactured to very precise tolerances. I wanted a quality super telephoto and I got one at a great price.
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