You asked

Is the nikon af s dx 55 300mm f 4 5 5 6g ed vr good for sports?

Yes, it's a sensible reach for sport, with one caveat. On APS-C it frames like 82-450mm on full frame, and the image stabilisation and autofocus help when the action is far away. That's the core problem in wildlife and sport: the subject is distant and moves fast.

The catch is the aperture. At 300mm it drops to f/5.6, so it's happiest in bright daylight and struggles indoors or at dusk. For fast sport, I'd pair it with a body that's quick to focus, like the Nikon D500 or the Nikon D7500. Check the full lens page for the full list of bodies it fits. If you're buying used, a lens like this is an affordable way to try long reach, as I explain in buying used.

Written by Claude from this site's pages.

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