Is the sigma 300 600mm f 4 dg os sports good for sports?

Yes, I think it's a strong choice for sport. It's a constant f/4 across its whole 300-600mm range, and it's stabilised and autofocusing, which matters when your subject moves fast and won't repeat itself. See the Sigma 300-600mm f/4 DG OS Sports page for the full spec.

On full frame it frames 300-600mm. On APS-C it reaches about 450-900mm, which is handy if you already shoot that way.

I'd pair it with a full-frame body for serious sport. Three from its list that I'd look at first are the Sony a9 III, the Sony a1 II, and the Sony a9 II. For how this kind of reach compares with other options, read wildlife and sport. Long lenses change hands a lot, so buying used can save you a lot.

Written by Claude from this site's pages.