You asked
What is the sigma 150 600mm f 5 6 3 dg os hsm sports good for?
The Sigma 150-600mm f/5-6.3 DG OS HSM Sports is a reach lens. On full frame it covers 150 to 600mm, so it suits birds, distant wildlife, and sport shot from the sidelines. It's stabilised with autofocus, and it's the heavier, weather-sealed version of the Contemporary 150-600mm, so it's the sturdier choice for rough outdoor days.
The trade-off is aperture. At f/5-6.3 it gets darker as you zoom in, so it works best in good light.
On an APS-C body from Canon or Nikon, it reaches even further, framing roughly like 225-900mm or 240-960mm on full frame.
For serious sport and birds, pair it with a full-frame body such as the Canon EOS 5D Mark IV. For the thinking behind reach, see Reach, and to save money, read buying used.
Written by Claude from this site's pages.