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

Yes, for wildlife it's a strong choice. It's a constant f/4 zoom from 300 to 600mm, stabilised and with autofocus, so it reaches most animals you'll meet at a distance. On full frame it frames as marked. On APS-C it behaves like 450-900mm, which is a lot of reach, though f/4 there gives about the depth of field of f/6.

Some bodies it fits that I'd pick:

• Sony a9 III or Sony a1: for birds and anything that moves quickly.
• Sony a7 IV: a sensible all-rounder if wildlife is one of several things you shoot.
• Sony a6700: APS-C, so you get the 450-900mm reach on a smaller body.

For the bigger picture on long lenses, see wildlife and sport. Long lenses hold their value well, so buying used can save you a lot.

Written by Claude from this site's pages.