Is the sigma 100 400mm f 5 6 3 dg os hsm contemporary long enough for birds?

Short answer: on full frame, no. At 100-400mm it runs out before the 600mm-equivalent reach that birds usually need. On an APS-C body it does much better. The Wildlife and sport guide notes that this lens frames like 150-600mm on Nikon APS-C and about 160-640mm on Canon APS-C, so a body like the Canon EOS 80D or Nikon D7500 gets you into bird territory.

If you shoot full frame and birds are the goal, look at the Sigma 150-600mm f/5-6.3 DG OS HSM Contemporary. It covers the reach the guide recommends. For more on picking between these, see My picks, and consider buying used, since long lenses hold their value.

Written by Claude from this site's pages.