While actively reviewing a lens, I generally have it mounted and ready to capture any appropriate subject that comes available. On this day, it was a raccoon that provided the entertainment and the Sigma 150-600mm f/5-6.3 DG OS Contemporary
was fortunately the mounted lens.
If you could use long focal lengths in a relatively small, light and affordable package, this lens is worth considering. With the 600mm focal length and image stabilization, I was able to capture this image handheld from a distance long enough to avoid scaring the critter away.