LensCoat® Sigma 50-500 OS

I was worried the neoprene would be too bulky, but it actually fits perfectly and doesn't interfere with the zoom ring at all. The added padding gives me real peace of mind when I'm out in the field.

The rubberized coating gives just enough grip to feel secure even with sweaty hands, and it's saved my lens from a few nasty scrapes already. Snug fit and easy to install, no complaints here.

Slapped this on before a dusty safari trip and it took every scrape from branches and rocks without a single tear. The coverage is snug over the zoom ring, so I can still adjust focal length without wrestling the fabric. Resale value’s safe now, which was my main worry with a lens this pricey.