I'm looking to get a new lens, and have narrowed it down between these 2; Canon EF 70-200mm f/2.8L USM Telephoto Zoom vs. Canon EF 70-200mm f/2.8L IS II USM Telephoto Zoom. The first one is just USM for $1,500 and the second the IS II USM is $2,500. With such a price difference, I'm wondering what the real difference is, and if the second is really worth the extra money?
I occasionally take family pictures, but I'm usually taking western pictures of horsemen gathering cattle and such, or scenery.
I have the Canon T3i.
I am looking to upgrade from an old Tamron 70-300mm.