Upload & Sell: On
I've tried and/or used many different third party lenses. I currently have a Sigma 70-200 OS that easily betters the Canon v.1 and is "close enough" to the v.2. I also have a Rokinon 8mm fisheye, which is awesome, but manual focus. I'm looking forward to receiving a Sigma 24-70 that I recently acquired in exchange for a Sigma 10mm fish. At one time or another, I've also tried the Tamron 70-300 VC, Sigma 70-300 OS (though just because it came in a lot I picked up on ebay), Tamron 17-35 (nice alternative to the 17-40, a little slow focusing),...Show more →
I too have the lastest Sigma 70-200mm f/2.8 with OS - I actually had the Canon 70-200 L Mk II alongside the Sigma for a week and I simply couldn't tell the difference between them in the resulting images - the Canon focused a tad quicker, but not $1,000 quicker and there was no real discernable difference in the final images - yes the canon was ever so slightly better, but only for the most crazed of pixel peepers. Much to my own surprise, I sent the Canon back. I have the Sigma 50mm f/1.4 and its a little soft at f/1.4 but from f/2 it's awesome. I also have the Tokina 16-28 f/2.8 and its my bread and butter Real Estate lens. I used to be exclusively Canon, but the only Canon glass I have left is the 85 L mk ii and the 35L... Everything else is 3rd party.
My advice is try 'em out and get them from reputable places with liberal return policies (B&H, Adorama, e.g.) and see if they meet your needs... If not, send them back...