Sigma 120-300mm F2.8 EX DG HSM

Announced Feb 14, 2005 •
Telephoto zoom lens | Canon EF, Sigma SA Bayonet, Nikon F (FX)
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By: MsterP (Mar 4, 2015)
Posted to: Open Talk
well back to the all big debate, between these two. well here is my situation. I am a sports photographer at my local University (Utah Valley University). sports are super fun to take photos of, however I personally use my own gear (nikon d7100). I have noticed the marketing team using the all famous 100-400l cannon lens, while i use my 70-200mm sigma lens. of course I feel left out of the those long shots. then again I am not made out of money (I wish i was...) with that said i also shoot...
I have a Nikon D800 and having no luck with focus when using a 2x teleconverter. I've tried both Sigma and Tamron 2x teleconverters on the following lenses. Sigma 70-200 2.8 (non OS version), Tamron 70-200 2.8 VC version, Sigma 120-300 2.8 (non OS version), Sigma 150mm 2.8 macro (non OS version). It will never lock focus, it just pumps back and forth forever hunting. They all work fine without the 2x. My older D300 worked fine with all of these combinations. Any suggestions?
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