Up to $310 off on Sigma and Tamron lenses. Super deal on the Sigma 135mm f/1.8! SonyAlpha Admin 2 years ago The Sigma 135mm f/1.8 has a super $313 discount at BHphoto. But nearly all Sigma/Tamron E-mount lenses are discounted: Up to $300 off on Sigma lenses at BHphoto, Amazon, Adorama. Up to $100 off on Tamron lenses at BHphoto, Amazon, Adorama.