13 oz = 0.368543799 kilograms. Not much in itself but it can be the straw that break the camel's back. Let's say I'm to use a SB800 (or SB900) with it. I sold the Sigma 50-150 for that same reason - I couldn't get a decent shot with it whenever I put the flash on. I'm not sure whether it was because of the weight alone or the balancing of the whole unit. I'm not a big guy.
Originally Posted by jcon
Nikon D90, D80
Nikkor 16-85mm AF-S DX F/3.5-5.6G ED VR, Tamron SP AF 28-75mm F/2.8 XR Di LD Aspherical (IF) macro, Nikkor 50mm F/1.4D, Nikkor 50mm F/1.8D, Nikkor AF-S VR 70-300mm F/4.5-5.6G IF-ED, Sigma 105mm F/2.8 EX DG Macro ||| 2x SB800 | SB600 ||| Manfrotto 190XB