05-25-2017, 10:15 PM
Dave, you and your grey sources... 
In None-grey Klaus is right, difference in CH is also around 35%.
But I feel I got enough for it: The collar is great, the Arca rail comes for free. Sigma Contemporary: Additional rail needed, hurts when carrying. Probably better sealing, but I let others step forward to find out about that. The zoom lock at any position is outstanding and very useful. Even better than the Sigma Sports version in this aspect.
As for the other f/1.8 lenses: They are pretty close to the Sigma cousins in terms of performance, but due to the aperture lighter - or am I wrong about that?
In None-grey Klaus is right, difference in CH is also around 35%.But I feel I got enough for it: The collar is great, the Arca rail comes for free. Sigma Contemporary: Additional rail needed, hurts when carrying. Probably better sealing, but I let others step forward to find out about that. The zoom lock at any position is outstanding and very useful. Even better than the Sigma Sports version in this aspect.
As for the other f/1.8 lenses: They are pretty close to the Sigma cousins in terms of performance, but due to the aperture lighter - or am I wrong about that?