Sigma 18-35mm with constant 1.8f

[hamlet]

You are referring to the F-stop? But aren't there cheaper lenses with f1.4? I don't really understand?

 

[Gavjenks]

Hamlet, it's good because it zooms AND it has a really wide aperture AND that aperture stays constant (the constant part is important for video in particular).

Yes, you can already buy a 35mm f/1.4. But it doesn't zoom AT ALL.
Or you can already buy basically the same range in, for instance, a Canon 16-35mm lens, but it only goes to f/2.8. (1.3 stops slower is a lot!).

This does it all at once and for a very reasonable $800ish price

 

[hamlet]

I see. So its the quickness, versatility and price of this lens that is causing all this commotion. I will head to the local shop to see if this lens is really as good as people say it is.