Originally posted by dtmateojr Let's try to analyze this for a bit. Why would I buy the 20-40 over the Tamron 17-50/2.8 or Sigma 18-35/1.8? For the WR? If I get into a situation where WR might help I have more important things to worry about: my pictures. Getting a decent shot when rain or salt spray has covered the front element is close to nothing.
More likely it would be very close to $$$ for a new lens without WR, at least in this part of the world. I was caught in a terrific downpour this afternoon but as I had a fully weather-sealed kit I wasn't too worried. Had I had to pack my camera away, I'd likely have missed the amazing rainbow which appeared immediately afterwards. If you live in a wet climate or shoot in spray-laden places, weather-sealing is almost obligatory and not an optional extra, imho. YMMV, etc.