[Guest]

Yes, that is what I think too. I don't believe I get a 15mm view at the 16mm of the 16-35mm lens without distortion correction in post processing. Otherwise I will be very happy with the high distortion.

 

popphoto determines focal length (somehow). For the Canon 18-55 IS kit, it gives the focal length as 18.61mm tested. That at 0.55% barrel (at Dxomark it's about 0.9% max, at slrgear it's 0.9% max, and about 0.55 % average, ok, seems it's all consistent based on Dxomark). This is very different from photozone barrel at 3.2% though?? The grid does sort of look similar though. Just some different way of measuring then?

 

Anyway, seems there are nice curves at Dxomark that show the distortion as focal length across the radial field

 

So, the 18mm goes from 18mm in the center to 17.2 at the edge.

 

 

for the 16-35 mark I, you get 16.6 mm in the center, and 15.7 towards the edge.

http://www.dxomark.com/Lenses/Canon/Cano...m-F28L-USM

 

check under measurement, distortion, profile.

 

Hmm, it does look like m43 takes into account correction.

this is for the Panasonic vario 14-42 lens 

http://www.dxomark.com/Lenses/Panasonic/...842#tabs-2

Center is 13.8mm, edge is 12.3mm

 

And the Olympus Ed 14-42, is 13.1 to 12.1mm.  

http://www.dxomark.com/Lenses/Olympus/Ol...era%29/842

 

So, seems no cheating   ;-)