To measure geometric distortion we photographed a chart consisting of
a grid pattern with perfectly straight lines. The lenses were tested at
their widest focal lengths with an aperture of f8. The images were analysed with Imatest using 5th
Order line calculation and the full areas presented here at a reduced resolution.
An excellent result for the 7-14mm lens here, which exhibits minimal distortion
when zoomed-out. This is particularly impressive given the extreme wide
angle nature of the lens at this focal length. Indeed it shows less geometric
distortion than most DSLR kit lenses, along with Canon's 17-40mm L.
To measure geometric distortion we photographed a chart consisting of
a grid pattern with perfectly straight lines. The lenses were tested at
their longest focal lengths with an aperture of f8. The images were analysed with Imatest using 5th
Order line calculation and the full areas presented here at a reduced resolution.
Zoomed-in, the 7-14mm again exhibits minimal geometric distortion, and considerably
less than either of the kit lenses at the same 14mm focal length (see results above).
The 7-14mm performs very well in this test.
