Canon EOS-350D / Digital Rebel XT wide-angle geometry comparison
To measure geometric distortion
we photographed a custom test chart consisting of a grid pattern with perfectly
straight lines. Here are the results for the bundled lenses at their widest
focal length using an aperture of f8 in Aperture Priority mode. The images
were analysed with Imatest using 5th Order line calculation and the full
areas presented here at a reduced resolution.
The image left was taken with the Canon EOS-350D and the 18-55mm EF-S at
18mm f8. Barrel distortion was measured at 3.35% which is slightly better
than the Nikon and Konica Minolta bundled lenses, but not as good as the
Pentax.
Konica Minolta Dynax 5D
Nikon D50
Pentax *istDL
18-70mm DT at 18mm f8
Distortion: 3.49% barrel
18-55mm DX at 18mm f8
Distortion: 3.51% barrel
18-55mm DA at 18mm f8
Distortion: 2.76% barrel
Canon EOS-350D / Digital Rebel XT telephoto geometry comparison
To measure geometric distortion
we photographed a custom test chart consisting of a grid pattern with perfectly
straight lines. Here are the results for the bundled lenses at their longest
focal length using an aperture of f8 in Aperture Priority mode. The images
were analysed with Imatest using 5th Order line calculation and the full
areas presented here at a reduced resolution.
The image left was taken with the Canon EOS-350D and the 18-55mm EF-S at
55mm f8. Pincushion distortion was measured at 0.389% which is barely noticeable.
Konica Minolta Dynax 5D
Nikon D50
Pentax *istDL
18-70mm DT at 70mm f8
Distortion: 0.309% pincushion
18-55mm DX at 55mm f8
Distortion: 0.169% barrel
18-55mm DA at 55mm f8
Distortion: 0.58% pincushion
