Here are some comparison shots using a 1Dmk2 with 1.3x crop factor.


Lens test @ 28mm Center Crop

Tamron 28-75 f/2.8 @ 28mm Canon 17-40mm f/4L @ 28mm

full image

Tamron f/2.8

Tamron f/4

Canon f/4

Tamron f/5.6

Canon f/5.6

Tamron f/8

Canon f/8

Tamron f/11

Canon f/11

Tamron f/16

Canon f/16

Tamron f/22

Canon f/22



Lens test @ 28mm Edge Crop

Tamron 28-75 f/2.8 @ 28mm Canon 17-40mm f/4L @ 28mm

full image

Tamron f/2.8

Tamron f/4

Canon f/4

Tamron f/5.6

Canon f/5.6

Tamron f/8

Canon f/8

Tamron f/11

Canon f/11

Tamron f/16

Canon f/16

Tamron f/22

Canon f/22