Sharpness test: Sigma 18-50 3.5-5.6 DC

This is a comparison of the actual sharpness of a lens, at different apertures and focal lenghts. Several shots are processed by Lens Sharpness Review, then left for interpretation.

Computed sharpness results

At 18mm: sharpest at f/10 (overall), f/10 (center), f/8 (corner)
At 26mm: sharpest at f/11 (overall), f/11 (center), f/7 (corner) (I supposed overall f/9)
At 34mm: sharpest at f/13 (center and corner)
At 50mm: sharpest at f/18 (center and corner)

Details of high-resolution pictures

First picture from each row is corner pic, second is center pic with the same aperture. All pictures are 100% crops of original JPEGs.

At 18mm

Corner image, f/3.5

Center image, f/3.5

Corner image, f/4

Center image, f/4

Corner image, f/4.5

Center image, f/4.5

Corner image, f/5

Center image, f/5

Corner image, f/5.6

Center image, f/5.6

Corner image, f/6.3

Center image, f/6.3

Corner image, f/7.1

Center image, f/7.1

Corner image, f/8

Center image, f/8

Corner image, f/9

Center image, f/9

Corner image, f/10

Center image, f/10

Corner image, f/11

Center image, f/11

Corner image, f/13

Center image, f/13

Corner image, f/14

Center image, f/14

Corner image, f/16

Center image, f/16

Corner image, f/18

Center image, f/18

Corner image, f/20

Center image, f/20

Corner image, f/22

Center image, f/22

At 26mm

Corner image, f/4

Center image, f/4

Corner image, f/4.5

Center image, f/4.5

Corner image, f/5

Center image, f/5

Corner image, f/5.6

Center image, f/5.6

Corner image, f/6.3

Center image, f/6.3

Corner image, f/7.1

Center image, f/7.1

Corner image, f/8

Center image, f/8

Corner image, f/9

Center image, f/9

Corner image, f/10

Center image, f/10

Corner image, f/11

Center image, f/11

Corner image, f/13

Center image, f/13

Corner image, f/14

Center image, f/14

Corner image, f/16

Center image, f/16

Corner image, f/18

Center image, f/18

Corner image, f/20

Center image, f/20

Corner image, f/22

Center image, f/22

Corner image, f/25

Center image, f/25

Corner image, f/29

Center image, f/29

At 34mm

Corner image, f/5

Center image, f/5

Corner image, f/5.6

Center image, f/5.6

Corner image, f/6.3

Center image, f/6.3

Corner image, f/7.1

Center image, f/7.1

Corner image, f/8

Center image, f/8

Corner image, f/9

Center image, f/9

Corner image, f/10

Center image, f/10

Corner image, f/11

Center image, f/11

Corner image, f/13

Center image, f/13

Corner image, f/14

Center image, f/14

Corner image, f/16

Center image, f/16

Corner image, f/18

Center image, f/18

Corner image, f/20

Center image, f/20

Corner image, f/22

Center image, f/22

Corner image, f/25

Center image, f/25

Corner image, f/29

Center image, f/29

Corner image, f/32

Center image, f/32

At 50mm

Corner image, f/5.6

Center image, f/5.6

Corner image, f/6.3

Center image, f/6.3

Corner image, f/7.1

Center image, f/7.1

Corner image, f/8

Center image, f/8

Corner image, f/9

Center image, f/9

Corner image, f/10

Center image, f/10

Corner image, f/11

Center image, f/11

Corner image, f/13

Center image, f/13

Corner image, f/14

Center image, f/14

Corner image, f/16

Center image, f/16

Corner image, f/18

Center image, f/18

Corner image, f/20

Center image, f/20

Corner image, f/22

Center image, f/22

Corner image, f/25

Center image, f/25

Corner image, f/29

Center image, f/29

Corner image, f/32

Center image, f/32

Corner image, f/36

Center image, f/36

Additional information

Original pictures look like this:
Full picture

Body type: Canon EOS 350D DIGITAL.

Generated by Lens Sharpness Review and edited in 03/2006