Tischer's Review of the Canon 28mm F1.8

The following crops were the farthest common point shared between the two lenses, the Sigma being 24mm, and Canon being 28mm. Some may argue that the Canon crop is at the edge of the frame, but this is a full frame lens on a 1.6 crop camera, I think this is a fair comparison.

Canon 28mm f/1.8 VS	Canon 17-40 f/4L	Sigma 12-24mm f/4.5 - 5.6
Canon 28 @ f/2.2 Sharpness = 132
Canon 28 @ f/2.8 Sharpness = 137
Canon 28 @ f/4.0 Sharpness = 137	Canon 17-40 @ f/4.0 Sharpness = 135
Canon 28 @ f/5.6 Sharpness = 141	Canon 17-40 @ f/5.6 Sharpness = 144	Sigma 12-24 @ f/5.6 Sharpness = 146
Canon 28 @ f/8 Sharpness = 142	Canon 17-40 @ f/8 Sharpness = 145	Sigma 12-24 @ f/8 Sharpness = 144
Canon 28 @ f/11 Sharpness = 138	Canon 17-40 @ f/11 Sharpness = 141	Sigma 12-24 @ f/11 Sharpness = 143
Canon 28 @ f/16 Sharpness = 135	Canon 17-40 @ f/16 Sharpness = 134	Sigma 12-24 @ f/16 Sharpness = 138
Canon 28 @ f/22 Sharpness = 124	Canon 17-40 @ f/22 Sharpness = 127	Sigma 12-24 @ f/22 Sharpness = 127

My sharpness rating is based soley on file size. A rating of 91 means the file size is 91Kb. Don't laugh, it seems to work!

It's pretty obvious both zoom lenses are much sharper then the Canon 28mm prime, so I decided not to keep it. The ammount of CA is unacceptable.

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