Tested @ 35mm f/4:
Canon 17-40mm f/2.8L
Canon 28-235mm f/3.5-4.5
Sigma 18-50mm f/2.8
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Resized to 640x427 pixels:
Canon 17-40mm f/2.8L: ISO 100, 1/3s, f/4
Sigma 18-50 f/2.8: ISO100, 1/3s, f/4
Canon 28-235mm f/3.5-4.5: ISO100, 1/2s, f/4
Sharpness: 100% crops
Canon 17-40mm f/2.8L: ISO 100, 1/3s, f/4
Sigma 18-50 f/2.8: ISO100, 1/3s, f/4
Canon 28-235mm f/3.5-4.5: ISO100, 1/2s, f/4
