Canon 16-35 f/2.8L vs 16-35 f/4L IS vs 17-40 f/4L

In a galaxy not so far away...a comparison of Canon's Ultra Wide Angle Zoom L lenses - 16-35 f/2.8L(http://bit.ly/16-35f28), 16-35 f/4 IS L(http://bit.ly/16-35f4) and 17-40 f/4L(http://bit.ly/17-40f4)

Pricing Reference:
Canon EF 16-35mm f/2.8 L II USM Lens
http://www.digitalrev.com/product/canon-ef-16-35mm-f/MTg4NQ_A_A
Canon EF 16-35mm f/4L IS USM Lens
http://www.digitalrev.com/product/canon-ef-16-35mm-f/MTEwMzQ0MQ_A_A
Canon EF 17-40mm f/4 L USM Lens
http://www.digitalrev.com/product/canon-ef-17-40mm-f/MjE_A
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Видео Canon 16-35 f/2.8L vs 16-35 f/4L IS vs 17-40 f/4L канала DigitalRev TV