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        KLDSLR Retail Store

        We will open every day at 10AM to 7PM daily.
        Address : KLDSLR Lot 61-4A, Jalan SS2/75, 47300 Petaling Jaya

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        Canon EF 17-40mm F/4L USM vs Canon 16-35mm F/2.8L II USM

        - by Lens Reviewer

        Today, I will compare both Canon popular zoom lens, Canon EF 16-35mm F/2.8L II USM and Canon EF 17-40mm F/4L USM. I will be using Canon 5D Mark III which is a dslr with full frame sensor to test these both lens. I will be testing the image quality, lens build quality, features and focusing speed.

        Lens Specification

        Model Canon EF 16-35mm F/2.8L II USM Canon EF 17-40mm F/4L USM
        Focal Length 16-35mm 17-40mm
        Weather Sealed Yes Yes
        Filter Size 82mm 77mm
        No. of Diaphragm blades 7 7
        Magnification 0.22X 0.24X
        No. of elements 16 12
        No. of groups 12 9
        Angle of view 108.2-63 104-57.5
        Max. diameter 89mm 84mm
        Max. Length 112mm 97mm
        Weight 640g 475g


         

         

         

         

         

         

         

         

         

         


        Now, I will show you how to lens look like.

        Canon 16-35mm is longer and bigger

        Conclusion

        Canon 16-35mm is bigger and longer


         

        Comparison of Inner Part of Mount of Both Lens

        Canon EF 16-35mm F/2.8L II USM

        Un-extended

        Extended

        Canon EF 17-40mm F/4L USM

        Un-extended

        Extended


         

        Vignetting Test (Left is 16-35mm; Right is 17-40mm)

        Images are crop 25% of the whole image from middle to left top.

        16mm vs 17mm from F2.8-F22

         

        20mm from F2.8-F22

         

        24mm from F2.8-F22

         

        28mm from F2.8-F22

         

        35mm from F2.8-F22

         

        40mm from F4-F22

        Conclusion

        16-35mm has 1-stop better vignet control.


        Image Quality Test: 16-35mm is left, 17-40mm is right

        16mm vs 17mm from F2.8-F22

         

        20mm from F2.8-F22

         

        24mm from F2.8-F22

         

        28mm from F2.8-F22

         

        35mm from F2.8-F22

         

        40mm from F4-F22

        Conclusion

        16-35mm

        • 16mm: Sharp at F2.8-F8
        • 20mm: Sharp at F2.8, Sharper at F4-8
        • 24mm: Sharp at F4 & F8, sharpest at F5.6
        • 28mm: Sharp at F4 & F11, sharpest at F5.6-8
        • 35mm: sharp at F2.8-F5.6, sharpest at F8

        17-40mm

        • 17mm: Sharp at F4 & F8, sharpest  at F5.6
        • 20mm: Sharp at F4 & F8, sharpest at F5.6
        • 24mm: Sharp at F4 & F8, sharpest at F5.6
        • 28mm: Sharp at F4 & F8, sharpest at F5.6
        • 35mm: Sharpest at F5.6, sharp at F8
        • 40mm: Sharpest at F5.6, sharp at F8-11

         

        Conclusion

        Canon EF 16-35mm F/2.8L II USM

        Pros: F2.8, 16mm, vignet disappear from F5.6 above, sharp at F4 on all focal length, less vigneting compared with 17-40mm, sharper than 17-40mm on all focal length

        Cons: Expensive, 600g++, bigger, 35mm only.

         

        Canon EF 17-40mm F/4L USM

        Pros: Cheap, light, 40mm, sharp at F5.6 on all focal length

        Cons: 17mm, F4, no vignet from F/8 above, Sharp only from F/5.6 above


        More photos can be available at Flickr