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The new lens is noticeably smaller and lighter than the 24-70 mm., although its front element is about the same diameter. It is a more conventional zoom in that it extends with the focal length; the 24-70 mm gets longer as the focal length gets shorter, which makes its lens shade, fixed to the mount and not the end of the lens, more effective.
At the rear of the new lens is rectangular baffle, presumably to reduce any reflections from the parts of the rear element which are not used to form the 24 by 36 mm rectangular image.
Both lenses are classic “L” construction – heavy, solid, smooth and sealed against the elements.
"Big Tub Light, Tobermory. A view from my home I use for practical lens testing.Canon 24-70 mm at 34 mm, 1/500th at f8, ISO 100, Aug. 2005"
I tested the two lenses on Canon 1Ds Mark II on a sturdy tripod at ISO 100, checking focal lengths 24, 35, 50 and 70 mm; I used f4, f5.6 and f8. Images were identically processed in Adobe Camera Raw aft...

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Michael Reichmann
Michael Reichmann
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Michael Reichmann is the founder of the Luminous Landscape. Michael passed away in May 2016. Since its inception in 1999 LuLa has become the world's largest site devoted to the art, craft, and technology of photography. Each month more than one million people from every country on the globe visit LuLa.
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