Canon EF 24-70mm f/4L IS USM zoom lens Review by Bryan Carnathan at The-Digital-Picture.

Canon EF 24-70mm f/4L IS USM zoom lens Review by Bryan Carnathan at The-Digital-Picture.

Bryan is very impressed by the macro mode this lens provides:

"Canon has been turning out impressively-performing zoom lenses recently and I was quite excited to see a repeat performance from this lens. After evaluating three retail-purchased copies of this lens, here are my observations. With a wide open f/4 aperture: At 24mm, the Canon EF 24-70mm f/4 L IS USM Lens is very sharp in the center with good sharpness extending to the periphery of the full frame image circle. The 24-70 f/4 L IS gets very slightly softer at 35mm and modestly softer yet (especially in the mid and peripheral image circle) at 50mm f/4 where the lens performs its worst. Sharpness improvement by 70mm

brings the 24-70 f/4 L IS back up to performance similar to that at 35mm. 

 Stopping down to f/5.6 creates a minor improvement in image quality (especially from a noticeable decrease in peripheral shading). Improvement in sharpness is most notable at the long end. Another small sharpness improvement is noticeable in the mid and long focal lengths with an aperture narrowed to f/8. Results remain slightly soft at 50mm. 

 That this lens performs its worst at a mid-focal length vs. an extremity focal length is unusual. Since most people shoot their highest percentage of images at the focal length range extremes of a lens, the 24-70 L IS weakness is perhaps well placed. Roger at LensRentals.com has confirmed the 50mm weakness in his vast stock of this lens."

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