Canon EF 70-300mm f/4-5.6L IS USM Lens full-frame review by Ivo Freriks at Camera Stuff Review: The Canon 70-300 mm L is, given its optical performance and solid finish, an attractively priced compact telephoto zoom lens.

The Lens was previously tested with a cropped camera (EOS 650D) and now with a full frame EOS 5D Mark II Dslr body:

"The Canon 70-300 mm L is, given its optical performance and solid finish, an attractively priced compact telephoto zoom lens. The higher vignetting and distortion that you get, when using this lens, makes the total score of the Canon 70-300 mm L review half a point lower than the final score of our Canon 70-300 mm L review on a Canon 650D. Those who shoot in RAW can easily remove this difference by using the standard lens correction profiles in Canon's DPP software, Lightroom or Photoshop. In short, this is a lens to use with pleasure for years.

The Canon 70-300 mm L performs very well in terms of resolution over the entire zoom range with the Canon 5D MK2. The performances clearly state that this lens is part of the professional L-series. The resolution in the center (blue bars) is higher than in the outer corners (red bars). This difference is only measurable and not visible to the naked eye.

Normally, telephoto zoom lenses show a lower resolution at the longest focal length. The resolution becomes slightly lower with the Canon 70-300 L, but the Canon 70-300 mm L still yields a high resolution at the longest focal length.

Pros

Uniformly high resolution over the entire focal length range
Very solid construction; additional protection against splash water and dust
Built-in image stabilization
Low chromatic aberration

Cons

Visible vignetting
Visible barrel distortion at 70 mm and pincushion distortion over 200 mm
Sensitive to flare"

 

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