The EF 24-70mm f/4L IS USM Lens from Canon is optimized for full-frame 35mm sensors, and another entry into Canon’s high quality L-series of lenses. It has two Super Ultra-low Dispersion (Super UD) and two standard UD lens elements working together to minimize chromatic aberrations, and reduce color blurring around the edges of your subject.
The Canon EF 24-70mm f/4 L IS USM (77mm filters, 1.25 feet/0.38m close-focus, 32.1 oz./910g, about $1,400) is one of Canon's best lenses, with superior optics, great handling, immediate autofocus and excellent mechanics. There's a good reason one is found in almost every pro's bag.
The Canon EF 24-70mm f/2.8L II USM Lens is the sharper lens of this group - even at f/2.8 vs. f/4. Note that the Canon EF 24-70mm f/4L IS USM Lens exhibits some focus shift. Whether it will affect your images or not is questionable." - TDP. DPReview's tests of both lenses shows the 24-70II sharper at f/2.8 than the 24-70IS at f/4.
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canon 24 70mm f 4 l is usm
