Most zoom lenses have some distortion present and the wider angle and longer focal length range zoom lenses tend to have the most distortion. Stopping the lens down one stop eliminates most of the vignetting, but 15mm likes f/8 even better.ĭistortion is not a 15-85 IS (shown mounted on a Canon EOS 7D above) strength area. Slightly more vignetting is visible at 85mm (about 1.5 stops in the corners) and the most vignetting is present at 15mm where about 2.5 stops of light is lost in the corners. There is just enough light falloff to be noticed (about 1 stop) in the corners at wide open apertures over the entire focal length range. The most noticeable change in image quality when stopping down is the reduced vignetting. While it does not look like a center-of-the-frame crop and shows a little typical wide angle corner distortion, it looks great compared to most similar lenses. The small image below it is a CA-corrected 100% crop from the absolute lower left corner from that image. The above photo was shot with a Canon EOS 7D. The EF-S 15-85 shows slight improvement in sharpness when stopped down to f/8, but really, little improvement is needed. The Canon EF-S 15-85mm f/3.5-5.6 IS USM Lens is sharp to the corners even with a wide open aperture.Ĭorner performance is slightly weaker from 50-70mm with a wide open aperture, but still not bad. This is not a Canon L Series Lens (as of the date of this review, Canon has not released an EF-S L lens),īut the 15-85 IS has many L lens qualities including three aspherical elements and one UD glass element. Yes, there are lenses with longer focal length ranges, but few go as wide as 15mm and they usually offer compromises - typically where it hurts the most - image quality.Īnd image quality is one area where this lens delivers. Upgrading Your Computer is like Buying Time – Save 10-15% on All Dell Outlet Home Laptops and Desktops.Alien Throne and Milky Way, Valley of Dreams, New Mexico.Canon RF 135mm F1.8 L IS USM Lens Tested on EOS R7.Sony to Announce New Vlogging Camera on May 23rd, 2023 at 10:00 AM ET.In Today's B&H Deal Zone: Manfrotto Blue Chroma Key FX Portable Background Kit (13.1 x 9.5') – Only $299.88 (Save 68%), Lexar, Tascam, Benro, Shape.Expectations for the Canon RF 100-300mm F2.8 L IS USM Lens, MTF Chart Comparison.B&H #1 Seller SanDisk 4TB Extreme PRO Portable SSD V2 - Only $299.99 (Save $700.00).
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