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Anyone using wide-angle and ultra-wide angle lenses and/or wide zooms, should use digital lens optimization during their Raw conversion. Digital Photo Profession, DxO Optics Pro, Lightroom and other software will automatically adjust for geometric distortion, chromatic aberration, vignetting, and other distortion at every focal length and every aperture.
I use my EF 24-105mm f/4L IS as one of my main lenses, including critical landscapes on my tripod, with mirror lock-up, low ISO, etc., resulting in seriously sharp images. Without DLO, I was ready to send my 24-105mm back to Canon for adjustment (I'd received clearance to do so), but with it, I'm extremely pleased with prints up to 50" on the long side. (I'm going to try some larger prints).
Dave
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