![]() Just like other Zuiko Pro lenses, the 17mm f/1.2 is a premium lens with a premium construction that's rugged, weather-sealed (with lens mount gasket, too) and feels great in the hand. The 17mm f/1.2 Pro's build quality is fantastic. ![]() But, for those who have not, here's the run-down. If you've handled the earlier 25mm f/1.2 or read our review of that lens, then you'll be familiar with the size, weight and build quality of the 17mm f/1.2 Pro. Beyond f/8, however, we do measure a slight increase in vignetting (approximately 0.25EVs or thereabouts) between f/11-f/16.Īs mentioned at the beginning, the 17mm f/1.2 is more or less physically identical to the 25mm f/1.2 and 45mm f/1.2. ![]() Wide-open, corner shading measures a bit over a half-stop of light falloff as you stop down, vignetting decreases steadily, going below 0.25 stops by around f/4-f/8. Vignetting is far from problematic from the 17mm f/1.2, but it is measurable and noticeable at the wider aperture - not all that surprising for a bright, wide-angle lens. At the maximum, there is still very little barrel distortion, significantly under 0.5%. On average, the distortion level hovers right above the zero mark towards the barrel distortion direction. wide-angle focal length, the Olympus 17mm f/1.2 displays almost no significant geometric distortion. Olympus' in-camera JPEG processing should have no problem clearing that up, or if you edit RAW files, a few quick adjustments in your editing software of choice should quickly clear up any CA that may appear. Looking closely at our test shots, CA is very subtle and more or less contained out towards the corners in the form of slight cyan and magenta fringing on high contrast edges. By our measurements, we found CA is the most minimal at the widest aperture, before increasing slightly and plateauing around f/5.6 and beyond. Chromatic AberrationĬhromatic aberration is, overall, very well controlled. Even diffraction-related softening is very minimal, with only a minimal dip in sharpness starting around f/11 and continuing until f/16. Stopping down slightly, we measure a subtle increase in sharpness, but nothing that would scare us away from using f/1.2 - you'll get tack-sharp photos wide open and stopped down. The lens is exceptionally sharp at both the center and in the corners at f/1.2, which is very impressive, especially for a wide angle lens with this bright an aperture. ![]() SharpnessĪs we've experienced with Olympus Zuiko Pro lenses, both zooms and primes, the level of sharpness and detail these lenses can resolve is fantastic. Here are the lab results that lead to and support that verdict. If you're a regular to IR, you'll likely already be aware that we awarded the 17mm f/1.2 Pro the top spot as the Best Wide Angle Prime for 2017 in our annual Lens of the Year awards. Here, we'll take a detailed look at our full lab testing of the wide-angle 17mm f/1.2 Pro lens. Besides the focus on image sharpness as well as bokeh quality, Olympus also made a particular point (and significant optical engineering effort) to create all three f/1.2 Pro primes with nearly the same physical dimensions, and all there sharing a 62mm filter thread. To follow the 25mm, Olympus created both a 17mm f/1.2 Pro and a 45mm f/1.2 Pro, which offer prime fans 35mm-equivalent and 90mm-equivalent options, respectively, in addition to the 25mm's 50mm-eq.
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