For the purpose of this review the smc Pentax-DA 16-45mm F/4 ED AL was used with Pentax K-5 DSLR camera.
The images which illustrate this review were developed in Capture One WITHOUT correction of distortion, vignetting and lateral chromatic aberrations, WITHOUT sharpening and increasing of overall contrast, brightness, saturation and WITHOUT changing of any other settings, except for vividness.
Visually the lens is very sharp at the center of the frame at focal lengths of 16-24 mm and the sharpness remains very good with zooming to focal length of 45 mm. The edges of the frame slightly lag behind the center but can be described as very good. All in all it’s an excellent result for a standard zoom lens.
Distortion is strong barrel at the focal length of 16 mm and can be a problem if you prefer to shoot architecture. Fortunately it becomes weaker with zooming and won’t be a big problem approximately starting from the focal length of 24 mm.
Vignetting is strong at the most problematic combination of focal length 16 mm and F/4. It looks like darkening of the corners of the frame. Vignetting becomes weak with closing of the aperture by 1 or 2 stops. At focal lengths of 24 and 45 mm vignetting is weak already at F/4 and remains weak with further closing of the aperture.
Lateral chromatic aberrations are large at focal lengths of 16-24 mm but become small with zooming to 45 mm.
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