三星半
The Pentax SMC DA* 60-250mm f/4 ED [IF] SDM is a highly desirable long tele zoom lens with only minor weaknesses (except QC maybe). It is very sharp through its range and even the secondary aspects such as distortions, vignetting and lateral CAs are well controlled. While not formally tested the high quality of the bokeh (out-of-focus blur) seems to be a differentiator compared to similar lenses - long tele zoom lenses are often problematic here. The build quality is exceptionally high and up to pro standards. The AF operates virutally silent and fast (although not blazingly speedy). All-in-all a sound offer albeit a somewhat pricey one.

F4成像肉