Its zoom range covers wide-to-moderate tele, and its constant f/4 aperture is sort of fast. But optical performance at the 35mm focal length is excellent, with no vignetting at all.
Pentax describes the 17-70mm f/4 lens as a “standard lens with extra zoom,” a cute catch phrase. But “standard zooms,” as they’re called, are one of the most popular lens groups. Using focal lengths from wide to tele really covers a lot of shooting, including scenery, snapshots and portraiture, making the standard zooms very useful.
|Range:||Wide Angle |
|Full-Time Manual Focus Override:||Yes|
|Minimum Focal Length:||17 mm|
|Maximum Focal Length:||70 mm|