The robustly built 7-element in 7 groups design with 6 aperture blades has a minimum focusing distance of 0.30 meters, measures 64mm × 57mm, accepts 55mm filters, and weighs around 284 grams.
The lens, which has little or no mention at all on the Internet, is also said to be sold as the Vivitar MC Wide Angle 28mm F2.8. Where mentioned, the reference could very well be to the other better-known sibling, the Kiron 28mm f/2, rather than to the f/2.8 itself.
The lens is available with various mounts, including the M42, Pentax K, Minolta MD, Canon FD, Nikon F, Olympus OM, and Yashica C/Y.
On APS-C digital SLR cameras with 1.5x crop sensors, a 10.2MP CCD Pentax K-m in this case, the lens equates a 40mm standard (42mm to be exact) prime lens on a 35mm full frame camera, the 'sweet spot' focal length for photography. The versatile focal length mimics human vision with minimal distortion, making it ideal for capturing realistic scenes without feeling too wide or too tight, excellent for travel, street, and documentary photography, as well as for close-up details, architecture, and casual portraits.
In street photography, for example, the focal length will allow for the capture of the atmosphere of the scene while allowing for detailed compositions and framing, and for environmental portraits, the lens provides enough field of view for context, as well as gentle subject isolation and a slight background compression. Its natural perspective adds to the versatility of the lens for documenting daily moments, quiet scenes, and vibrance without feeling too wide or too tight.
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From within interior environments, the slightly wider focal length and potentially close minimum focusing distance allow you to capture dishes at a restaurant table without needing to stand up. Externally, the focal length is wide enough to capture architectural and building scenes without the extreme distortion of wider lenses. The lens makes for a compact DSLR setup that is less conspicuous, letting you blend in with the crowd for candid and captivating moments.
Images, as processed, are uniquely warm and vintage, sharp when stopped down, with minimal vignetting, flaring, or chromatic aberration typical of using the lens on a full-frame camera. While it isn't as razor-sharp when shot wide-open, the lens evokes artistic qualities that legacies have over the 'clinical' clarity and sharpness favored by digital enthusiasts in modern glass. With a closest focusing distance of 0.30 meters, crops and close-ups, as with these images, are exemplary.
The Pentax K-m (K2000 in some regions), launched in 2008, is an entry-level digital SLR camera fitted with a 10.2MP APS-C sized CCD sensor; KAF2 lens mount system; built-in Shake Reduction (image stabilization) and dust removal system; optical viewfinder with approximately 96% field of view and 0.85x magnification; 230,000 dot 2.7-inch LCD screen; ISO sensitivity range from 100 to 3200, with auto ISO control; Auto Picture mode with scene recognition for portrait, landscape, macro, and night scenes; and powered by 4 AA batteries (Lithium, Ni-MH rechargeable, or alkaline).
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