Note: Item is fully working and is in an excellent condition. Please inspect the images before buying.
Tamron is well known and highly regarded for its Adaptall range of interchangeable-mount lenses which can be used on a wide variety of cameras with the appropriate mount (not included - see below). This wide angle lens is optically fine but quite well used, and comes with front lens cap.
28mm is the most popular focal length for wide lenses, being much wider than a standard lens, but not so wide that distortion is too obvious. The diagonal angle of view is around 75 degrees on film or full frame digital cameras. It's the ideal wide angle lens for landscapes, interiors, group shots, travelling, architecture, and many other types of subject. Fixed focal length (prime) lenses like this typically offer quality at least as good as much more expensive zooms, and wider apertures at lower prices.
The maximum aperture of f/2.5 is faster than the more common f/2.8 and f/3.5 types, and gives a brighter image in the viewfinder, easier focusing and faster shutter speeds than slower zooms. Stops down to f/22 with half stops to f/16. Automatic diaphragm and full aperture metering (with suitable cameras and mounts), plus AE setting for cameras with shutter priority and program modes. This doubles as an f/32 setting with some mounts. Very close focusing to under 0.25m (10 inches). The focusing ring is large, with rubber grip, and easy to use. A depth of field scale and infra red focusing index are provided.
Tamron BBAR (Broad Band Anti Reflection) multicoating to reduce flare against the light, and increase contrast. Standard, compact 49mm filter thread, which does not rotate when focusing, which makes the lens much easier to use with polarising, graduated or square filter systems and other accessories. Optical construction is 7 elements in 7 groups.
The lens is extremely well made (in Japan) and finished with a metal barrel, smooth controls, clear colour-coded markings and an excellent standard of fit and finish. It's compact at under 45mm (1.75 inches) long at infinity, and weighs just 175g. Tamron model 02B.