Just been looking on the Jessops site from the earlier link posted.
The Tamron 70-300mm lens is a quality zoom lens which usually retails for £99 to £130ish so this is a real good bargain if you have either a Pentax or Samsung DSLR.
Tamron now offers a lightweight, compact, high-image-quality telephoto zoom lens with macro capability of 1:2 that can be used with digital cameras. This new lens is a Di type lens using an optical system with improved multi-coating designed to function with digital SLR cameras as well as film cameras.
With this 70-300mm telephoto zoom lens, flipping a macro switch in the focal length range of 180mm to 300mm obtains a maximum magnification ratio of 1:2 at a minimum focus distance as short as 37.4", enabling close-up shots of flowers, insects, and other objects that normally require the use of a specially designed macro lens. Moreover, this is a zoom lens that casually offers the distant capture and foreshortening effect pleasures of the 300mm ultra-telephoto world.
Lens Construction (Groups/Elements): 9/13
Angle of View: 34°21'-8°15'
Type of Zooming: Rotation
Diaphragm Blade Number: 9
Minimum Aperture: F/32
Minimum Focus Distance : 59in.(1.5m) in normal setting/ 37.4" (0.95m) in macro mode (f=180mm-300mm range)
Macro Magnification Ratio: 1:2 (at f=300mm MFD 0.95m)
Filter Diameter: ?
Weight: 435g (15.3oz)
Diameter x Length: ? x 4.6in. (?6 x 116.5mm)
Mount: Pentax AF