The Tamron AF 18-250 mm f/ 3.5-6.3 Di II LD Aspherical (IF) Macro (Model A18) is a very compact, universal 13.9x superzoom lens for digital APS-C (crop) cameras of major brands.
The lens is positioned as a universal solution for traveling and as an everyday kit lens. It will suit beginning photographers as a perfect device for determining his/her own preferred focal lengths.
It features rather an attractive price-capabilities relation.
Equivalent focal length: 27-375 mm. At a maximum focal length of 250 mm the lens extends and becomes twice as long.
The optical scheme of the lens includes two aspherical elements, two LD elements and one AD element. However, aberrations are rather notable. There is a pronounced barrel distortion at wideangle and chromatic aberrations, especially in the telephoto position.
Vignetting is rather pronounced at open apertures up to f/7.1, especially at f/ 3.5 at a focal length of 18 mm, and at f/5.6 at a focal length of 250 mm.
The Tamron AF18-250mm F/3.5-6.3 Di-II LD Aspherical (IF) Macro focusing is not very fast and rather noisy. Nevertheless, focusing is accurate, as a rule. Occasionally hunting is observed when focusing, especially in low light conditions. Focusing is internal.
Color rendering is natural, colors are not saturated. Contrast is average.
Side and back light is well handled by the lens, but it is better to use the hood.
The 1:3.5 scale macrography is available (at 250 mm).
The Tamron AF18-250mm F/3.5-6.3 Di-II LD Aspherical (IF) Macro lens is suitable for all principal types of photography. This is a good choice for traveling.
It comes complete with a petal hood.
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Posted by: Sergei Borodin Date of publication: 23.09.2010