Tamron AF 18-250mm F/3.5-6.3 Di-II LD Aspherical Macro Zoom Lens for Canon Digital SLR Cameras

Sunday, June 6th, 2010 at 7:36 am

Tamron AF 18-250mm F/3.5-6.3 Di-II LD Aspherical Macro Zoom Lens for Canon Digital SLR Cameras
Product Description
AF18-250mm F/3.5-6.3 Di-II LD Aspherical (IF) Macro (Model A18), is a lightweight, compact and ultra high power zoom lens designed exclusively for digital SLR cameras with APS-C sized imager sensors. The AF18-250mm F/3.5-6.3 Di-II LD Aspherical (IF) Macro is the ultimate high power zoom lens boasting the zoom ratio of 13.9X.Amazon.com Product Description
Tamron's high-power 18-250mm zoom lens is a photographer's dream come true. While conventional 35mm film cameras typically require two lenses to cover 28-388mm, the Tamron 18-250mm lens does it in one, with a 13.9x zoom level delivering enormous photographic freedom in a single compact housing. The life of a digital photographer has never been better.

Despite achieving the ultra telephoto capabilities of a 388mm lens (35mm equivalent), this Tamron zoom lens sports an extremely compact optical system. Unlike previous Tamron lenses, the lens optimizes the power distribution of the entire optical configuration without using XR glass, letting you achieve both ultra-high-power magnification and a minimal size. In addition to offering low dispersion (LD) glass to eliminate chromatic aberration and sharpen ultra-long shots, the lens offers such special materials as hybrid aspherical elements and anomalous dispersion (AD) glass to achieve three goals at once: increased magnification, compact size, and improved image quality.

Macro Photos and Fighting Glare
The Tamron 18-250mm is great for macro photos, too, with a maximum magnification ratio of 1:3.5 letting you fill the frame with a subject approximately the size of a business card. As a result, you can easily and conveniently enjoy close-up (macro) photography of flowers, insects, and more. Tamron has also adopted various countermeasures against ghosting and flare, common problems in digital photography. The lens employs internal surface coating and new multilayer coating technology to minimize reflections that occur when light enters through the front element, while also reducing image-degrading effects caused by the imagers themselves.

Lens construction: 13 groups and 16 elements
Diagonal angle of view: 75 to 6 degrees (33 to 23 feet)
Horizontal angle of view: 65 to 5 degrees (36 to 19 feet)
Vertical angle of view: 46 to 3 degrees (21 to 19 feet)
Diaphragm blade number: 7
Minimum aperture: f/22
Minimum focus distance: 17.7 inches
Macro magnification ratio: 1:3.5
Filter diameter: 62mm
Accessory: Flower-shaped lens hood
Dimensions: 2.9 inches in diameter and 3.3 inches long
Weight: 15.2 ounces

Tamron AF 18-250mm F/3.5-6.3 Di-II LD Aspherical Macro Zoom Lens for Canon Digital SLR Cameras