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The Tamron 28-300mm f/3.5-6.3 Di PZD Lens for Sony is a wide-angle to telephoto zoom lens for Sony A-mount full-frame and APS-C cameras. It provides users with an extremely versatile all-purpose lens in a compact design and on APS-C cameras it has a zoom range equivalent of 42-450mm. Also, it has an aperture range from f/3.5-6.3 to f/22-40 across the zoom range.
The 28-300mm is also capable of decent macro capabilities with a reproduction ratio of 1:3.5 when zoomed in to 300mm. This is due to a minimum focus distance of 19.3". Also, for excellent image quality, numerous special glass elements are used in the lens design in addition to Broad-Band Anti-Reflection coatings. There are one Hybrid Aspherical element, three Molded-Glass elements, four Low Dispersion elements, one Extra Refractive Index element, and one Ultra-Extra Refractive Index element.
For general use, there is a Piezo Drive autofocus system which is powered by a fast and quiet standing-wave ultrasonic motor. This allows you to quickly achieve focus for sharp images. And, included with the lens are a flower-shaped lens hood as well as front and rear lens caps.
This lens features full-time manual focus capabilities
Lens construction of 19 elements in 15 groups
Angle of view of 75°23' to 8°15' on full-frame cameras and 52°58' to 5°20' with APS-C format cameras
Uses 67mm threaded filters
Seven diaphragm blades
Broad-Band Anti-Reflection coating minimize flare and ghosting for sharp, high contrast imagery
Aspherical elements work to correct spherical aberrations and limit distortion
Low dispersion elements reduce color fringing and chromatic aberrations in an image
XR and UXR elements help to decrease the size of the lens, enabling this zoom lens to remain compact