What's this? This is based almost entirely on the lens¿s image quality, based on tests of sharpness (modulation transfer function), geometric distortion, reflexes within the lens (flare), veiling glare index, vignetting, and macro performance. Ease of use was also considered.
The Tamron AF 18-270mm F/3.5-6.3 Di II PZD is part of the interchangeable & SLR lens
test program at Consumer Reports. In our lab tests, interchangeable & SLR lenses
models like the AF 18-270mm F/3.5-6.3 Di II PZD are rated on multiple criteria, such as those listed below.
Image quality:
Image quality is based on tests of sharpness (modulation transfer function), geometric distortion, reflexes within the lens (flare), veiling glare index, vignetting, and macro performance.
Modulation transfer function:
This is a measure of lens performance and shows how well a lens reproduces object detail in the image it produces.
Geometric distortion:
All lenses have degrees of geometric distortion, which will depict straight lines as slightly curved. Two most common types are barrel distortion and pin-cushion distortion. These types of distortions are often seen in zoom lenses at both ends of the zoom range.
About This Brand
Tamron currently manufacturers lenses with mounts for Canon, Nikon, Sony, and Pentax cameras. Sony is a major shareholder in Tamron. The company currently sells more than 20 lenses in four different classes: Di (digital integrated) lenses, Di II (for DSLRs with APS-C sized sensors only), SP (super performance, professional lenses), and conventional lenses. Tamron breaks its lenses down into four general categories: all-in-one zooms, fast zooms, wide and tele lenses, and macro lenses.
Features & Specs - Tamron AF 18-270mm F/3.5-6.3 Di II PZD
Kit bodies The SLR camera bodies that are sold with specific lenses.
Kit bodies
Alpha 77V
Zoom ratio The zoom ratio is expressed by a value such as 2x or 3x, and describes the relationship between the longest and shortest focal lengths. For example, a 3x optical zoom with a minimum focal length of 18mm would have a maximum focal length of 54mm.
Zoom ratio
15X
Bayonet This describes which SLR or SLRs a particular lens is compatible with. It's also referred to as a lens mount.
Bayonet
Sony
Weight (oz.) Weight of the lens (without case, pouch or filters).
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Kit bodies
