The essence of Tamron all-in-one™ optical technology
The superior optical technology in this compact, high-power zoom lens minimises aberrations and maximises image quality. The optical design of this lens includes one LD (Low Dispersion) glass element, two AD (Anomalous Dispersion) glass elements, two Molded-Glass Aspherical elements, and one Hybrid Aspherical element. This formula reduces aberrations to a bare minimum to achieve exceptional class-leading image quality. The 14-150mm zoom is the fruit of Tamron's 20+ years of experience in designing and manufacturing world-class all-in-one™ zoom lenses.
Controls the dispersion of specific wavelengths of light
AD glass is a special type of optical glass that is used to achieve more precise control of chromatic aberrations, thereby enhancing overall imaging performance. Glass of this type provides an abnormally large partial dispersion ratio (amount of diffraction) for light of specific wavelength ranges (colours) within the visible spectrum. By combining AD glass having these special characteristics with elements made of normal glass having different dispersion characteristics, it is possible to control the dispersion factors of a specific wavelength.
This enhanced level of control results much lower levels of on-axis (central) chromatic aberration for telephoto lenses (or zooms used at telephoto settings) and a significant reduction of lateral (peripheral) chromatic aberration for wide-angle lenses (or zooms used at wideangle settings).
Like LD glass, AD glass material is costly but provides clear, vivid image quality.
Far superior image quality – while reducing lens size and weight
Tamron uses several hybrid aspherical lens elements in its lenses bearing the Aspherical designation. The benefits are two-fold: first, their non-spherical shapes virtually eliminate spherical aberration and image distortion. Second, as one hybrid aspherical lens element can take the place of multiple elements without compromising performance, they allow the lens to be much more compact.
As a result, these innovative optics have played a crucial role in delivering uniformly high image quality across all apertures and focal lengths of extraordinarily compact ultra-zoom lenses.
Sharpens edges by reducing 'colour fringing'
Chromatic aberration occurs when a lens element refracts different wavelengths of a ray of light – its rainbow colours – at very slightly different angles. This results in the 'colour fringing' that reduces the sharpness of an image. LD elements are made from special glass materials with extremely low dispersion indices (i.e. the refraction of a ray of light into rainbow colours is extremely narrow). Thus they effectively compensate for chromatic aberration at the centre of the field (on axis), a particular problem at long focal lengths (the telephoto end of the zoom range), and for lateral chromatic aberration (toward the edges of the field) that often occurs at short (wideangle) focal lengths.
Although costly, LD glass materials result in clear, vivid image quality.
A stepping motor for quick, quiet autofocus
The stepping motor's actuator allows precise control of angular rotation, and since it drives the focusing mechanism directly without any intermediary reduction gear, it is also exceptionally quiet. These features also give the lens a seamless, fluid autofocus action when shooting video.
Flower-shaped hood is supplied with the lens to shield stray light
Included as a standard accessory, the flower-shaped hood matches the rectangular shape of the image sensor to most effectively block the interference of superfluous light rays entering from outside the borders of the image area, helping to ensure sharp, clear, flare-free images with crisp detail in the shadow areas.
|Focal length||14-150mm (equivalent to 28-300mm in the 35mm / full-frame format)|
|Angle of view||75°22'–8°15' *|
|Lens construction||17 elements in 13 groups|
|Minimum focus distance||0.5m (19.7 in.)|
|Maximum magnification ratio||1:3.8 (at f=150mm, MOD=0.5m)|
|Overall length||80.4mm (3.2 in.)**|
|Diaphragm blades||7 (circular diaphragm)***|
|Supplied accessory||Flower-shaped Lens Hood|
|Finishes available||Black, Silver|
|Mounts available||Micro Four Thirds|