This line of ultra-high-performance lenses is designed and manufactured to the exacting specifications demanded by professionals and others who require the highest possible image quality. The foremost priority is achieving superior performance parameters – high design standards take priority over cost constraints. As a result, Tamron SP lenses feature innovative designs that have established an enviable reputation for excellence amongst demanding photographers.
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.
Broad-Band Anti-Reflective coating
Cleaner, crisper images without flare or ghosting
Tamron has employed new BBAR (Broad-Band Anti-Reflection) multi-layer coatings in order to ensure optimum performance in all photographic situations. The new BBAR coatings enhance the light transmission factors in both the short and long wavelength ranges, a condition that was thought incompatible with conventional anti-reflection coating technology. In addition, Tamron employs internal surface coatings (coatings on cemented surfaces of lens elements) for sharpness, high colour reproduction performance and superior colour balance.
Super Performance series
Performance takes priority for superb image quality
Focusing elements inside the optical design make for better handling
In many lenses, the front elements move back and forth to alter the focus distance. With an internal focusing (IF) mechanism, the focusing elements are inside the optical design. Because the front lens elements remain static, the lens’ actual length does not change. This provides several benefits both to the image and during photography:
- The barrel is not subject to stray light entering from external helicoids that can adversely affect image quality
- A non-rotating front filter thread makes it easier to use filters such as graduated filters and polarisers
- A flower-shaped lens hood will remain in the correct position to most effectively shield the lens from stray light
- Better balance and more predictable handling because the lens length does not change during focusing
- Generally, a much closer minimum focusing distance throughout the zoom range
- Improved optical performance by minimising loss of illumination at the corners of the image field (vignetting)
- Suppression of other aberrations that become more troublesome at different focusing positions.
Integrated focus cam optimises internal focusing
Tamron's Integrated Focus Cam is a precision mechanical component that optimises the co-ordinated movement of the Internal Focusing (IF) system with the Multiple Cam Zoom Mechanism. This ingenious mechanism ensures accurate and seamless positioning of all the internal elements within the lens and coordinates them with the external zoom and focus controls.
Working distance of 100mm, the longest distance among lenses in this class**
Tamron has realised the long working distance of 100mm from the front element of the lens to the subject in life-size macro photography, the longest among lenses in its class*. This allows the user to take macro shots while maintaining a sufficient distance from such subjects like timid insects that are likely to escape if you move in too close. Also, with this longer working distance, you can prevent the shadow of the lens barrel interfering with lighting of the subject as often occurs with the short working distances of 1:1 macro photography.
Full-time manual control mechanism
Fine focus control is essential in macro photography. The lens incorporates a full-time manual control mechanism that enables the user to manually adjust focus without engaging the AF/MF switchover button, even when in the autofocus mode. The large focus control ring ensures a solid grip and precise control of manual focusing.
* As of 1 February 2009, according to Tamron's research of 50–60mm life-size macro lenses
- Tamron’s conversion value is 1.55x.
- Di II lenses are designed exclusively for use with digital SLR cameras equipped with APS-C size image sensors and employ an optical system optimised for the characteristics of those digital cameras. Di II lenses are not designed for use with 35mm film cameras or digital SLR cameras with image sensors larger than 24mm x 16mm.
- The special note “APS-C size equivalent” is hereinafter omitted.
|Angle of view (APS-C size)||26°35'|
|Lens construction||14 elements in 10 groups|
|Minimum focus distance||0.23m (9.1")|
|Maximum magnification ratio||1:1|
|Minimum working distance||100mm (3.94") from front of lens|
|Overall length*||80mm (3.15")|
|Maximum diameter||73mm (2.9")|
|Supplied accessory||Lens Hood|
|Mounts available||Canon AF, Nikon AF-D**, Sony (Konica Minolta)|