2. Employment of special low-dispersion glass elements
The lens employs two large LD (low dispersion) glass elements in its first group to thoroughly compensate for various aberrations and attain high optical quality.
3. Working distance of 100mm, the longest distance among lenses in this class2
Tamron has realized the long working distance of 100mm from the front element of the lens to the subject in 1:1 life-size macro photography. The long working distance 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 capturing the shadow of the lens barrel as is often the case with conventional macro lenses with insufficient working distances.
1As of February 1, 2009, according to our research of 50-60mm life-size macro lenses
2As of February 1, 2009, according to our research of 50-60mm life-size macro lenses
4. Meticulous countermeasures against ghosting and flare
Tamron 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.
1. Lightweight and compact macro lens boasts F/2.0 fast maximum aperture
In order to prevent the lens from becoming bulky due to the fast F/2.0 maximum aperture, Tamron's mechanical engineers thoroughly reviewed the internal constructions of conventional macro lenses and improved the accuracy of precision components by combining Tamron's accumulated mechanical engineering techniques. Through the employment of precision injection-moulded engineering plastic parts with high reliability, Tamron realized a compact body that measures only 73mm ( 2.9in.) in its maximum diameter and weighs a mere 400g (14.1oz.).
2. Internal focusing system for enhanced ease of use
The lens employs an internal focusing (IF) system without changing the overall length of the lens due to focusing. Since the front group of the lens does not extend, the lens is particularly easy to use in close focusing ranges. Tamron has realized the working distance of 100mm, the longest distance among lenses in this class4. The internal focusing system combined with new optical solutions to realize this longer working distance allows the user to enjoy macro photography comfortably while maintaining an adequate distance from subjects.
4As of February 1, 2009, according to our research of 50-60mm life-size macro lenses
3. Full-time manual control mechanism
Delicate focusing 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 auto-focus mode. In addition, the lens employs a large focus control ring to ensure a solid grip and precise control when manually focusing.
4. Simple and attractive outer design
The lens employs a new outer design that is more refined and smoother in its overall contours by minimizing concavity, convexity and variations in its profile to match various digital SLR cameras. The lens barrel features a delicate matte finish, which enhances the high-quality appearance of the lens.