Tamron 70-200MM Tele-Zoom lens
PMA 2010 Report
Mr. Morio Ono, President of Tamron has announced the development of the SP AF70-200mm F/2.8 Di LD (IF) MACRO, a lightweight, high-performance and fast tele-zoom lens designed for SLR cameras with full-size image sensors. The new SP AF70-200mm Di LD (IF) MACRO (Model AA001) is an F/2.8 fast tele-zoom designed for full-size format SLR cameras. It inherits the product concept of the award-winning SP AF28-75mm F/2.8 XR Di standard zoom lens that is highly acclaimed for its compactness and speed, which lets photographers enjoy a high cost to performance uniqueness. The lens is supplied with a lightweight and rigid aluminum tripod grip ring that can be mounted or detached in a one-touch action.
Tamron SP Tele-Zoom lens
While overall dimensions are confined to the absolute minimum, the new SP AF70-200mm F/2.8 Di LD (IF) MACRO zoom lens is packed with features that allow stress-free photography: a versatile MFD (minimum focusing distance) of just 0.95m (37.4”) over the entire zoom range; an excellent maximum macro magnification ratio of 1:3.1 at f=200mm; and an advantageous internal focusing (IF) system. The new tele-zoom lens enables the user to cover a desirable focal length range of 70mm medium telephoto to 200mm telephoto when mounted on full-size format SLR cameras and a focal length range from 109mm to 310mm equivalent ultra telephoto (7°59’ angle of view) when mounted on a DSLR camera with an APS-C sized imager.
Tamron Tele-Zoom lens - MFD over the zoom range
This zoom lens, designed for use with full-size format SLR cameras, boasts a fast maximum aperture of F/2.8, yet it allows close-focusing down to 0.95m (37.4”) over the entire zoom range. The maximum magnification ratio is 1:3.1 at the 200mm tele-end. The filter diameter is confined to Ø77mm as a result of the use of an advanced optical design pursuing optical power distribution.
Tamron Tele-Zoom lens - Soft out-of-focus effect & Sharp depiction
In order to realize soft out-of-focus effect and sharp depiction performance at the same time, the zoom lens uses three LD (low dispersion) elements. As a result, the optical system effectively compensates for lateral and on-axis chromatic aberrations that are major image-degrading factors in telephoto photography, in order to provide edge-to-edge sharpness and high-contrast image quality with flat-field characteristics over the entire zoom range in various situations.
Tamron SP AF70-200MM Tele-Zoom lens
The lens features a fast maximum aperture of F/2.8, yet it weighs a mere 1,112.6 grams (39.2oz.), since it uses barrel parts made of engineering plastic materials having excellent dimensional stability and sufficient strength for professional use and even industrial applications. Through the use of “Internal Surface Coatings” (i.e., multiple-layer coatings on cemented surfaces of plural elements) and multiple-layer coatings to prevent reflections from lens surfaces, ghosting and flare due to reflections that occur when light enters through the front element as well as reflections caused by the imager itself in the mirror box are reduced to the absolute minimum.
Tamron SP AF70 - One-touch AF/MF Switchover mechanisms
The models for Nikon and Canon cameras are equipped with AF/MF switchover mechanisms to allow one-touch switchover from AF mode to MF mode or vice versa electronically and mechanically by simply sliding the button. (Sony and Pentax systems require AF/MF switchover operation on both the camera and lens.) Since the lens uses an IF (internal focusing) system, the focusing ring does not rotate during focusing, which ensures good holding balance at all times. In the MF mode, focusing is performed as easily and comfortably as with an MF lens. Since the overall length of the lens does not change due to zooming or focusing, it offers excellent operability and holding balance. A flower-shaped lens hood is included as a standard accessory. The special hood provides optimum shading of superfluous light rays that enter from the rectangular frame outside the image field.