Preliminary Specifications
|
Model |
A001 |
|
Lens Construction (Groups/Elements) |
13/18 |
|
Angle of View
( )=the figures when used on APS-C sized digital camera |
Diagonal: 34°21'-12°21' (22°33'-7°59') |
|
Horizontal: 28°51'-10°17' (18°49'-6°38') |
|
Vertical: 19°16'-6°31' (12°22'-4°15') |
|
Diaphragm Blade Number |
9 |
|
Minimum Aperture |
F/32 |
|
Minimum Focus Distance |
37.4in.(0.95m) throughout the range |
|
Macro Magnification Ratio |
1:3.1 (at f=200mm, MFD: 0.95m)) |
|
Filter Diameter |
ø77mm |
|
Weight |
40.6oz (1150g) (without tripod mount) |
|
Diameter x Length |
ø3.5 x 7.6in.
(ø89.5 x 194.3mm) |
|
Accessory |
Flower shaped lens hood & case included |
|
Mount |
Canon
Nikon (with Built-In Motor for use with all Nikon DSLR cameras)
Pentax
Sony |
* values given are for Nikon AF-D cameras.
* The cosmetic design and specs are subject to change without notice.
Main Features
0.95m (37.4") MFD over the Entire Zoom Range for 1:3.1 Maximum Magnification Ratio
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 f77mm as a result of the use of an advanced optical design pursuing optimum optical power distribution.
Soft Out-of-Focus Effect and Focus-Point Contrast
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 photographic situations.
Lightweight fast F/2.8 Maximum Aperture
The lens features a fast maximum aperture of F/2.8, yet it weighs a mere 1.1 kg (39.2oz.)*, since it uses barrel parts made of engineering resin-filled materials having excellent dimensional stability and appropriate strength for professional use and industrial applications.
(*) As of February 2007, based on Tamron's research of lenses in the same class, excluding the tripod base.
Internal Surface Coatings Minimize Ghosting and Flare
Internal Surface Coatings (i.e., multiple-layer coatings on cemented surfaces of multi-element lens groups) and multiple-layer coatings prevent reflections off lens surfaces, reducing ghosting and flare that occur when light enters through the front element. These coatings also reduce reflections caused by digital imaging sensors in the mirror box of digital SLRs.
One-touch AF/MF Switchover mechanisms for Canon and Nikon mount
Models for Nikon and Canon cameras are equipped with AF/MF switchover mechanisms, permitting one-touch switchover from AF mode to MF mode or vice versa electronically. Mechanical switchover is achieved 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. This ensures good balance at all times and makes the use of circular polarizing or square format filter systems much easier to operate.. In the MF mode, focusing is performed as easily and comfortably as with a pure Manual Focus lens. Since the overall length of the lens does not change due to zooming or focusing, it offers excellent operability and hand-held balance.
Detachable Tripod Grip Ring
The lens is supplied with a lightweight and rigid removable alloy tripod socket.
Petal-shaped Lens Hood
A petal-shaped lens hood is included as a standard accessory, providing optimum shading of superfluous light rays that enter from the rectangular frame outside the image field.
