/ Tokina AT-X 242 AF /
 The AT-X 242 AF is the first lens to start at
24mm and zoom all the way to 200mm, and is currently the widest zoom range available starting
at 24mm. It is constructed using a chrome plated brass mount plate and a combination of
aluminum and composite lens barrels to reduce weight while maintaining strength and durability.
Optically, the 242 uses high quality optical
glass multicoated lens elements created by Hoya Corporation, the world’s largest manufacturer
of optical glass. Two Aspherical lens elements and one SD (super low dispersion) glass element
are employed in the optical design to insure sharpness across the film plane. The aspherical
elements are each molded as one piece of optical glass rather than a resin laminated to a glass
core.
An internal focusing mechanism gives this lens
fast auto focus. Internal focus means the 72mm filter threads do not move during focusing. This
is of great advantage when a special effects filter, such as a circular polarizer, is used.
With an internal focusing lens it is not necessary to readjust the position of the filter every
time the focus is changed. Focus distance is indicated on the manual focus ring.
Like the rest of the lenses in the AT-X series,
The AT-X 242 AF is what is commonly referred to as a parafocal lens, meaning when focus is
achieved at a telephoto focal length, it is possible to zoom back to a wide angle and maintain
focus on the subject.
To fit Canon EOS, Minolta AF, Pentax and Nikon-D
| Focal length: |
24 to 200mm |
| Maximum aperture: |
f/3.5-5.6 |
| Minimum aperture: |
f/22 |
| Optical construction: |
15 elements in 13 groups |
| Aspherical elements: |
Two |
| SD glass: |
2 elements |
| Coatings: |
Multi-layer |
| Angle of view: |
84° 10’ to 12° 20’ |
Minimum focus
distance: |
0.8m (2.9 ft.) |
| Reproduction ratio: |
1: 5.97 |
| Focusing system: |
Internal focusing |
| Zooming system: |
Rotary type |
| Number of diaphragm blades: |
6 |
| Filter size: |
72mm |
Maximum outer
diameter: |
81.8mm (3.2in.) |
| Overall length: |
89.0 mm |
| Weight: |
690 g |
| Accessories, included |
Dedicated lens hood (BH-723), fitted soft case |
© 2001 THK Photo Products,Inc.
www.thkphoto.com
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