/ Tokina AT-X 300 AF PRO /
 The AT-X 300 AF PRO lens features the exclusive
Focus Clutch Mechanism, a signature of the Tokina PRO series lenses, which provides a
faster, smoother auto focus operation and a smooth manual focus action not normally found in
todays auto focus lenses.
As with all the lenses in Tokinas AT-X AF series,
the AT-X 300 AF PRO is constructed using all aluminum lens barrels and a chrome-plated, brass
mount plate. The first lens group is made from two elements of high quality SD (super low
dispersion) glass that minimizes the secondary spectrum caused by chromatic aberration. These
lenses use FK01 and FK02 optical materials which gives them SD (APO) qualities.
The AT-X 300 AF PRO lens also features a patented
IRF, Internal Rear Focus system. This system moves smaller lens groups within the lens barrel,
which is useful for long telephoto lens designs. The IRF system has a number of advantages
including faster auto focusing and more compact lens design.
To fit Canon EOS, Minolta AF, and Nikon-D
| Optical Construction |
9 Elements / 7 Groups |
| Angle of View |
8°20' |
| Minimum Focus Distance |
2.4m (7.9ft) |
| Aperture Range |
f/2.8-f/32 |
| Coatings |
Multi-layer |
| Focusing System |
Internal Rear Focus (IRF) |
| Number of Diaphragm Blades |
9 |
| Filter Size |
112mm/35.3mm |
| Diameter |
117mm (4.5") |
| Length |
187mm (7.3") |
| Weight |
2,300g (80.0oz) |
| Lens Hood (Included) |
MH112N |
2001 THK Photo Products,Inc.
www.thkphoto.com
|
