- Auto focus fisheye zoom lens.
- Up to 180 degree angle of view.
- Water repellent optical coating on front element.
- Suitable for DX/APS C type sensors.
Product Description
-------------------
Tokina Lens f/3.5-4.5 AT-X 107 DX Fish Eye (Canon Fit)
------------------------------------------------------
Tokina Lens f/3.5-4.5 AT-X 107 DX Fish Eye (Canon Fit) The
Tokina 10-17 mm Fish-Eye Zoom gives the photographer a 180 degree
field of view with dramatic curvature of field. In a test carried
out by Amateur Photographer in July 2008, this lens was awarded
87%.
Water Repellent Coating
-----------------------
The front element of the AT-X 107 DX has a WR or "Water
Repellent" optical coating on the glass. This coating makes marks
such as spots left by water or finger-prints much easier to clean
than standard multi-coating.
Designed to be Compact
----------------------
The rear optical group of the lens contains 1 SD (Super-Low
Dispersion) glass element to reduce the number of elements
(pieces of glass) in the optical design in order to make the lens
more compact, light-weight and faster focusing.
Specifications:
---------------
* Focal length: 10 to 17 mm
* Maximum aperture: F/3.5
* Minimum aperture: F/22
* Optical construction: 10 elements in 8 Groups
* SD glass: One elements
* Coatings: multi layer
* Angle of view: 180 degrees - 100 degrees
* Minimum focus distance: 5.5 ins
* Macro ratio: 1:2.56
* Zoom system: Rotary type
* Number of diaphragm blades: 6
* Filter size: N/A
* Width: 70 mm
* Height: 71 mm
* Weight: 350 g
* Built in lens hood
Tokina Optical Technology
-------------------------
Aspherical Optics
-----------------
A standard lens is made up of a combination of spherical lens
elements. Individual "lenses" within the lens are commonly
referred to as "elements". A spherical element has an even curve
to the surface of the glass. However, there can be problems with
such elements; light entering the centre of the lens and light
entering at the edge may not be highly focused at the same point.
This is called spherical aberration. More advanced computer
assisted optical designs are creating lenses with more spherical
elements. More spherical elements within a lens means a higher
risk of spherical aberration having a negative impact on optical
quality.
Wide-angle zoom lenses and wide-angle lenses with large apertures
are especially at risk for spherical aberration.
To eliminate spherical aberration, Tokina employs aspherical
all-glass elements in many of its optical designs to correct this
problem. The aspherical shaped surface of the lens element
focuses light rays entering both the centre and edge of the
element correctly at the film plane for an accurately focused
image. In addition to correcting spherical aberration, these
elements fully correct light quantity and distortion at the edge
of the image and provide excellent results when used in
combination with a floating element design.
Through a close collaboration with Hoya Corporation, the world's
largest optical glass manufacturer, Tokina has succeeded in
producing high quality precision moulded all glass elements with
a higher aspherical shape than any other lens manufacturer. This
technique is unparalleled in its technological sophistication and
precision.
F&R Aspherical
------------------
This lens, the AT-X 107 DX Fish Eye encompasses Tokina's F&R
aspherical moulded glass elements. These give higher performance
with very even illumination in the corners and correction of
spherical aberration across the image area.
SD Super Low Dispersion
-----------------------
When standard optical glass is used in telephoto lenses, a
phenomenon called chromatic aberration can occur. Chromatic
aberration is the inherent tendency for glass to disperse
(separate) a ray of light into the colours of the rainbow. The
rainbow effect created by a glass prism is the most dramatic
demonstration of chromatic aberration. In lenses, it is much less
pronounced, but still creates slightly out of focus colours, akin
to an "optical noise" that has a negative impact on the quality
of the picture. To eliminate chromatic aberration, Tokina employs
expensive, special glass material having super- low dispersion
(SD) properties.
Lenses in the Tokina line-up with the SD mark incorporate these
Super-Low Dispersion glass elements, minimizing the secondary
spectrum or optical noise caused by chromatic aberration.
HLD
---
Tokina's wide-angle and standard zoom lenses feature a higher
quality of optical glass known as Tokina HLD (High-refraction,
Low Dispersion) glass. Having higher refractive index and lower
dispersion properties, HLD glass is far less than standard
optical glass to create lateral chromatic aberration, which is
often a problem with conventionally designed wide-angle lenses.
Multi-Coating
-------------
Reflections off the surface of lens elements are the enemy to any
photographer and to every lens manufacturer. They are reduced or
eliminated by bonding multiple layers of a transparent
anti-reflection to the surface of the glass. Tokina has
developed and enhanced a better coating technique for its optics
so that they will maintain faithful colour reproduction and
render clean, sharp images.
Mechanical Technology
---------------------
Floating Element System
-----------------------
When designing a lens, Tokina calibrated its astigmatism at each
points between minimum focus distance and infinity so that it
will give the higher image results at each settings. However,
when there are large differences between the focus limits, effect
calibration is not possible. A floating element system
incorporates optical elements that move in proportion to the
focus setting of the lens. This allows astigmatism to be
corrected. Many Tokina lenses employ floating element systems to
provide optimum correction of astigmatism from minimum focus
distance to infinity.
Internal Focus System
---------------------
The two most used methods of focusing a lens are either the
complete straight forward movement of lens elements (used mainly
with single focal length lenses) or the rotation of the entire
lens barrel group (used mainly with zoom lenses). The internal
focusing system used by Tokina move each element group within the
lens, but does not change the overall length of the lens. This is
especially useful with telephoto designs.
The internal focusing system has a number of advantages
including;
* Faster focusing
* Improved handling due to fewer movements near the centre of
gravity
* More compact lens designs
Focus Clutch Mechanism
----------------------
Tokina AT-X PRO series lenses features the patented "Focus
Clutch" mechanism for sw the lens between auto focus and
manual focus modes.
The manual focusing ring can move (be snapped) back and forth
between an AF and MF position. When the focusing ring is forward
in the AF position, it is not engaged to any of the internal
focus gearing and will turn freely. Without the added weight of
the metal ring the camera can auto focus the lens more quickly
and smoothly.
For manual focus, simply rotate the focus ring all the way to one
side or the other on the focus travel, either infinity or it's
closest focusing distance, then pull back (towards the
plate) on the manual focus ring. While pulling back, rotate the
ring from one side of the focus travel to the other. When the
gears align, the focus ring will snap back into the MF position
and the lens can be focused manually.
To return the manual focus ring to auto focus mode, simply snap
the ring forward from any point.
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----------------
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