Size:Nikon Tokina Lens AT-XM100PRO D (Nikon Fit) The AT-X 100 PRO D is a macro
lens capable of life-sized (1:1) reproduction at 11.8 inches (30 cm). The lens
multi-coating has been re-engineered to match the highly reflective silicon
based CCD and CMOS sensors in today’s digital SLR cameras. This lens gives the
higher of both worlds because optics still give full coverage and excellent
sharpness on 35mm film. A macro lens that can handle both the digital and film
worlds with ease. Specifications: Zoom range: 100 mm Maximum aperture: F/2.8
Minimum aperture: F/32 Optical construction: Nine elements in eight Groups
Angle of view: 24 degrees 30′ Minimum focus distance: 11.8″ (30 cm) Macro
ratio: 1:1 Focus limiter: 1.28 to infinity Number of diaphragm blades: 9
Filter size: 55 mm Width: 73 mm Height: 95.1 mm Weight: 19 oz (540 g)
Dedicated lens hood included Focus Limiter Switch The AT-X 100 PRO D also has
a very convenient focus limiter switch that can lock the focus making it
faster to focus when used as a moderate telephoto lens that is excellent
portraits as well. Tokina One Touch Focus Clutch Tokina One Touch Focus Clutch
mechanism for fast easy switching between manual and auto focus. Non-Rotating
Filter 55 mm non-rotating filter thread for use with macro ring flashes and
special effects filters. 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 enhanced computer assisted
optical designs are creating lenses with more spherical elements. More
spherical elements within a lens means a greater 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 greater aspherical
shape than any other lens manufacturer. This technique is unparalleled in its
technological sophistication and precision. F&R Aspherical This lens, the AT-
XM100 PRO D encompasses Tokina’s new F&R aspherical moulded glass elements.
These give outstanding 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
colors 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 colors, 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, minimising 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 likely 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 chemical to the surface of the glass. Tokina has developed and
enhanced a coating technique for all of its optics so that they will maintain
faithful color reproduction and render clean, sharp images. Mechanical
Technology Floating Element System When designing a lens, Tokina calibrated
its astigmatism at all points between minimum focus distance and infinity so
that it will give the best image results at all 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 Superior use of filters because the barrel with the
filter thread does not rotate. Focus Clutch Mechanism Tokina AT-X PRO series
lenses all feature the patented “Focus Clutch” mechanism for switching 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 mount 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.
- Macro lens capable of life-sized (1:1) reproduction
- Closest macro focusing distance 11.8 inches (30 mm)
- Suitable for DX and full frame DSLRs
- One Touch Focus Clutch Mechanism
- Includes 55 mm non-rotating filter thread
- Product Dimensions: 2.9 x 2.9 x 3.7 inches
- Item Weight: 1.26 pounds
- Shipping Weight: 1.74 pounds
- Item model number: T01-D100MN
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