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1514
What's XR?
New Standard of Lenses
for Digital Cameras
Di (Digitally Integrated Design) is a designation Tamron
puts on lenses featuring optical systems designed to meet
the performance characteristics of digital SLR cameras
as well as film cameras.
Vibration Compensation
Mechanism
Camera vibration, or camera shake, is the term used to
describe the reason a photo comes out blurry when the
photographer moves just as he or she presses the shutter
release button. The resulting image usually looks fuzzy or
out of focus. Camera vibration is the primary cause of
poor image quality in hand-held photography.
Thanks to the proprietary actuator and algorithms Tamron
has built into this lens, the viewfinder always gives you
smooth, steady images. The reliable viewfinder image
ensures that you, the photographer, will not be distracted
from your most important task — using your camera for
maximum creative effect.
Tamron's proprietary Vibration Compensation mechanism
uses a three-coil system. Three driving coils move the VC
lens electromagnetically, based on signals originating
from the movement of three steel balls. The lens element
that compensates for vibration is held in place only by the
steel balls, so there is little friction and the movement is
quite smooth. With the element movable in a plane
parallel to the image via electronic control alone, a simple
mechanical design is realized. This ensures that the size
of the lens itself is remarkably compact.
What's Di ?
barrel (rear view) barrel (side view)
long barrel
(optics)
short barrel
(optics)
By reducing the total length of the
optical configuration, we succeeded
in developing optics that allow for a
smaller lens diameter while maintaining the same aperture
values as previous lenses for overall compactness. Optical
power distribution was enhanced in a compact package
through the innovative use of XR (Extra Refractive Index)
glass, resulting in minimum aberration.
Achieving the same aperture value with a smaller size
With a short barrel, it is possible to obtain the same visibility
(aperture value) as with a long barrel. By using this principle,
we were able to shorten the optic system length for a more
compact overall lens design while maintaining aperture values.
What's VC?
Advanced optical designs include XR,
LD, AD and Aspherical glass
XR (Extra Refractive Index) glass is effective in reducing the optical
length of the lens through high refractivity. LD (Low Dispersion)
and AD (Anomalous Dispersion) glasses minimize loss of
sharpness caused by color blurring at the tele end of the focal
range, while ensuring vivid, quality imaging. The Aspherical lens
technology compensates for spherical aberration to achieve
outstanding image quality. At the same time, reducing the number
of elements results in a more compact, lightweight lens package.
Model A20
VC actuator
Control
circuit
board
VC
microcomputer
Driving coil
and position detection sensor
VC Lens
(Compensation
Optical System)
Gyro sensor
for detecting yawing
Gyro sensor
for detecting
pitching
Steel balls
Magnet and yoke
Specifications
Model
A20 for Canon
Focal Length
28-300mm
Maximum Aperture
F/3.5-6.3
Angle of View
Diagonal: 75˚23'-8˚15' (52˚58'-5˚20')
Horizontal: 65˚28'-6˚52' (45˚0'-4˚26')
Vertical: 46˚15'-4˚21' (30˚34'-2˚35')
( )=
the figures when used on APS-C sized digital camera
Lens Construction
18 elements 13 groups
Minimum Focus Distance
0.49m (19.3”)
Max.Mag.Ratio
1:3 (at f=300mm, MFD:0.49m)
Overall Length
99mm (3.9")*
Maximum Diameter
ø78.1mm (3.1")
Filter Size
ø67mm
Weight
555g (19.6oz.)*
Diaphragm Blades
9
Minimum Aperture
F/22~F/40 (28mm~300mm)
Standard Accessory
Flower-shaped hood
Compatible Mount
Canon, Nikon
*Values given are for Nikon cameras.
The images in this leaflet are taken with prototype model.
The cosmetic design and specs are subject to change without notice.
*
When 28-300mm Di VC (model A20) for Canon is used in combinatio
with the following cameras, the Vibration Compensation Mechanism will
not function properly:
Digital SLR: EOS-1Ds (Mark II and Mark III ARE compatible)
Film SLR: EOS- Rebel T2 (300X, Kiss7), Rebel K2 (3000V, KissLite)
*
When 28-300mm Di VC (model A20) for Canon is used in combination
with some of the EOS Series (film camera), the VC function may not work
.
100QD, 10QD, 850, 750QD, 650, 620, 630 (630QD, 600)
*
AF motor is built in for NII models. Aperture ring is not equipped.
C
AF28-300mm
F
/
3.5-6.3
XR Di VC
LD Aspherical
[
IF
]
MACRO
Vibration Compensation-Blurr-Stopping Power
AF28-300mm F/3.5-6.3 XR Di VC – Different Angles of View
Taken with a full-size camera
Taken with an APS-C size digital camera
28mm 50mm 100mm 200mm 300mm
28mm
(
Equivalent to 43mm
)
50mm
(
Equivalent to 78mm
)
100mm
(
Equivalent to 155mm
)
200mm
(
Equivalent to 310mm
)
300mm
(
Equivalent to 465mm
)
28-300mm with VC