AF18-250mm F/3.5-6.3 Di
(Model A18)
AF18-270mm F/3.5-6.3 Di VC
(Model B003)
AF55-200mm F/4-5.6 Di
(Model A15)
SP AF10-24mm F/3.5-4.5 Di
(Model B001)
SP AF17-50mm F/2.8 XR Di
(Model A16)
AF18-200mm F/3.5-6.3 XR Di
(Model A14)
SP AF28-75mm F/2.8 XR Di
(Model A09)
AF28-200mm F/3.8-5.6 XR Di
(Model A031)
AF28-300mm F/3.5-6.3 XR Di VC
(Model A20)
AF28-300mm F/3.5-6.3 XR Di
(Model A061)
SP AF70-200mm F/2.8 Di
(Model A001)
AF70-300mm F/4-5.6 Di Macro 1:2
(Model A17)
SP AF200-500mm F/5-6.3 Di
(Model A08)
SP AF90mm F/2.8 Di Macro 1:1
(Model 272E)
SP AF180mm F/3.5 Di Macro 1:1
(Model B01)
Di
Di
Di
What does “Di II” mean?
Designed to capture the optimum scope when used with a APS-C digital camera
Full-size
format
Digital SLR with APS-C size imager
Images t aken with
a digital SLR with an
APS-C size imager are
actually cropped to
about 70 % scope.
Since the size of full-size format is
different from the APS-C size ima-
ger, scopes captured are different
even when focal lengths are the
same (i.e., angles of view differ). The
AF18-270mm Di-II is designed to
have shorter focal lengths to achieve
optimum angles of view in its wide-
angle side.
Angle of view
75˚23'
Angle of view
52˚58'
Principal
ray
Full-size format
43.27mm
24mm
36mm
Same
Focal Length
28mm
Focal
Point
image
sensor
APS-C size
imager
27.9mm
about
15.5mm
about
23.2mm
*
The general image sensors
( s m a l l e r - s i z e i m a g e r s )
are about 24mm x 16mm.
However, the dimensions and
effective size differ depen-
ding upon manufacturers.
Principal ray
Lights
Focal
Point
Focal Length
Mirror
Film/
Image Sensor
Camera
Designed to fi t APS-C size imagers in order to reduce its diameter
Attempts to design shorter focal lengths inevitably result in a larger lens di-
ameter. Tamron has solved this problem by designing the size of the lens’
image circle to match that of APS-C size imagers. In the compact design,
it is almost comparable to a lens offering the same angles of view in full-
size format.
*When pictures are taken with a Di-II lens on a full-size format, image cor-
ners become dark (ie., vignetting becomes noticeable).
Image circle
for Di-II lenses
Vignetting when used
with a full-size format
camera
APS-C size
imager
full-size format
Full-size format and APS-C size imager
–Angles of View and Focal Lengths
Full-size format:
419mm
=
APS-C size imager:
270mm
*APS-C size imager = Digital cameras
with smaller-size imagers, about 15.5mm x
23.2mm.
Full-size format:
78mm
APS-C size imager:
50mm
=
Full-size format:
28mm
APS-C size imager:
18mm
=
Telephoto
5˚55'
Standard
31˚11'
Wide
75˚33'
Diagonal
75˚33'
Horizontal
65˚36'
18mm
Equivalent
28 mm
Diagonal
31˚11'
Horizontal
26˚7'
50mm
Equivalent
78mm
Diagonal
15˚53'
Horizontal
13˚14'
100mm
Equivalent
155mm
Diagonal
5˚55'
Horizontal
4˚55'
270mm
Equivalent
419mm
Differ
ent Angles of V
iew
*Full-size format = 24mm x 36mm
200mm
Equivalent
310mm
Diagonal
7˚59'
Horizontal
6˚38'
Categories of Tamron's Di lens series
NOTE: Vignetting occurs when pictures are taken with a Di-II lens mounted on a full-size format SLRs camera
or a digital SLRs with a image sensor larger than 24 x 16mm.
Designed exclusively for digital cameras with APS-C size imagers.
Di-II lenses are designed exclusively for digital SLRs with APS-C size imagers. This series of lenses are not
designed for 35mm fi lm cameras and digital SLR cameras with image sensors larger than 24 x 16mm.
Lens Series
Lens Series
NOTE: The angles of view obtained by a “Di” lens mounted on a digital camera with smaller-size imagers dif-
fer from those obtained by the same lens mounted on a full-size format SLRs.
Digitally integrated design.
Di lenses are designed to fi t the characteristics of digital cameras as well as fi lm cameras by paying attention to
countermeasures against ghosting and fl are through such advances as special coatings.
Head Office
Caution:
Please read the instruction manual carefully before using the lens.
Manufacturer of precise and sophisticated optical products
for a broad range of industries.
Quality Assurance Activities:
At Tamron, quality management activities are performed
in compliance with ISO9001:2000 not only to assure product quality but to enhance
customer satisfaction
.
Environmental Protection:
We recognize the signifi cance of our social responsibilities.
Tamron promotes corporate activities that protect the earth‘s environment through the
establishment of a quality assurance system that is compliant with ISO 14001.
TAMRON Europe GmbH
www.tamroneurope.com
Robert-Bosch-Str. 9, 50769 Köln, Germany, Tel. +49 (0)221 970325-0, Fax +49 (0)221 970325-4
09.2008
18-270mm_E.indd Abs1:2
18-270mm_E.indd Abs1:2
16.09.2008 14:29:04 Uhr
16.09.2008 14:29:04 Uhr
