User manual TAMRON AF18-270MM
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Manual abstract: user guide TAMRON AF18-270MM
Detailed instructions for use are in the User's Guide.
[. . . ] AF18-270mm F/3. 5-6. 3 Di
LD Aspherical [IF] MACRO
[Equivalent to 28- 419mm*]
* When converted to full-size format.
VC
new
The Ultimate All-In-One Zoom: Longest, Steadiest Lens On Earth
Di
* In the category of photographic lenses designed exclusively for digital SLR cameras with smaller-size image; researched by Tamron, Aug. [. . . ] The VC mechanism exhibits its camera-shake compensation performance to the maximum extent at dusk, in dimly-lit indoor situations, or in hand-held shooting at the ultra-telephoto settings. VC (Vibration Compensation) Unit Structure
VC actuator Steel balls Magnet and yoke Gyro sensor for detecting pitching Control circuit board
Vibration Compensation mechanism
OFF ON
Driving coil and position detection sensor VC Lens (Compensation Optical System)
VC microcomputer Gyro sensor for detecting yawing
Focal Length
270mm (Equivalent to 419mm) Exposure F/29 1/50sec.
Di
Full-size format
What does "Di II" mean?
Digital SLR with APS-C size imager
Designed to capture the optimum scope when used with a APS-C digital camera
Since the size of full-size format is different from the APS-C size imager, 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 wideangle side.
Camera Principal ray
Full-size format and APS-C size imager Angles of View and Focal Lengths
Telephoto
Images taken with a digital SLR with an APS-C size imager are actually cropped to about 70 % scope.
5°55'
75°23'
Same Focal Length 28mm Focal Point
image sensor
Full-size format
Full-size format: 419mm
=
Principal ray
Angle of view Angle of view
APS-C size imager: 270mm
52°58'
Standard
Focal Length
Lights
31°11' APS-C size imager: 50mm Full-size format: 78mm
43. 27mm
(smaller-size imagers) are about 24mm x 16mm. However, the dimensions and effective size differ depending upon manufacturers.
27. 9mm
Focal Point
about
Film/ Image Sensor
36mm
23. 2mm
Designed to fit APS-C size imagers in order to reduce its diameter
Attempts to design shorter focal lengths inevitably result in a larger lens diameter. 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 fullsize format. *When pictures are taken with a Di-II lens on a full-size format, image corners become dark (ie. , vignetting becomes noticeable).
Image circle for Di-II lenses Vignetting when used with a full-size format camera
=
*The general image sensors
24mm
APS-C size imager
Mirror
APS-C size imager
full-size format
Full-size format: 28mm
*APS-C size imager = Digital cameras with smaller-size imagers, about 15. 5mm x 23. 2mm. *Full-size format = 24mm x 36mm
Different Angles of View
Diagonal 75°33'
Horizontal 65°36' Equivalent
Diagonal 31°11'
Horizontal 26°7' Equivalent
Diagonal 15°53'
Horizontal 13°14' Equivalent
Diagonal 7°59'
=
about 15. 5mm
Wide
75°33' APS-C size imager: 18mm
Horizontal 6°38' Equivalent
Diagonal 5°55'
Horizontal 4°55' Equivalent
18mm
28mm
50mm
78mm
100mm
155mm
200mm
310mm
270mm
419mm
Categories of Tamron's Di lens series
Di
Lens Series
Designed exclusively for digital cameras with APS-C size imagers.
Di-II lenses are designed exclusively for digital SLRs with APS-C size imagers. [. . . ] Tamron promotes corporate activities that protect the earth`s environment through the establishment of a quality assurance system that is compliant with ISO 14001.
Head Office
TAMRON Europe GmbH
www. tamroneurope. com
09. 2008
Robert-Bosch-Str. [. . . ]
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