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PRECAUTIONS IN SHOOTING
The optical design for Di II takes into consideration the various features of digital single reex
cameras. However, due to the conguration of the digital single reex cameras, even when the
autofocus accuracy is within specications, the focal point may be a little forward or behind the
optimum point when shooting with autofocus under some conditions.
The image circles of Di II lenses are designed to match the digital SLR cameras using the image
sensors equivalent to APS-C (approx. 15.5
23.2mm). Do not use Di II lenses with cameras using
image sensors larger than APS-C. Using Di II lenses with such cameras may cause vignetting on
the image.
The Tamron lenses described here employ an internal focusing (IF) system. Because of the
characteristics of this optical design, the angles of view at distances other than innity are wider
than that of the lenses applying an ordinary focusing system.
When the built-in ash on the camera is used, adverse photographic phenomena such as corner
illumination fall-off or vignetting at the bottom part of the image may be observed, especially in
wide angle ranges. This is due to the inherent limitation of the coverage of the built-in ash,
and/or the relative position of the ash to the edge of the lens barrel which causes shadows on
the image. It is strongly recommended to use a suitable separate ash unit provided by the
camera manufacturer for all ash photography.
For further details, please read the “built-in ash” article on the instruction manual of your
camera.
Certain camera models may indicate the maximum and minimum aperture values of the lens in
approximate numbers. This is inherent to the design of the camera and not an indication of an
error.
When using a special lter such as a PL lter, use low prole lters. The thick rim of a normal
lter may cause vignetting.
TO ENSURE LONG-TERM SATISFACTION
Avoid touching the glass element surface. Use a photographic lens cloth or blower to remove
dust from the lens element surface. When not using the lens, always place a lens cap on it for
protection.
Use a lens cleaning tissue or lint cloth with a drop of cleaning solution to remove ngerprints or
dirt on the glass lens surface with a rotary motion from the center to the edge.
Use a silicon cloth to clean your lens barrel only.
Mildew is an enemy of your lens. Clean the lens after shooting near water or in any humid place.
Store your lens in a clean, cool and dry place. When storing the lens in an lens case, store it with
commercially available drying agent such as silicagel, and change the agent occasionally. If you
nd mildew on your lens, consult an authorized repair shop or nearby photographic store.
Do not touch the lens-camera interface contacts since dust, dirt and/or stains may cause a
contact failure between the lens and camera.
When using your equipment [camera(s) and lens(es)] in an environment where the temperature
changes from one extreme to the other, make sure to put your equipment temporarily in a case
or a plastic bag for a length of time in order for the equipment to go through a gradual
temperature shift. This will reduce potential equipment trouble.
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