Tamron AF 75 - 300MM F/4 - 5.6 LD MACRO 1:3.9 672D - Manual (Page 6)

APERTURE CONTROL & AE SETTING
Canon / Minolta
Your camera controls the aperture depending on the shooting mode in use. Although
the aperture value varies in accordance with zooming, the camera itself reads out the
change to provide automatic compensation.
Nikon / Pentax
When shooting in programmed AE or shutter-priority AE mode, rotate the aperture
ring to the minimum position. For aperture-priority or manual mode, turn the aperture
ring to the desired setting. In case of F401/F50 series models, the aperture is set by
the camera in accordance with the given camera instructions.
LENS HOOD
A bayonet-type lens hood is provided as a standard accessory. Tamron recommends
shooting with the hood attached whenever possible as the lens hood cuts out light,
which is harmful to image quality. However, please be aware of the precautions noted
below when your camera is equipped with a built-in flash. When the hood is not in
use, it can be placed on the front of the lens in reverse:
Attaching the Lens Hood Align the index mark on the hood with the correspon-
ding index mark on the lens. Push the hood onto the lens and then rotate it clockwise
to secure. When attaching the lens hood, hold the focusing and zoom control rings so
that they are not rotated unintentionally.
TRIPOD SOCKET (Ref. Figs. 9 & 10)
To change the camera from horizontal to vertical position or vice versa, loosen
the locking knob for the tripod-attaching base by rotating it counterclockwise, then
rotate lens and the camera about the longitudinal axis of the lens. Tighten the locking
knob by rotating it in clockwise direction until it stops. (Fig. 9)
To remove the tripod-attaching base, loosen the locking knob, pull it back
slightly, and then lift the knob to open the tripod base ring as illustrated in Fig. 10.
When removing the tripod-attaching base, hold the lens and the camera securely to
prevent them from both accidentally falling.