INFRARED INDEX (Fig. 4)
Special focus adjustment is required when using infrared black and white film with an
infrared filter attached to the lens. Set the lens and the camera in manual focus mode and
focus normally. Then adjust the focusing scale to the infrared index and attach the infrared
filter to begin photographing. A critical focus may be obtained through test shooting(s).
LENS HOOD
A lens hood is built in as a part of this lens. In order to eliminate unnecessary and harmful
stray light rays from outside the ultra-wide angle of view of the lens, the lens hood is built in
as an inseparable part of the lens barrel. This built-in lens hood design also protects the
front convex lens element, which has an extremely large curvature.
CHECKING DEPTH OF FIELD (Refer to depth-of-field table)
The depth-of-field table shows aperture values horizontally at top and ranges of focus verti-
cally at left. If, for example, the aperture is set at f/4 and the distance to the subject is 1 m
(3.3ft), the depth-of-focus value is 0.67 - 2.24m (2.2 - 7.39 ft.)as read in the table where f/4 in
the horizontal column and 1m (3.3ft) in the vertical column intersect.
* Refer to the instruction manual of your camera for additional information.
* If your camera has a depth-of-field preview mechanism, the depth-of-field effect can
be confirmed in the viewfinder. For further details on the preview mechanism, refer to the
instruction manual of your camera.
FILTER (Fig. 6)
Due to the nature of this lens's ultra-wide angle of view, a filter cannot be attached to the
front of the lens barrel. A sheet type of filter, such as a gelatin filter, may be cut using the
template provided and inserted in the filter slot in the rear of the lens.
* Cut and trim a sheet-type filter to the size of the template. If the template is not followed
exactly, the filter may bend or, in some cases, snap out of position by the focusing move-
ment of the lens and therefore may not work effectively.
* Set the lens to the infinity position in order to insert or extract a filter from the filter slot of
the lens.
