Specifications

To render the background in sharp focus or for snapshots and candid photos where there isn't time for pin-point focus,
stop the lens down to a small aperture, so the greater depth-of-field will give you greater overall focus for the picture
area. To stand out your subject against its surroundings, open the lens up to a larger aperture, so the shallow depth-of-
field will throw the back-ground out of focus.
The depth-of-field range can be determined using the depth-of-field scale for the lens in use. First, select the desired
aperture, then look at the corresponding figures on the depth-of-field scale on both sides of the central index dot. This
is the extent of the depth-of-field that will be obtained with the aperture you are using. For example, if the camera is
focused at 15ft (5m) at an aperture of f/11, the range of sharp focus will be approximately from 10ft (3m) to Soft
(10m).
Infrared Photography
The red dot (or red line) to the right of the central index dot of the lens is the infrared mark. This mark is provided
because focusing characteristics of the lens differ from ordinary films when using black and white infrared film.
Compensation is required as explained below.
1. After focusing the lens in the normal manner, read the distance indicated by the central index dot. Then, move the
distance indicated so that it aligns with the infrared mark.