Instruction manual

14. DISTANCE SCALE AND DEPTH OF FIELD SCALE

A. Distance scales on the Bronica lenses for the ETR can be used for

setting the focus on the required distance or finding the distance actually

focused. Simply rotate the focusing ring and set the required distance

opposite the green colored index, which will adjust the lens for the

required distance.

B. There is an apparent zone of sharpness, both in front and back of the

focused subject, which is known as the depth of field. The depth of field

scale shows the zone of apparent sharpness at any lens opening or

distance and can be utilized for quickly and simply ascertaining the

depth of field. The depth of field scale is next to the distance scales and

is made up of identical pairs of apertures on both sides of the green

colored distance index. These identical pairs of apertures indicate the

distance that will be in focus at these lens openings. For example, if the

75mm lens is focused at a distance of 1.5m, it can be seen from the

depth of field scale that the zone will extend from about 1.2 to 2.1

meters (4 ft. to 7 ft.), when a lens opening of F22 is used.

15. INFRARED PHOTOGRAPHY

In infrared photography, some adjustment must be made in the focus in

order to retain sharpness on the film because the invisible infrared Pays

are longer in wave length than the visible rays used for focusing. For

infrared photography--

1. Use a R filter or equivalent with an infrared (black-and white) film.

2. The red-colored line, next to the green-colored distance index, is the

infrared index.

3. After focusing in the normal manner, re-set the distance indicated by

the green-colored distance index to the infrared index, by shifting the

distance ring.