b. Load the easel with the object to be copied, (para 1-22).
c. Install the 4x5-inch or the 8x10-inch focusing back to accommodate the
required film holders (4x5-inch or 8x10-inch).
1-24. ADJUSTING SIZE AND FOCUSING. The camera set will produce copies the same
size as the original, enlargements of the original, or reductions of the
The following procedure may be used to obtain the required size:
a. Remove the lens cap from the front of the lens.
b. Set the aperture lever to f/6.3. This setting will admit the maximum
amount of light and produce the minimum depth of field for sharp focusing.
c. Press down on the press focus lever.
The shutter will open, and
remain open, to permit focusing.
d. Move all four locking handles on the carriages backward to release the
e. Rotate the front handwheel (clockwise or counter-clockwise, as
required) until the image on the ground focusing glass is approximately the
NOTE: The size of the image can be estimated by using the lines on the
ground focusing glass as a guide. The distance between the lines on the
8x10-inch focusing back is inch. The distance between the lines on the
4x5-inch focusing back is X inch.
The image dimensions can range from
one-quarter to four times the dimensions of the object being copied.
Moving the lens toward the object increases image size, while moving the
Maximum reduction is
obtained with an object-to-lens distance of approximately 60 inches.
counterclockwise, as required) until the image on the ground focusing glass is
Rotate the back focusing handle until the image is sharply