5.
What is the focal length of the lens and the maximum f/stop?
ANS: __________________________, _________________________
_______________
6.
There are __________ automatically timed speed settings plus ( ) and
( ) settings and __________ aperture settings.
(fillin blanks)
_______________
7.
What is the wattage of the incandescent lamps used with the light
assemblies?
ANS: _______________________
15
a. Ground focusing glass. The 4" x 5" focusing back and the 8" x 10"
focusing back (para 11c) are provided with a 4" x 5" ground focusing glass
and an 8" x 10" ground focusing glass, respectively. When either of the
focusing backs is installed on the camera, the ground focusing glass is
positioned in the focal plane to permit focusing the image from the lens and
to define the picture area.
b. Filmholders. Six 4" x 5" filmholders and six 8" x 10" filmholders
are furnished with the camera set. During operation, a loaded filmholder is
inserted in the focusing back. The film is positioned in the film plane to
second the image after it has been sharply focused on the ground focusing
glass (a above).
c. Filter holder. The filter holder positions standard 4" x 5"
photographic filters in front of the camera lens. The filter is used when
it is necessary to alter the film spectral response.
d. Opal glass. The opal glass provides even illumination when
transparencies or other materials that are illuminated from the rear, are
being copied.
e. Camel's hair brush. The camel's hair brush is used for removing
dust from the glass parts of the camera set. The brush is contained within
its own metal case.
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