MORE ABOUT
THE CAMERA
To be able to take more interesting pictures
you need to know more about the controls on the
camera. Here are brief details.
The lens
This has a focal length (distance from lens to
film) of 45 mm. It has to be rotated (i.e. focused)
and set to agree with the subject to camera
distance. It is set in a rotating mount (13) marked
with figures which are the subject to camera
distances in feet. When taking close-ups (see
page 22) you must measure the distance but the
distance of subjects farther away can be estimated.
The Shutter
This is a Prontor 125 with three speeds, and
a " B " setting which is for time exposures.
The 30, 60, 125, represent fractions of a second
e.g. 60 is 1/60 second. The shutter is
synchronised for flash photography. Flashbulbs
and electronic flash can be used, see page 22.
2Q
The diaphragm
or lens aperture
The main purpose of the diaphragm ring is to
control the intensity of the light reaching the film
by altering the size of the lens aperture.
Another function of the aperture is to
control the range of distances within which a
subject can move and still be sharply denned on
the film. If the distance ring is set to 14 feet and
the diaphragm ring to "16", then by referring
to the "depth of field" scale (12) you can see that
objects in the picture will be sharp from about
7 feet to the far distance. ( is the sign for
infinity or far distance). You can check the depth
of field for any other combination of distance
and lens aperture by referring to the scale.
I L L U S T R A T I O N O F " D E P T H O F F I E L D "
Lens apertures are often
shown with the symbol
"f/" in front but this has
been omitted from the
Sportsman 125 camera to
make the numbers more
easily readable.
A is distance setting.
B to C is depth of field
when using f/16,
i.e. about 7 ft. to infinity.
