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EXPOSURE INDICATORS
The appearance of the YELLOW arrow signifies too little light for hand-held
photography, since the exposure speed will be slower than 1/30 second. Turn
the Aperture Ring in the direction of the arrow until it disappears. If it fails to
disappear, use a tripod. (Yashica convertible Grip/Tripod ST-7 is handy to lean
up against a wall or post for support ). Whether the YELLOW arrow disappears
or not, the precise exposure speed will be determined and set automatically to
a maximum of 30 seconds.
CONTROL OF SHUTTER SPEED
The Electro Exposure control system is of the Aperture Priority type. You select the
lens opening and it sets the shutter speed for the correct exposure. This normally
works out very well
You can however overcome this and control the shutter speed, for sporting events
for example.
When you understand the relationship between the aperture stops and the
percentage of light between them, it actually becomes quite simple to select the
shutter speed best suited for your shots.
Each ƒ stop on the lens barrel, namely, 16 -11 -8 -5.6 -4 -2.8 -2 -1.4
represents a 100% change from the adjoining setting. As the numbers get larger,
the amount of light transmitted by the lens becomes LESS, because this number is
NOT the size of the lens opening but is the ratio of the sizeof the lens opening
[aperture] to the focal length of the lens. With this in mind, it is not difficult to follow
the procedure.
In daylight photography, set the lens opening to maximum for the sake of
simplicity. This is 1.7 on the 'G' series. Now slowlypress the shutter release button
until you see the red over exposure lamp. Then adjust the lens opening until both
the red and yellow lamps are out. At this point your camera is set for the correct
exposure with the shutter set at 1/500th sec. If you wishto cut the shutter speed in
half to 1/250th second for the sake of greater depth of focus, move the indicated
lens opening on the barrel to the next 100% smaller aperture setting. For example
if the lamp went out at ƒ 5.6, decrease the lens opening by 100% to ƒ 8.0
Obviously you can move from one mid point to the next. To obtain an exposure of
1/125th second, you would move the lens by two increments to ƒ11. Try this
without film in the camera to get the hang of it.