Canon F1 Instruction Manual

							20 METER COUPLING RANGE
20 Meter Coupling Range
With an FD 50mm f/1.4 lens and ISO 100/21 
(ASA 100/21 DIN) lm, the New
Canon F-1s built-in exposure meter couples within a range of EV.- 1 (4 sec. at
f/1.4) to EV 20 (1/2000 sec. at f/22). In aperture-priority AE or stoppeddown AE,
the coupling range is EV-1 to EV 19 (1/1000 sec. at f/22).
EV (Exposure Value) is a numerical value of exposure which is based on proper
combinations of shutter speed and aperture. The cameras EV coupling range varies
with lens speed and ISO lm sensitivity. 41 
						

							21 METERING SENSITIVITY AREAS
21 Metering Sensitivity Areas
With the New Canon F-1, a special optical element in each focusing screen de-
termines the metering sensitivity area. Thus the metering area can be changed,
according to the sub ect you are shooting and the lens in use, simply by replacing
the focusing screen.
There are three dierent light measuring areau available, each designed to suit par-
ticular metering requirements. 1. Center-weighted Average Metering
With this system, the meter reads the entire viewing area with special emphasis on
the central portion where the sub ject is most likely to be. It can be used for general
photography, and is recommended especially for AE photography. 2. Selective-area Metering
The selective-area system, with its 12% coverage, allows you to meter a certain
portion of a scene. It, too, is suited for all-around use, and is particularly eective
for metering highcontrast scenes, such as landscapes with a bright sky and backlit
sub jects. Manual exposure is recommended for optimum results. This system can
be used for AE photography, but special attention must be paid to ensure that the
sub ject is within the 12% metering area. 42 
						

							21 METERING SENSITIVITY AREAS
3. Spot Metering
Spot metering is ideal for sub jects which require carefully-aimed, precise measure-
ment. Since the metering area is 3% of the eld of view, you can select a small,
exact area from the overall scene. It is especially advantageous for metering inac-
cessible sub jects and when shooting with a telephoto lens. Also very eective for
stage and close-up photography. This system is not suitable for AE photography;
for best results, use manual exposure metering. Since the optical element is located in close proximity to the focal plane, this new
system of metering sensitivity distribution ensures extremely accurate results. The
actual measuring area, which is slightly shaded, can be seen in the center of the
viewnder with selective-area and spot metering. It is not visible, however, with
center-weighted average metering. 43 
						

							21 METERING SENSITIVITY AREAS
44 
						

							22 EXPOSURE COMPENSATION
22 Exposure Compensation
With center-weighted average metering, the cameras meter reads the average bright-
ness of the sub jects in a scene, with special emphasis placed on those in the center.
Certa n lighting conditions, however, may necessitate exposure correction. If there
is bright light, such as the sun or a window, behind the sub ject, the meter may be
in
uenced by that light and your sub ject will be underexposed. On the other hand,
if you are shooting an actor on a dimly-lit stage, the meter may be fooled and
your sub ject will be overexposed. Thus it is preferable, whenever possible, to meter
the part of the scene which requires the most accurate exposure. This is particularly
true if the scene has strong contrasts in brightness.
Selective-area metering is less in
uenced by the surrounding lighting conditions
provided the main sub ject covers most of the 12% metering area. However, if the
sub ject is quite small, some exposure compensation may still be necessary.
Since spot metering allows you to select a small, exact area, it is virtually unaected
provided the sub ject lls the 3% center spot.
Exposure compensation may also be necessary if you wish to intentionally overex-
pose or underexpose the shot for creative eect.
You can compensate exposure in any one of the following ways:  Manual Exposure
 Exposure Compensation Dial
 Adjust the ISO Setting
45 
						

							22 EXPOSURE COMPENSATION
1. Manual Exposure
After setting the desired shutter speed, turn the aperture ring until the aperture
needle aligns with the meter needle. You can now over- or underexpose the sub ject in
one-half f/stop increments simply by turning the aperture ring to a larger or smaller
aperture. Note that the diameter of the aperture needles circle is equivalent to one
f/stop. This method of exposure correction is useful, for example, when shooting a
sub ject with strong backlight. 46 
						

							22 EXPOSURE COMPENSATION
2. Exposure Compensation Dial
The exposure compensation dial allows you to make exposure corrections in incre-
ments as small as 1/3 f/stop. To ma1te a correction, simply turn the dial, while
pressing the lock release button, until the desired correction aligns with the index. 47 
						

							22 EXPOSURE COMPENSATION
The whole numbers are for increasing exposure while the fractions are for reducing
exposure. The numbers 2 and 1/2 are equivalent to one f/stop (or one step of
the shutter dial), while 4 and 1/4 are equivalent to two f/stops (or two steps of
the shutter dial). The intermediate settings indicate increments of 1/3 f/stop. The
table above shows which settings can be used depending on the ISO lm speed.
This means of exposure compensation is possible regardless of the exposure mode,
and is useful for bracketing. It is particularly advantageous for AE photography
since it allows you to adjust the exposure quickly.
IMPORTANT Once you have made an exposure correction, dc. not forget to
reset the dial to 1. Otherwise, all following frames will be incorrectly exposed. 3. Adjusting the ISO Rating
You can also correct exposure in manual or AE by changing the lm speed setting
on the camera.
A lm with an ISO rating twice that of another lm requires only half the amount
of light for correct exposure. Thus if you have an ISO 100 lm loaded and you wish
to underexpose the sub ject one f/stop, simply change the ISO setting to ISO 200.
It is possible to over- or underexpose the sub ject by up to two f/stops using any of
these three methods. For compensating more than two f/stops, make the adjust-
ment by changing the ISO rating or by manually setting the aperture and shutter
speed. 48 
						

							22 EXPOSURE COMPENSATION
Note
When it is dicult to determine exactly how much correction to make, bracket the
exposure. using any of the three methods.
4. Pushing the ISO Rating
There may be occasions when, due to insucient lighting, you are forced to use
undesirably slow shutter speeds. In this case, you can push the ISO setting on
the camera to a higher value. Usually this is done by multiplying the normal ISO
lm speed by a multiple of two, such as two or four. The entire roll of lm must
be shot at the pushed ISO setting; otherwise, exposure will not be correct for all
frames. It is also necessary to inform the developing lab of the change in the ISO
rating or the lm will be incorrectly developed. Hbwever, since not all lms can be
pushed with acceptable results, it is recommended to read the lm data sheet or
other photographic literature before you try this technique. 49 
						

							23 REWINDING THE FILM
23 Rewinding the Film
When you have reached the end of the lm, the lm advance lever will stop before
the end of its stroke. 1. Turn the rewind lever in the direction of the arrow and push it down until it
locks. 2. Unfold the rewind crank and turn it in the direction of the arrow. You will
hear a sound as you turn the rewind crank which indicates the lm is being
rewoun t When you no longer hear the sound, the lm is completely rewound. 3. Pressing the safety stopper, open the camera back by pulling up the rewind
knob and take out the lm. Be sure to shield the lm from direct sunlight
while unloading. 50