Olympus 1 Instructions Manual page 15

Making Intentional Over- or Under-
exposures
You can make intentional over- or
under-exposures to meet special light-
ing requirements (such as backlighting,
sidelighting, etc.) by using the central
index in the viewfinder as a guide.
When the needle swings towards the
(+) position, it indicates over-exposure.
When it swings towards ( – ) , it in-
dicates under-exposure. The exact F
stop-needle relationship is shown in the
above diagrams.
Caution in Low-light Exposure
Metering
The meter's exposure range is EV2—17
(ASA 100 with F1.4.) The combina-
tions listed below indicate the lowest
measurable limit in dealing with dark
subjects.
Below this limit or with the meter
switch at OFF, when the aperture ring
or shutter speed ring is rotated, the
needle might sometimes swing but the
meter will not work.
Lens F/Stop
Fully open
50mm F1.8
50mm F1.4 Fully open
Fully open
55mm F1.2
Stop-down Exposure Readings
When using the OM-1 in conjunction
with the extension tubes, bellows or
the Zuiko Shift Lens it is necessary to
take meter readings with the lens stop-
ped down. After setting the desired
aperture on the aperture ring, stop
the lens diaphragm down and look
through the viewfinder.
shutter speed ring until the needle
aligns within the center of the index.
(See the instructions on Preselecting
the F Stop, page 13.)
Special Exposure Techniques
1) Backlighting and Sidelighting
When the most important area of the
picture is much darker than the general
picture area (strong light hitting the
main subject from behind or from the
side) the meter will have a tendency to
14
read the brightest part of the picture
leaving the main subject under-exposed.
To compensate
towards the subject until most of the
subject image appears in the viewfinder
and take your meter reading. After
Shutter Speed
setting the exposure, return to your
1/2 sec
original position to take the picture. If
1/2 sec
this procedure cannot be followed, you
1/2 sec
can obtain approximately the same
results by simply opening your lens
one full
meter reading.
lighting or sidelighting, it's always a
good idea to use a lens hood to
eliminate unwanted glare.)
2) Strong
Shadows
Rotate the When taking a picture of a bright
subject against a dark background
(spotlights, deep shadow areas, etc.)
the meter has a tendency to read the
darkest part of the picture leaving the
main subject over-exposed. To com-
pensate for this use the same procedure
for setting exposure as outlined for
backlighting. You can also approxi-
mate the proper exposure by holding
your position and closing the lens
down one full F stop from the indi-
cated meter reading.
for this, move
F stop over the indicated
(NOTE: With back-
Frontlighting and Deep
in