Canon A-1 Instructions Manual page 99

Not For Resale – Free Download at http://www.joe-chan.com/manuals
AE Mechanism: Electronically controlled.
Information input by means of AE mode
selector and AT dial for full-aperture AE
metering (FD lens at "A") and stopped-
down AE metering.
Employs three LSI's with I
LSI and one Bi-MOS IC for light
metering.
AE Mode Selection: By means of AE mode
selector. Two settings: TV (Time value)
for shutter priority AE, Av (Aperture
value) for aperture priority AE.
Light Metering System: Through-the-lens
Central Emphasis Averaging metering by
silicon photocell located just above eye-
piece lens. Light reaches silicon photocell
after passing through fresnel lens con-
denser.
ASA Film Speed Setting: ASA6 to ASA
12800 in 1/3 step increments. With lock.
Meter Coupling Range: EV-2 (8 sec. at
f/1.4) to EV 18 (1/1000 sec. at f/16) at
ASA 100 with FD 50mm f/1.4 lens.
Exposure Compensation: ±2 f/stop range in
1/3 f/stop increments: 1/4 •• 1/2 •• 1 ••
2 •• 4.
Exposure Memory: EV locked in when ex-
posure memory switch is pressed. When
pressed, the shutter-speed/aperture com-
bination can be changed for the same
locked-in EV.
Exposure Preview: Viewfinder digital read-
2
L, one Linear Stop-down Lever: Foldable. Stopping-
Manual Override: Possible by disengaging
Shutter: Cloth focal plane shutter with
Shutter Speed Scale: B, 30, 15, 8, 4, 2, 1,
Aperture Scale: • 1.4 • 2 • 2.8 • 4 • 5.6 • 8 •
Shutter Release Button: Oversized, two-
–98–
out activated by pressing shutter button
halfway or by pressing exposure preview
switch or exposure memory switch.
down an FD lens is possible only when
aperture ring is disengaged from "A"
mark.
FD lens from "A" mark and setting AE
mode selector to Tv. Aperture manually
controlled with aperture ring, shutter
speed with AT dial.
four spindles. Electronically controlled,
steplessly, from 30 sec. to 1/1000 sec.
Shock and noise damper mechanisms are
incorporated.
2, 4, 8, 15, 30, 60,125, 250,500, 1000
plus P (with the AE mode selector at Tv).
"P" setting is for programmed AE mode.
Intermediate speeds not on the scale can-
not be set.
11 • 16-22 (with the AE mode selector at
Av).
step button with electromagnetic shutter