Canon A-1 Repair Manual page 27

26
shutter has closed.) To insure a stable
viewfinder display, the viewfinder indi-
cation is supposed to display 60 to 80 mm second after
the shutter button is depressed halfway. But, this
gives rise to no delay in exposure determination.
TO
cancel
the error mark in order to restore the
camera for normal usage, set the multiple exposure
lever, and wind the shutter.
When the multiple exposure lever is set, the error
mark goes out and the camera shows correct exposure
data in the viewfinder. But, the shutter button can-
not be pressed until the film advance lever is operated.
When the viewfinder indicates the battery charge com-
platton for the Speedlite 199A or l55A, the degree of
the LED illumunation is constant regardless of the
existing light level. In this situation, the LED
illumina tion is the same as that which viewfinder
shows when the light level in the viewfinder is in
the EV 5 to EV 11 range. For this reason, the LED
illumination for flash photography is not always the
same as that for AE photography.
With the Speedlite 199A, if the shutter button is
held in the depressed position, the "F" indication
will not be displayed at flash charge completion be-
cause the camera ignores that signal, and remains in
AE mode rather than switching to Flash AE.
Among the lenses which were manufactured before
January,
1977,
there are lenses
with
maximum apertures
of f/l.8, f/2, f/2.5, f/3.5, and f/4.5.
In TV priority mode setting, the maximum aperture (AVO)
warning may display a
f
Number 0.5 steps different
than the actual aperture. With aperture priority mode
setting, some of them may give a slightly different
shutter speed information. With programmed AE mode
setting, some of them may give a slightly different
aperture information. This is because the aperture
value will shift to an adjoining pattern depending
on differences in the height of the lens speed adjust-
ment pin. (However, there is practically no exposure
errors.)
The FD 35-70mm !/2.8-3.5 S.S.C. lens has maximum
apertures from f/2.8 to f/3.5 depending on the focal
length. The height of the lens speed adjustment pin
of this lens originally was determined based on the
intermediate value of f/3.l4, but now it is set to