Shutter-Priority Automatic
Exposure Control
Setting the mode selector to S and lens aperture to the minimun aperture makes the
shutter-priority mode operate. Using ASA 100 film and 50mm fl.4 lens, set the shutter
speed dial to 1/125 sec. Then, the FA's shutter-priority automatic exposure control
is made as represented by the darker line in the graph.
Since the 50mm fl.4 lens has aperture f/numbers from fl.4 to f16, suitable aperture
to match the 1/125 sec you set is selected within this range depending upon the scene
brightness.
If suitable f/number for the 1/125 sec is available to match the scene brightness,
then the suitable aperture the FA selected is shown via LCD inside the viewfinder
display.
If the scene is darker than the light value determined by the combination of f1.4
(max. aperture) and the 1/125 sec. you set, the FA automatically overrides your choice
by selecting slower speed down to one (l) sec. In this case, automatically compensated
speed is shown via LCD instead of f/number. If the scene is still darker than the
lowest combination of fl.4 and one sec., then "
" is displayed via LCD, meaning
that the scene is too dark exceeding the FA's metering range.
To the contrary, if the scene is brighter than the combination of 1/125 and fl6 (min.
aperture), again the FA automatically overrides your choice by selecting faster speed
than you set up to 1/4000 sec and automatically compensated speed is displayed via
LCD. If the scene is brighter than the combination of fl6 and 1/4000 see, "
"
is displayed, meaning that the scene is too bright exceeding the FA's metering range.
As you may understand from the above, if the slower speed than you se-t is displayed
via LCD instead of f/number, max. aperture (fl.4) is selected. To the contrary, if
the faster speed is selected, then the minimum aperture (f16) is in operation (Remember,
in this discussion, a 50mm f1.4 lens is used, it may select f32 for a Micro Nikkor).
What will happen
if you inadvertently or intentionally set the aperture other than the minimum aperture?
Don't worry, you can still obtain correct exposure although operational range may
be limited depending upon the aperture you set.
The line shows the exposure control when you set the aperture at f5.6, not the minimum
aperture. In this case, if the scene brightness is within the range determined by
the combination of 1/125 sec and apertures ranged from f1.4 to f5.6 (your set aperturej,
then the correct exposure is obtained and f.No. is displayed via LCD. If scene is
darker than the combination of fl.4 and 1/125 see, then slower speed is automatically
set by cybernetic override and displayed by the LCD. If scene is still darker exceeding
the lowest limit of metering range (i.e. the combination of fl.4 and l see), "" is
displayed via LCD.
To the contrary, if the scene is brighter than the light value determined by the
combination of 1/125 and f5.6 (your set aperture), then smaller aperture cannot be
obtained because of your misseting of the aperture ring. In this case, the FA overrides
your choice by selecting faster speed than 1/125, and then display it via LCD. If
the scene is still darker than the combination of f5.6iand 1/4000 sec., then FEE,
not "",
is displayed meaning that you misses the aperture ring to settings other than the
minimum aperture.
Note: With an AI-modified Nikkor lens
Reflex Nikkor, PC-Nikkor, old type teleconverters (TC-200, TC-300 or TC-14), PK ring
or bellows attachment attached, the LCD shows 
', instead of the aperture selected by the
FA, because max.- aperture indexing post is not
provided on these equipment. If your set speed is inappropriate for the scene brightness,
automatically compensated speed is displayed via LCD as usual. Also note that because
of the same reason, multi-pattern metering does not
function with these equipment; only the centerweighted metering does.
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A contributing effort to Michael Liu's Classic Nikon SLR camera site.
Credit:
Lars Holst Hansen who
is co-maintaning the site; MClau, who patched a lot of mistakes for me on earlier
stage of the site; Miss Rissa Chan - Marketing
Manager and the members of technical service team of Shriro Malaysia (now Nkon Corporation
Malaysia); Mr Terence
HM Tan
for his FA/MD15 images; Mr Victor for his Nikon FA body, EEwyn, my nephew for some
of the scanning work; Mis Wati/Mis Mirza for their help on the OCR work on the instruction
manual section - We all had some real good times on the construction of this site.
Dave
Hoyt
who prepared the introductory page. Note:certain
content and images appeared in this site were either scanned from official marketing
leaflets, brochures published by Nikon and/or contribution from surfers who claimed
originality of their own work to publish in this site based on educational merits.
The creator of this site will not be responsible for any discrepancies that may arise
from such possible dispute except rectifying them after verification."Nikon", "Nikkormat", "Nippon Kokagu
KK"
& "Nikkor" are registered
tradename of Nikon Corporation Inc., Japan. Made with an Apple IMac.Dedicated to a friend: 'JB' whom
I have never met but remains a constant motivated force.