The Flow Chart of how AMP Matrix Metering works. |
Aperture and Shutter Speed control in the Nikon FA
The aperture and shutter speed control of the FA is regarded a the same type of the FG added the aperture control on S mode.
1) Aperture control
a) Aperture control on 'S' (Shutter Priority AE) mode
Aperture will be stopped down to the following condition:
(BV-AV) = (TV-SV)
BV + SV = TV + AV
BV - AV: Central brightness value
TV - SV: Shutter speed value
b) Aperture control on
'P' (Programmed AE) mode
Aperture will be stopped down
to the following conditions:
(BV-AV) = -(BV-AV) + (AV0-SV+
) + (BV-AV0)
AV = 2 (BV+SV) - /2
(aperture value)
TV = 2 (BV+SV) - /2
(shutter speed value)
BV - AV: Central brightness value
BV - AV0: Correct exposure value (Program memory)
AV0 - SV +
: Aperture value
When lenses of 135mm or longer are used or teleconverters are attached, increases up to 5 and the high-speed
program mode is activated. Otherwise, remains 2 and the normal program mode works; is the same
program the FG has incorporated The focal length of a lens used is detected as Fmm
signal via the position of notch of lens.
c) Aperture control on 'A' (Aperture priority AE) and 'M' (Manual) modes
Aperture is stopped down to
the selected value on A and M modes, or when i) the ready-light lights up, ii) the
stop-down switch is closed, iii) the blank-shots switch is closed.
2) Shutter Speed Control on A, S and P modes
There is no operative difference between the three modes after shutter speed will be determined as follows.
(BV-AV) + (-SV) = TV
BV - AV: Central brightness value
- SV: AMP value
3) Flash output control on TTL mode
Monitor contact of speedlight SB-15/16 or equivalent flash units transmits TTL mode sigr to the camera The outputs of TTL flash senser circuit and speedlight SV are calculated to be utilized for the flash output control
4). Digital Shutter Speed Control
Shutter speed is controlled by clock of 524.288 kHz in ceramic oscillator.
a) Shutter speed control on M mode. 13 shutter speeds from 1/4000 to l sec. are controlled digitally.
b) Flash sync speed: Flash sync
shutter speed is controlled when ready-light lights up.
i) A, S or P mode: To be controlled
at l/250 sec.
ii) M mode: 1/500 - 1/4000 sec.: To be controlled at l/250 sec. 1 - l/250 sec.: To
be the shutter speed in use.
iii) Blank shots shutter speed control: While the blank shots switch is closed (before
frame counter reaches "1"), shutter speed is controlled at 1/250 sec. regardless
of the mode selection.
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The AI-S Nikkors (related info | TTL OTF Flash Metering | Interchangeable Focusing Screens. The MD-15/MD12/MD11 Motor Drives | 3rd party Power Winder (new) | Flash Units -SB-16 | SB-15 | SB-10 | SB-16B & Other Options | Databacks | Titanium Shutter | Variation : Mr Y K Wong from Singapore contributing 11 images of his Nikon FA GOLD
| Nikon FM series |
Nikon FE series |
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W A R N I N G: The New G-SERIES Nikkor lenses have no aperture ring on the lens, they CANNOT ADJUST APERTURES with any of these manual focus Nikon FE series SLR camera models; please ignore some portion of the content contained herein this site where it relates.
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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.