Modern Classic SLRs Series :
User's Manual for Nikon BC-7 Flash Unit

NIKON FLASH UNIT

BC-7 is the compact and light weight and yet quite powerful flash unit, to fit the Nikon F camera. The flash unit BC-7 makes electrical connection with the flash synchronization terminal in the Nikon F, Nikon F Photomic, or Nikon F Photomic-T camera (other later F-models applicable), only by fitting into the camera accessory shoe, eliminating the need for connecting cord.

| Instruction Manual for NIkon BCB || NIkon BC-5 | NIkon BC-7 | NIkon SB-1 |
Some Images of mine set

bc7manualA.jpg (32k) Loading ....

Technical Highlights:

  • It is provided with a three-way socket which permits the use of three types of flash bulbs; S. C. bayonet base,,miniature base (MZ) or AG-1 (All-Giass).
  • When you insert a flash bulb into the socket, it charges the capacitor instantaneously and automatically, thus avoiding drain of the battery.
  • it is provided with test circuits for checking each flash bulb, charging of the capacitor, the synchronization circuit as well as connection of the flash unit.
  • The synchronization cord socket, provided besides, permits the use of the unit for extension flash.
  • The collapsible, fan-fold type reflector affords compactness and great facility for carrying about the unit.

Specifications:

Flash bulb socket: Three-way type socket permits use of any one of the following three types of flash bulbs.
a) S. C. Bayonet base b) Miniature base (M 2) c) AG-1 (All-Glass)

illuminating angle: Approx. 65°

Cover.jpg
Credit: Based on scanned copies contributed by Mr Enzo Mazzeo <enzomazzeo@tin.it>

Enzo Mazzeo Via Bonito, trav. priv. 11 80129 NAPOLI ITALIA Tel/Fax +39 081 5566616 Mobile +39 335 5323175

Tilt-back angle of the reflector (for bounce flash): Click-stops at 0° (for general use), 30°, 60°, 90° and 120°.
Power source: B-C type
: The capacitor is automatically charged by fitting a bulb to the socket.
Battery to be used
: 15V laminated dry battery (Everyday No. 504 or the similar) (This type battery is available on the market.)
Testing system
: Checks the synchronization circuit, connection of the flash bulb and charging circuit.
Connection to the camera
: Direct, cordless connection to the flash terminal on the camera accessory shoe.
Synchronization cord socket
: PC type socket is provided for connecting the cord for extension flash.
Weight
: Approx. 180g (without laminated battery)

vvvvvbc7manualB.jpg (38k) Loading... bc7manualC.jpg (28k) Loading ... bc7manualD.jpg (43k) Loading ...

LOADING THE BATTERY

Pushing downwards the release clip on the back of the unit, to open the cover. Insert the laminated battery 15V (Eveready No. 504 or the similar) into the unit, according to the plus and minus symbols. Loop the vinyl tape under the battery to facilitate the removal of the battery.

bc7manualE.jpg (38k) Loading ....
FITTING/ATTACHING THE UNIT TO THE CAMERA

!) Slide in the foot of the flash unit from the rear of the camera into the camera accessory shoe as far as it will go, where the terminal on the flash unit comes into contact securely with that on the rear of the accessory shoe. To detach the unit, reverse the above procedure. It is convenient to fold up the reflector in mounting or dismounting the flash unit. (Fig. 5). 2) Keep pushing the red button for 3-4 seconds. While pushing this button, depress the shutter release button on the camera. (Fig. 6 (b). If the inside test bulb glows instantly (visible through the back cover of the flash unit), it indicates that the circuit is functioning properly.

NOTE: If the test bulb does not light in this test, check the following: Imperfect contact of the terminals, Drain of the battery, Trouble in the capacitor, Disconnection of the test lamp, etc.

OPENING THE REFLECTOR Spread out the reflector, When fully opened, the ends of the reflector are to be hooked up together. For closing, release the vvvvvends of the reflector. ATTACHING THE FLASH BULB Push the bulb into the socket on the flash unit so that it is held securely. To remove the bulb from the unit, push the bulb ejector button on the head. The bulb will drop off.

vvvvvbc7manualF.jpg bc7manualG.jpg bc7manualH.jpg
CHECKING THE FLASH BULB Attach a-flash bulb by inserting its base into the socket.

vvvvvbc7manualI.jpg
1) A few seconds afterward, push the charge testing button.
2) If the inside test bulb glows briefly, this indicates that the flash bulb is good and the capacitor has been charged.
3) attach the flash unit onto the Nikkormat FT or FS, use the accessory shoe (i), flash unit adapter (ii), both exclusively designed for the camera, and the synch. cord (iii) (20cm long). The accessory shoe is fastened under the finder eyepiece. Once moved from the camera. On the flash synchronization, refer to the instructions of Nikkor/Nikkormats.

Exposure Calculation The calculator provided on the flash unit BC-7 is primarily designed to facilitate the use of a flash bulb for focal-plane shutter. Set the film speed (ASA) graduated on the upper revolving dial to the shutter speed graduated on the inside fixed dial, and the correct exposure will be obtained by reading the lens aperture on the fixed dial or the subject distance on the revolving dial, either being brought into coincidence with each other.

bc7manualK.jpg
Example 1.

Flash bulb: G.F. No. 6 or Sylvania FP 26
Shutter speed: 1/125 sec. (Turn the synch. selector dial on the Nikon F until the green dot appears in the window.)
Speed of film: ASA 160
Distance to the subject: 10 ft.
1. Turn the revolving dial to set the ASA figure 160 for black-and-white film (in black) to the shutter speed figure 125.

2. The correct exposure will be obtained with an aperture of about f/11 at the distance of 10 it.

bc7manualL.jpg
Example 2.

Flash bulb: G.E. No. 6B or Sylvania FP 26B
Shutter speed: 1/125 sec. (Turn the synch. selector dial on the camera until the green dot appears)
Speed of film: ASA 64
Distance to the subject: 10 ft.

1. Turn the revolving dial to set the ASA figure 64 for color film (in red) t6 the shutter speed figure 125.
2. The correct exposure will be obtained with an aperture of about halfway between f/4 and f/5.6 at the distance of 10 ft.

bc7manualM.jpg
Example 3.

Flash bulb: G.E. AG-1 or Sylvania AG-1
Shutter speed: 1/30 sec. (Turn the synch. selector dial on the Nikon F until the white dot and F appears in the window.)
Speed of film: ASA 160
Distance to the subject: 10 ft.

1. Turn the revolving dial to set the ASA figure 160 for black-and,white film (in black) to the white dot (for AG-1).
2. The correct exposure will be obtained with an aperture of about f/11 at the distance of 10 ft~

EXPOSURE DETERMINATION BY GUIDE NUMBERS

The maker of each type flash bulb publishes the guide numbers, which are conveniently used to determine the correct exposure. Divide the guide number by the subject distance or the f-number, and you will be given the f-number or the subject distance to be set, respectively.


GN.gif

However, since such guide numbers are generally given on the basis of a fixed-type, large-diameter reflector with a polished reflecting surface, and not of a fanfold, wide-angle type reflector with a light scattering reflecting surface, such as of the BC-7 flash unit, it is necessary to increase the exposure by opening the aperture about a half stop larger than the value obtained by the above calculation.

Example 1.

Flash bulb: G.E. M2 or Sylvania M2
Shutter speed: 1/30 sec. (Turn the synch. selector dial on the Nikon F camera until a white dot and F appear in the window.)
Speed of film
: ASA 125
Guide number
: About 200
Distance to the subjec
t: 15 ft.

GN2.gif
Then. open the aperture of lens a half stop, larger than f/13.3, that is, about f/11.

bc7manualN.jpg bc7manualO.jpg
BOUNCE FLASH The reflector of the BC-7 flash unit can be tilted Upwards and backwards through an angle of 120 degrees (with click stop at every 30 degrees) for bounce flash. The bounce flash which produces indirect, diffuse light reflected from the surrounding wall or ceiling is useful for making a picture of soft tone without involving sharp shades or shadows. However, as the intensity of light in this case is much reduced, it is necessary to increase the expo. sure as compared with the direct, front flash. The degree of this increase varies with the reflecting ratio, distance of the reflecting surface, etc.

EXTENSION FLASH The sync. cord terminal, provided besides the cordless terminal on the Unit, permits the use of the flash unit held at any desirable angle and distance from the camera.

USE OF SYNCHRONIZATION SELECTOR ON THE NIKON F

Flash Bulbs

Shutter Speeds

Class

Types

Makes

G.E.

Sylvania

1000

500

250

125

60

30

15

8

4 2

1

B

FP

Bayonet

No. 6

FP26

 

greenbtn.gif

 

 

redbtn.gif

 

 

 

 

 

 

 

No. 6B

FP26B

 

greenbtn.gif

 

 

redbtn.gif

 

 

 

 

 

 

 

M

Bayonet

No. 5

Press 25

 

 

 

 

 

 

 

 

 

 

 

 

No. 5B

Press 25B

 

 

 

redbtn.gif

redbtn.gif

 

 

 

 

 

 

 

MF

Miniature
(M2)

M 2

M 2

 

 

 

 

 

 

 

whitebtn.gif

 

 

 

 

M 2B

M 2B

 

 

 

 

 

 

 

 

 

 

 

 

M 5

M 3

 

 

 

 

 

 

 

 

 

 

 

 

M 5B

M 3B

 

 

 

 

greenbtn.gif

 

 

 

 

 

 

 

AG-1

AG-1

AG-1

 

 

 

 

 

 

 

 

 

 

 

 

AG-1B

AG-1B

 

 

 

 

 

 

 

 

 

 

 

 

Credit: This Nikon BC-7 Manual was based on some scanned copies of the actual Instruction Manual contributed by a Nikon Collector from Italy. Mr Enzo Mazzeo <enzomazzeo@tin.it>

NavBar
  | Close This Window |
About this photographic site
Contributions and Credits
  Home - Photography in Malaysia


Modern Classic SLRs Series :
User's Manual for Nikon BC-5 Flash Unit

Copyright © 1999. leofoo ®. MIR Web Development Team.