Nikon Guide number at flash-to-subject distance of 1m approx .3ft, With SB-21A

Page 40

GUIDE NUMBER ---------------

See the table below for guide numbers.

Guide number at flash-to-subject distance of 1m (approx. 3.3ft.)

Amount of light output

 

 

 

ISO film speed

 

in M mode

25

50

100

200

400

800

For both flash modules

6.5

9

13

18

26

36

with controller batteries

(21)

(30)

(43)

(60)

(85)

(120)

Full

 

 

 

 

 

 

For only one flash

7.5

11

15

21

30

42

module or with external

(25)

(35)

(49)

(69)

(98)

(139)

power source·

 

 

 

 

 

 

1/4

3.2

4.6

6.5

9

13

18

(10)

(15)

(21)

(30)

(43)

(60)

 

1/16

1.6

2.3

3.2

4.6

6.5

9

(53)

(7 .5)

(10)

(15)

(21)

(30)

 

Unit: m(ft.)

1000 1600

41 52

(135)(171)

48 60

(156)(197)

21 26

(68)(85)

10 13

(34)(43)

•For external power source with only one flash module, see the figure indicated in the column to the right (column for one step higher film speed)

In TTL auto flash operation, for usable apertures with a reproduction ratio lower than 1: 10, use the following equation:

 

guide number at

guide number at

Usable

full output

1/16 output

lis tops -

flash-to-subject

flash-to-subject

 

distance

distance

In manual flash operation, for usable aperture with a reproduction ratio lower than 1:10, use the following equation:

guide number

Usable flstop = -- = ---------

flash-to-subject distance

READY-LIGHT INDICATIONS -----------

When the controller AS-12 or AS-14 is turned on, the controller ready-light comes on to indicate flash is ready to fire.

To activate the viewfinder ready-light function when us- ing the Nikon F4-series, F-801 /N8008, FA, FE2, F-501/N2020, F-301/N2000, FG or FG-20, turn on the

camera meter by lightly pressing the shutter release button.

With alkaline-manganese or zinc-carbon batteries, if the ready-light takes more than 30 sec. to light up, replace batteries with a fresh set.

Ready-Light Warning Functions

To prevent errors listed below, the ready-lights inside the camera's viewfinder and on the controller blink, after the S8-21 is turned on.

With SB-21A

Blinking ready-light

Inside

viewfinder On AS·12

00

0-

Problem and remedy

1)The AS-12'smounting foot is not securely locked. Firmly tighten lock ring .

2)The AS-12 is set at TTL with a camera other than a Nikon F3-series camera. Reset flash mode selector to M.

3)In TTL mode, the film speed setting on the camera is beyond the usable range . Use film within range of ISO 25 to 400 .

4)The flash fired at full light output in TTL mode ; lighting might be insufficient. (See page 37).

The shutter speed set on the FM2 or FE is faster than the flash sync speed. Reset to flash sync speed or slower.

40

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AS 1408B- 2liiafflJ ?-7FfflLf=fIH9 J -J, ~OmlH~IfIL 7-7--tj TiY 90C, tJliLJ.lfr.!ih!H±-lt-A#UIDJIi~ t ti I * 9 . ti tJ , O.!I f= 1j.H!Ofl/l SB-210*f.ttJJ UJ/~ D-5-AS-12, 14fiilJhf=HJ!J ~. t C9 0 4-7 7 ~j -t,~M~2-7 7 tJi1!lJ1l, Jij ~. t t ~ IH 9 0 ~ t- i ~ l~ if!i.lil.aJ~ t- i ~ l~ *1* t 1!ilffi.tJC, ~ ~ .J ? ~ lc t ~ l I ~WIi milffi., 1~iicLltj,IiR It/it £ 9IJ £ 9 IJ £9~FOREWORD=====~ Power cord Condenser Adapter SW·862mm adapter ring To fire both flash modulesAc~epts power cord of the S8-21 main unit Setting to M manual or TTL turns on the S8-21To be used for TTL auto flash operation with F3 Controller AS-14Before Using the SB-21 Usable LensesAF Zoom·Nikkor lenses cannot be used with With non·AF zoom lensesInstalling Batteries in Controller Attaching Controller and SB-21 Main UnitWith AS·12 With AS·14 With AS·14 With AS·12Attach the 58·21 to the lens Connect the 58·21 Main Unit ControllerLCD shows Or slower As set 11250LED lor manually set shutter speed lights up M90 and B··TTL Auto Flash Shooting Set lens index to the red RE- Verse position400 With F4·series, F-801 /N8008Select and set aperture For external power source For batteriesInside the controller Set the power/mode Switch to OFFWith lens in normal position When the 58·21 is powered from the external power source Reset lens to an aperture 1/2 stop smallerLA·2 or LD·2 With the Condenser Adapter 5W·8 attachedReady-Light Warning Functions Guide number at flash-to-subject distance of 1m approx .3ftWith SB-21A Using the Focus Illuminator With 5B-21BTTL Multiple Flash Photography With the SB-21 BMaster flash unit Connect to + Connect to = --+Connect toMe ~ -l Slave flash unitExternal Power Source After useAbout grounding Unplug the SC-21 s other plug from the S8-21DC Power Unit LD·2 Turn on the LD-2. FigAfter use Turn off both controller and LDTips on Speedlight Care About BatteriesRange in TTL F4-series, F-801/N8008 Mode VerticalInclude optional AC Unit LA-2 DC Unit LD·2 which holdsFor Micro·Nikkor 55mm fI2,B and 55mm fl3.5 Normal position J571~QilIE~~~0*6f1JGraph For Micro·Nikkor SSmm 1/2.8 and SSmm 1/3.5 Reverse position For Micro·Nikkor 10Smm 1/2,8 in reverse positionIII For Micro-Nikkor 10Smm 1/4 in normal positionFor Micro-Nikkor 10Smm fJ4 in reverse position For Micro-Nikkor 200mm fJ4 in normal position71701 05mmf /4~1oJ~~.IIl~ 20mm 85mmv- 7170 v-~~iEloJ ~~.IIl ~M/ \ Nikon Phone 81-3-3214-5311 Telex Nikon J22601 FAXPara usar el objetivo AF Micro-Nikkor de 60mm fl2,8 con el Fixation du 58-21 a Iobjectifen position normaleAcoplado del 58-21 al objetivo en posicion normal NormaIe Determining aperture according to shooting distanceUsage de IobjectifAF Micro·Nikkor 105mm f/2,8 avec Ie 5B·21 Fixation du 5B·21 aIobjectif en positionPara usar el objetivo AF Micro-Nikkor de 105mm 1/2,8 con el ~ oJL-60 mmF2 I JIlft wr 1fffl f.I g 1 JIl1t It1i Wie Sie das S8·21 am normal angesetzten Objektiv befestigenUsage de Iobjectif AF Micro·Nikkor 60mm fl2,8 avec Ie S8·21 Wie Sie die 81ende je nach Aufnahmeabstand bestimmen Seite

SB-21 specifications

The Nikon SB-21 is a highly regarded external flash unit that has earned a reputation among photographers for its versatility and reliable performance. Designed for use with Nikon’s line of DSLR cameras, this compact flash unit is favored by both amateur and professional photographers alike.

One of the key features of the SB-21 is its powerful guide number, which provides robust illumination in various settings. This allows users to effectively light subjects even in challenging low-light environments or larger spaces where additional lighting is essential. The SB-21 also boasts a range of customizable settings, giving photographers control over the intensity and direction of light.

The flash offers a zoom head, which allows it to cover various focal lengths. This adaptability is particularly beneficial for photographers who frequently switch between wide-angle and telephoto lenses. The ability to zoom not only enhances light coverage but also ensures that the flash can be fine-tuned to match the specific needs of each shot.

In terms of technology, the SB-21 integrates Nikon’s advanced i-TTL metering system. This intelligent system measures the light needed for a scene and adjusts the flash output accordingly, resulting in well-exposed images with minimal user intervention. This feature enables photographers to focus on their composition without worrying about manual exposure settings.

The build quality of the SB-21 is another highlight, as it is designed to withstand the rigors of regular use. It features a durable exterior that enhances its longevity, making it a trustworthy tool for outdoor and event photography. Additionally, the flash unit supports wireless operation, enabling users to trigger it remotely for creative lighting setups.

The Nikon SB-21 also includes a variety of accessories, such as diffusion panels and bounce cards, allowing further customization of light output to achieve specific effects.

Overall, the Nikon SB-21 stands out as a reliable and feature-rich external flash unit that meets the demands of various photographic styles. Its versatility, intelligent technology, and robust construction make it an essential accessory for any Nikon photographer looking to enhance their lighting capabilities. Whether shooting portraits, events, or creative projects, the SB-21 delivers exceptional performance and quality, making it easier to capture stunning images in any lighting condition.
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