/j'571;:~QilIE~~~0)*6f)1J____________

DETERMINING APERTURE ACCORDING TO THE SHOOTING DISTANCE

"7 =.:1. ?11.-~7'CIl;fO)ilMlE~~HiiO)JHIJ 1;1:. ntIJat:l~S'1-\",II.-~

~ffl~~~~O)~~ • • rnO)~~~~t~ij8to)~.~

Bh~~~~7~~*~~~t~~~*~ . ~hfhO)~

~70)*IHi!I(;l:lll~~§:~(lIt~i*tJ· ~ 70f Il.-1..jjjj * c,O)~§:q). tIUi!l l;l:~ ~) iii('IlAA F iii C' (;I: to: < ~&:~) I) ;.. :7'c'alt)E~ '" ~ ~ ~)iii)~Bh~""(\"*~.

~l~ 7tJ' ~~~) iii HitJ;.1!i! .., cjil~9 .Q~(;I:. :J?O),9.I:~' ;U~: (t: ~ L'

(j):7'~ 7 l;t~c 7 of 1("1..~Jt1S0 1000) t ~ 0) to) c ' "t .

ISO I00l:..l9}0)!tl\/f0)7111.-1..H~ffl ~ ~ t/!.g.I;I:. ~/f 1:J;i5

~cmJ;.I!i!..,~.~8~MlE~~~.~~ij~~ .

,1JI')HlI~ fSl')~~(

+ -------->

!X'iIi!! 4 ~ 3ll 3 1% III 1 1% III I % II 0 ~ % I I~ 1% 1 ISO 1600 1150 1Il00 800 640 500 400 31Q 150 1QO 160 115 100 80 64 50 40 31 15

<V~7'C~§:~tJ'40mmJ;..lp>O)t~. ;!!i7'C?:$"7:$'-SW-8~iif

ffl ~t:t/!.g.I;I::7' ~7tJ'~ij'CJ;.Jl)ht:.~)iifitJ'~. i!< ~I:

f-l I/2t5t. ~) il;A. C'( t: i!< L' .

Q)$'}$1Il:»'LA-2. * t:(;l:LD-2~i~ffl ~ . 7 =.:1. ? 11.-7II.-~ 7'C~rr1 t/!.g. (;I:. :7'~ 7tJ' ~ !j'CJ;.I!i! .., t:~ ~) 8tJ· ~ ,i!< ~

(:f-l 1 /2t5t.~)il;A.c' < t:i!<L' .

®:7' ~ 71;1:. 71:7 t:l ="/ ::J - 11.-0)to)~i!*L'c. B~ci!<

h cL '~ I; ;";(O)"¥i';Jiiic' Bhi!< h cL' ~ ~ . iiE.., c.

1;;" ;(1: J: .., c (;I: :l?y~~tJ'jo L; ~ ~ t t ~ ~J1 ~O)c'.

•J;.I!i! .., ~~ij8~~ ± I ~a/f~ij.~~~cWB~ c;f)(~t~;f)~~~~*~ .

@I;;" ;(lEloJ ~ 1l;f0) :7'~ 7 (;I: ~ii'i( I ii'i)J;XfO);f@'J'lil:BIl;f

O)to).I;;";(~IoJ~1l;f0)~~7~~.~~0)~*ffi~1l;f O)to)c'~ . jibc . 1;;";(lEloJ~c'jJ1;*lIlB~rr .., t:

ij~~• .g.~~. ~~7~~~ij8~.J;.I!i!~ ~t~ ~

~~ttA. .

7'770)!j'f.;s../.i

19~~(i71:7 t:l55mm F2. 81; ;" ;(~~1oJ ~ c'{~ffl. liUH§:~

tJ' O.4mO)t/!.g.(:;).:.-.:. -':;ft:~0)~~72~~~!O

IS0 1000)7 1 11.-1..c ' (;I: M 1/ 16 = f-l1/ 2. 8, M 1/ 4= f-l1/ 5 .6. MFULL =f-l I/ 11

IS0500)7 of 11.-1..c ' (;I: M 1/ 16 = i~ffl1'iiJ , M1/ 4 = f-l1/ 4,

MFULL = f-l1/ 8

150400 0)7 1 11.-1.. c'(;I: M 1/ 16 = f-J 1/5 . 6. M 1/ 4= f-J 1/ II .

MFULL = f-J I/ 22

tto:~) *~ .

The following graphs show the relationship between the subject-to-film-plane distance and aperture set on the lens at ISO 100.

Determine the proper aperture from the graph and set on the lens. For film speeds other than ISO 100, com- pensate the aperture. With one step lower film speed, use one stop wider aperture (smaller f-number), and vice versa.

Note that the graphs for lenses in normal position only show apertures at reproduction ratios lower than 1:1. Apertures are not given for higher reproduction ratios with lenses in normal position.

When using the Micro-Nikkor 55mm f/ 2.8 lens, for example, see graph 1,

With ISO 100 film , to shoot a subject Q,5m away from the film plane at 1/16 output, set the lens aperture to f/8 . If your film is ISO 25, set the lens aperture to f/4 .

With a subject closer than 40mm away from the flash modules, attach the Condenser Adapter SW-8 and reset the lens aperture to an aperture approx. 1/2 stop smaller.

When the S8-21 is powered by external power source LA-2 or LD-2, use an aperture approx. 1/2 stop smaller than that determined using the graph.

"717055mmf 2. 8·55mm fl 3. 5lEloJ~~fflll;f

For Micro·Nikkor 55mm fI2,B and 55mm fl3.5

in normal position

:7'~7 1

m

 

(ISO 100)

Graph 1

0 . 7

~"l

kFJII

 

 

 

0 .6

 

\ 1\

 

 

 

\ \ \

\

 

1\

1\

t

\

\

PK- 13fil!lIlll1i [

/

with PK - 13 . /

 

0 .2

 

0 .1

f / 1.4 2 2.8 4 5.6 8 11 16 22 32

_ II"L.o/;(~')fil

48

Aperture

Page 47 Page 49
Page 48
Image 48
Nikon SB-21 instruction manual J571~QilIE~~~0*6f1J, For Micro·Nikkor 55mm fI2,B and 55mm fl3.5 Normal position, Graph
Page 47 Page 49

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.
Top Page Image Contents