Bedienungsanleitung Nikon SB 50DX (Seite 17 von 39) (Englisch)

3274

Zoom out

Zoom in

Vorherige Seite

1/39

Nächste Seite

3332

Detailed Operation

Reading Variable Aperture of Zoom Lenses

Guide Number

Some zoom lenses have variable aperture (lens’ brightness) with zooming

(variable focal length). (For details, see the lens’ instruction manual.) For

example, a lens such as the AF Zoom-Nikkor 28-105mm f/3.5-4.5D has

two maximum aperture values. Follow the instructions below to determine

aperture with such lens.

• Reading aperture in the camera’s LCD panel and/or inside the

viewfinder

• After zooming in/out for composing, set the aperture and confirm the aperture

value in the camera’s LCD panel and/or inside the viewfinder. The

compensated aperture value is displayed. Aperture value displayed in the

aperture-direct-readout scale through the camera’s viewfinder (of the Nikon F5

or other cameras that are compatible with aperture-direct-readout scale), is

fixed and not compensated as "Reading aperture with the scale on the lens"

below.

• Reading aperture with the scale on the lens

• After zooming in/out for composing, read

aperture with the aperture scale on the lens. For

the shortest focal length setting, read the

aperture value at the green index (or line index);

for the longest focal length setting, read the

value at the yellow index (or dot index). For

intermediate focal length settings, read the

aperture value between the two indexes.

• Aperture ring and aperture scale are not

provided with the G-type Nikkor lens and the

aperture cannot be read with the scale on the

lens.

• Reading aperture of the CPU lens with the Nikon F-401x/N5005,

F-401s/N4004s, or F-401/N4004 camera

• Set the camera’s exposure mode to Aperture-Priority Auto (A) or Manual (M)

and read the aperture value with the camera’s dial. Although the aperture

varies during zooming, the camera automatically compensates the lens value

for correct exposure. Setting the aperture dial to a smaller value than the lens’

smallest f-number (maximum aperture) or to a larger value than the lens’

largest f-number (minimum aperture) sets the lens aperture to the lens’

maximum or minimum aperture.

• In Programmed Auto/Auto-Multi Program (P) or Shutter-Priority Auto (S)

exposure mode, the aperture value set on the lens cannot be confirmed. In

addition, the shutter cannot be released in Manual flash operation (p. 31).

The guide number indicates the power of the flash. It varies according to

ISO film speed (sensitivity) and zoom-head position.

• Equations including guide number

•

The table below shows the guide numbers for the SB-50DX with ISO 100 sensitivity:

(14mm zoom-head position: with the wide-flash adapter, p. 17).

Zoom-head position 14mm 24mm 28mm 35mm 50mm

Guide number (m/ft.) 12/39 18/59 20/66 22/72 26/85

• Use the following equation to determine the correct aperture:

f/stop =

guide number

flash-to-subject distance

Or, use the following equation to determine the flash-to-subject distance:

flash-to-subject distance =

guide number

f/stop

• For sensitivity other than ISO 100, multiply the guide number at ISO 100 by the

factors shown in the table below:

ISO film speed 25 50 200 400 800 1600

Factor X0.5 X0.71 X1.4 X2 X2.8 X4

• For close-up flash photography, see p. 43.

• Guide number in 1/300 TTL High-Speed Sync (with the F5 camera)

•

The table below shows the guide numbers for the SB-50DX with ISO 100 sensitivity:

(14mm zoom-head position: with the wide-flash adapter.)

Zoom-head position 14mm 24mm 28mm 35mm 50mm

Guide number (m/ft.) 9.5/31 10/33 11/35 12/38 14/44

• Combined guide number

• Calculating the combined guide number of two or more Speedlight units may

be necessary when performing double-flash operation (p. 54) or illuminating a

distant subject (p. 62). The combined guide number is calculated using the

following equations. The guide number varies according to ISO film speed

(sensitivity) and zoom-head position. For guide number information of the

camera’s built-in Speedlight or Accessory Speedlight other than the SB-50DX,

see your camera’s instruction manual or Speedlight’s instruction manual.

Combined guide number in double-flash operation (GN = guide number):

Combined GN = (GN of the SB-50DX)

+ (GN of the camera’s built-in Speedlight)

Combined guide number in multiple flash operation (GN = guide number):

Combined GN = (GN of Speedlight A)

+ (GN of Speedlight B)

+ (GN of Speedlight C)

+ ...

SB-50DX (E) 02.12.9 2:33 PM Page 32

Missbrauch melden von Frage und/oder Antwort

Libble nimmt den Missbrauch seiner Dienste sehr ernst. Wir setzen uns dafür ein, derartige Missbrauchsfälle gemäß den Gesetzen Ihres Heimatlandes zu behandeln. Wenn Sie eine Meldung übermitteln, überprüfen wir Ihre Informationen und ergreifen entsprechende Maßnahmen. Wir melden uns nur dann wieder bei Ihnen, wenn wir weitere Einzelheiten wissen müssen oder weitere Informationen für Sie haben.

Nikon SB 50DX Seite 17

Brauchen Sie Hilfe? Stellen Sie Ihre Frage.

Missbrauch melden von Frage und/oder Antwort

Art des Missbrauchs:

Forenregeln

Neu registrieren

Andere Handbücher von Nikon SB 50DX

Das Handbuch wird per E-Mail gesendet. Überprüfen Sie ihre E-Mail.

Ihre Frage wurde zu diesem Forum hinzugefügt

Info