Nikon SB-900 Bedienungsanleitung Seite 73
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D
Flash modes and functions
in the Distance-priority, Manual and Repeating flash modes
Calculating the correct aperture
Determine the guide number by referring to the guide number table. The correct
guide number depends on the flash output level and zoom position. Next, calculate
the correct aperture by using the equation below. The correct aperture depends on
ISO sensitivity and shooting distance (m/ft.).
f/stop (aperture) = Guide number (GN at ISO 100; m/ft.) × ISO sensitivity factor ÷ Shooting distance (m/ft)
For example, for an ISO sensitivity of 400 (or ISO sensitivity factor: 2), with the
zoom position adjusted to 28 mm, and the flash output level set to M1/1:
Referring to the guide number table, determine the guide number as 30/98.4 (m/ft.).
When the shooting distance is 4 m (13.1 ft.), the correct aperture value is:
30/98.4 (GN at ISO 100, m/ft) × 2 (ISO sensitivity factor for ISO 400) ÷ 4/13.1
(shooting distance; m/ft.) = 15 (aperture)
Set the smaller aperture value (larger f-number) than calculated above on the camera.
Obtaining the correct fl ash output level
When the shooting distance and aperture are fixed, calculate the guide number (GN at
ISO 100; m/ft.) by using the equation below, based on shooting distance and aperture:
Guide number (GN at ISO 100; m/ft.) = Shooting distance (m/ft) × Aperture (f/) ÷ ISO sensitivity factor
Referring to the guide number table, determine an appropriate flash output level
corresponding to the guide number obtained above, then set the same value on the SB-900.
For example, for the shooting distance of 6 m (19.7 ft) with an aperture of f/8 and
the ISO sensitivity of 400 (ISO sensitivity factor: 2):
6/19.7 (shooting distance; m/ft.) × 8 (aperture value) ÷ 2 (ISO sensitivity
factor of ISO 400) = 24/79 (GN at ISO 100; m/ft.)
When the zoom position is adjusted to 35 mm, set M1/2 flash output level on
the SB-900, which can be obtained from GN 24/79 (m/ft.) corresponding to the
zoom position of 35 mm referring to the guide number table.
In Distance-priority manual flash operation, the correct flash output level is
automatically determined by the SB-900 according to the shooting distance,
aperture and ISO sensitivity that are set.
Calculating the shooting distance
Determine the guide number by referring to the guide number table. The correct
guide number depends on the flash output level and zoom position. Next, calculate
the shooting distance by using the equation below. The shooting distance (m/ft.)
depends on ISO sensitivity and aperture.
Shooting distance (m/ft.) = Guide number (GN at ISO 100; m/ft.) × ISO sensitivity factor ÷ Aperture (f/)
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- User’s Manual 1
- About this user’s manual 2
- Camera and lens combinations 3
- Simple search by objective 4
- About accessories 5
- Contents 6
- For your safety 10
- Preparation 13
- Check before Use 14
- Tips on using the Speedlight 15
- About the SB-900 17
- SB-900 features 18
- Main functions 20
- Support functions 21
- Operation 23
- Speedlight parts 24
- Basic operation 26
- Selecting the flash mode 29
- Control buttons 30
- Control button operation 31
- Two-button operation 31
- LCD panel 32
- Distance information 33
- ISO sensitivity 33
- Zoom position 34
- Light distribution angle 34
- Aperture value 35
- SB-900 condition 36
- Test firing button functions 36
- Wireless Lighting) (kD-43) 39
- Wireless Lighting) (kD-49) 41
- Custom functions and settings 42
- Custom setting 43
- Batteries 49
- Flash modes and functions 51
- Setting the i-TTL mode 52
- Monitor pre-fl ashes 53
- Auto aperture flash 55
- Non-TTL auto flash 58
- Press the [MODE] button 61
- Manual mode 64
- Camera’s control panel 65
- Repeating flash 67
- Shooting with Repeating flash 69
- ISO sensitivity factors 72
- Center-weighted 74
- Standard 74
- Bounce flash operation 76
- Bounce-down icon 80
- Filters Purpose 83
- How to use color filters 84
- Making exposure compensation 88
- Notes on remote flash 90
- Using the Speedlight Stand 91
- Ready-light of 92
- Setting the SB-900 as 95
- Commander function 98
- Repeating flash shooting 99
- Master flash unit 101
- Remote flash unit 101
- (auto) mode: 101
- (manual) mode: 101
- Rear-curtain sync 106
- Power zoom function 107
- AF-Assist Illuminator 108
- Setting the ISO sensitivity 110
- Test firing function 110
- FX/DX selection 112
- CLS compatible SLR cameras 113
- SLR cameras 114
- COOLPIX cameras 115
- Tips on Speedlight care and 117
- Troubleshooting 118
- Thermal Cut-out 122
- Tips on Speedlight care 123
- Notes on batteries 124
- About the LCD panel 125
- Updating firmware 126
- Optional accessories 127
- Specifi cations 129
- Specifications 130
- 8 (BA+WP) – 134
- 8MSA3211-01 142
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