Nikon SB 800 Instruction Manual - Page 110

Setting the built-in wide-flash adapter and adjusting the, zoom-head position, Setting the aperture

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Close-up flash operation ■■■ Setting the built-in wide-flash adapter and adjusting the zoom-head position 1 Slowly pull out the wide-flash adapter all the way, and position it over the flash head. Then slide the bounce card back into place inside the flash head. 2 Press the c or d button to adjust the zoom head position to 14mm or 17mm. • When the wide-flash adapter is set on the flash head, the power zoom function becomes inactive and the zoom-head position is adjusted to 14mm or 17mm. To adjust the zoom-head position, go to the Custom Settings "Zoom-head position setting if the built-in wide-flash adapter is broken off accidentally" (p. 67). • To slide the wide-flash adapter back into place, lift it and push it into the flash head as far as it will go. ■■■ Setting the aperture Calculate the aperture by using this equation and table. To ensure the correct exposure, use an aperture smaller than the one obtained from the equation. ISO sensitivity Coefficient (m/ft) 25 50 100 200 400 800 1000 1.4/4.6 2/6.6 2/6.6 4/13 4/13 5.6/18 5.6/18 f/stop ͧ Coefficient ÷ Flash-to-subject distance For example, at an ISO sensitivity of 100 with a subject 0.5m (1.6 ft.) away and the wide-flash adapter in place, the suggested aperture is: f/stop ͧ 2 ÷ 0.5 = 4 (in meters) f/stop ͧ 6.6 ÷ 1.6 = approx. 4 (in feet) Therefore, you should use at least f/4 or an even smaller aperture, such as f/5.6 or f/8. 104

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104
Close-up flash operation
■
■
■
Setting the built-in wide-flash adapter and adjusting the
zoom-head position
1
Slowly pull out the wide-flash adapter all the way,
and position it over the flash head. Then slide the
bounce card back into place inside the flash
head.
2
Press the
c
or
d
button to adjust the zoom
head position to 14mm or 17mm.
•
When the wide-flash adapter is set on the flash head,
the power zoom function becomes inactive and the
zoom-head position is adjusted to 14mm or 17mm.
To adjust the zoom-head position, go to the Custom
Settings “Zoom-head position setting if the built-in
wide-flash adapter is broken off accidentally” (p. 67).
•
To slide the wide-flash adapter back into place, lift it
and push it into the flash head as far as it will go.
■
■
■
Setting the aperture
Calculate the aperture by using this equation and table. To ensure the correct
exposure, use an aper
tur
e smaller than the one obtained fr
om the equation.
ISO sensitivity
25
50
100
200
400
800
1000
Coefficient (m/ft)
1.4/4.6
2/6.6
2/6.6
4/13
4/13
5.6/18
5.6/18
f/stop
±
Coefficient ÷ Flash-to-subject distance
For example, at an ISO sensitivity of 100 with a subject 0.5m (1.6 ft.) away and
the wide-flash adapter in place, the suggested aperture is:
f/stop
±
2 ÷ 0.5 = 4 (in meters)
f/stop
±
6.6 ÷ 1.6 = approx. 4 (in feet)
Therefore, you should use at least f/4 or an even smaller aperture, such as f/5.6
or f/8.