Nikon SB-140 UV flash photography, Infrared photography, 1652 826, Num Desired ISO film speed

Page 27

UV flash photography

Turn the exposure calculator dial so the AUTO/MFULL index is opposite UV for full output, or the M1/4 index is opposite UV for 114 output.

Read the f-number which appears directly above the dis- tance scale.

To assure correct exposurE!, it is recommended that you take additional shots with the lens opened up or stopped down by one flstop.

Note that the exposure calcu lator dial of the S8-140 is designed for use with Kodak Spectroscopic Type 103 -0 film as the standard. With other films, the dial should only be used as a guide.

Infrared photography

Turn the exposure calcu lator dial so the AUTO/MFULL index is opposite IR for full output, or the M1 /4 index is opposite IR for 1/4 output.

Read the f-number which appears directly above the dis- tance scale.

To assure correct exposure, it is recommended that you take additional shots with the lens opened up or stopped down by one fIstop.

Note that the exposure calculator dial of the S8-140 is designed for use with Kodak High-Speed Infrared Film 2481 as the standard. With other films , the dial should only be used as a guide.

Guide number

 

 

 

 

m(rl)

 

Shooting condition

Visible-

UV"

Infrared'"

 

 

Shooting mode selector""

light '

 

 

 

 

 

"'"

FULL

32( 105)

16(52)

22 (72)

 

1/4

16(52)

8(26)

11 (36)

'At ISO 100

"With Kodak Spectroscopic Type 103-0film ; see page 31 for details.

". With Kodak High-Speed Infrared Film 2481 see page 31 for details.

Without referring to the exposure calculator dial, you can also determine the f/stop by using the following equation:

guide number

f/stop =- -- = ---- ---

flash-to-subject distance

For example, to get the proper aperture for visible-light photography when using ISO 100 fi lm and a subject 8m away, divide 32 (guide number) by 8 to get f/4 .

To calculate the correct guide number for other ISO fi lm speeds, use the following equation:

guide number for

·d

e num

b

er

 

desired ISO film speed

.

gUI

 

x

other ISO film

=for ISO 100

 

100

speed

 

 

 

 

 

 

 

 

 

 

 

27

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