Sekonic L-398M 用户手册

 

 

 

 

 

 

  Employ for illumination contrast 

Adjustment and luminance measurement. 

•

 Contrast measurement 

a. Mount Lumidisc 

sensor 

Install in the same 

manner as Lumisphere. 

b. Hold meter at subject position 

and point Lumidisc 

directly toward center of main light. 

c. Press stopper button 

read meter scale footcandle 

indication 

d.  Turn the memo pointer dial and set the 

pointer 1 7 at the footcandle value the 

needle points to 

e.  In the same manner, measure the fill-in 

light. In this case, use care that light from 

main source dose not enter sensor. 

f. 

Read a difference between the 

footcandle value the pointer is set (see 

above c) and the one for fill-in light 

(= 

needle position. 

Ratio between main and fillip light 

footcandles becomes the contrast ratio. 

Example: 

With main light at 640 

footcandles, fill-in light reads 

320 footcandles. Illumination 

contrast ratio becomes: 

 

  640 

2 

320 

1   or 2 : 1 

 
 
 

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