Руководство По Работе для Zorki 10

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To obtain the correct exposure of the main (dark) object of photographing set smaller 
value of the film sensitivity as compared with practically used one. 
In this case good results are usually obtained when sensitivity decreases on one step 
of the sensitivity scale. For example, when photographing on the film of 80 ASA unils 
sensitivity, set 40 ASA units on the scale. 
If the film sensitivity is given in DIN grades, then, for instance, 17 DIN grades should 
be set on the scale instead of the used film of 20 DIN grades. 
2. The main object of photographing is brighter than the surrounding background, for 
instance, when photographing an illuminated face of a person against the dark 
background. When photographing without correction, this picture of a person's face 
will be overexposed. In this case for obtaining the correct exposure of the main object 
set the larger film sensitivity as compared with the sensitivity of the film used. In 
practice there can be stronger contrasts, then the correct exposure of the main object is 
correspondingly obtained by other corrections.