Sigma C21EN0291 User Manual

The camera will fix and memorize the exposure value, while you press the “AE” 
Lock button. When you wish to lock the exposure of a subject off-center, AE 
lock is very useful. Use of this function with Center Area Metering Mode is 
recommended. 

 
 
 

1 

Center the subject inside the viewfinder, then 
press the shutter button “Half-way”. 
 
 

 

 

2 

Keep shutter button “Half-way” depressed, and 
then push the “AE” lock button. (While operating 
the AE lock, the displays of the shutter speed 
and aperture value in the viewfinder are locked 
and “AEL” is visible). You can release the shutter 
button. 
 
 

 

3 

Hold the AE lock button while you compose the 
picture. Then press the shutter button to take the 
picture. 
 
 
 
 

 
 

When the subject is out of focus during AE lock operation, remove your finger 
from shutter button and press the shutter button “Half-way” again, or remove your 
finger from the AE lock button and restart from the beginning. 

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