Canon A-1 - Manual (Page 92)

degree of LED illumination changes in four
stages depending on the brightness of the
subject seen in the viewfinder. When the
subject is brighter, the LED brightness is
slightly higher, and it is slightly lower with a
darker subject. As a result, the LED main­
tains an almost consistent degree of bright­
ness to the human eye.
The viewfinder information signal is trans­
mitted to the display every half second.
Accordingly, in rapicUy varying light con­
ditions, the changes in aperture or shutter
speed will be indicated slightly behind time.
This is a concession to the adjustment
limitations of the human eye which in no
way affects exposure timing.
-5