If the aperture number blinks when it's set at a high number such as F22, the subject is overexposed.
Ọ bụrụ na nọmba ọnụọgụ ahụ na-ada ụda mgbe a debere ya na nọmba dị ala, dịka F2.8, isiokwu ahụ dị oke ọchịchịrị.