Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
Aperture value may refer to:
in the APEX system (Additive System of Photographic Exposure)
Aperture value mode (Av mode), an aperture priority mode on electronically controlled cameras
Topics referred to by the same term
This disambiguation page lists articles associated with the title Aperture value. If an internal link led you here, you may wish to change the link to point directly to the intended article.
Category:
in the 
This disambiguation page lists articles associated with the title Aperture value.