Nikon D3400 Reference Manual - English - Page 93

Focus Focus can be adjusted automatically (see below) or manually (0 81). The user can also select the focus point for automatic or manual focus (0 76) or use focus lock to focus to recompose photographs after focusing (0 79). Focus Mode The following focus modes can be selected during viewfinder photography: Option Description Camera automatically selects single-servo AF-A Auto-servo AF autofocus if subject is stationary, continuousservo autofocus if subject is moving. Shutter can only be released if camera is able to focus. For stationary subjects. Focus locks when AF-S Single-servo AF shutter-release button is pressed halfway. Shutter can only be released if camera is able to focus. For moving subjects. Camera focuses AF-C Continuousservo AF continuously while shutter-release button is pressed halfway. Shutter can only be released if camera is able to focus. MF Manual focus Focus manually (0 81). Note that AF-S and AF-C are available only in modes P, S, A, and M. More on Photography 69