The lens can be pre-focused but does not move into position until the shutter button is fully depressed.
ðə lˈɛnz kæn biː pɹˈiːfˈoʊkəst bˌʌt dʌznˌɑːt mˈuːv ˌɪntʊ pəzˈɪʃən ʌntˈɪl ðə ʃˈʌɾɚ bˈʌʔn̩ ɪz fˈʊli dᵻpɹˈɛst.