ðɛɹ ɪz ɐdˈɪʃənəl ʃˈʌɾɚ lˈæɡ dˈuː tə ðɪ ˈɛkstɹə klˈoʊs slˈæʃ ˈoʊpən æt ðə bɪɡˈɪnɪŋ ænd ðɪ ˈɛnd ʌvðɪ ɛkspˈoʊʒɚ sˈaɪkəl.
There is additional shutter lag due to the extra close/open at the beginning and the end of the exposure cycle.