sentences:  The ME F (and its ilk) could be expected to autofocus only under near-ideal conditions – brightly lit, high-contrast, well-centred and stationary subjects – that could be manually focused with ease.In more typical conditions, the ME F would focus imprecisely, or simply fail to focus.Instead, it might continuously but hopelessly turn its lens; "hunting" in vain for proper focus but succeeding in wasting limited battery power.