I
need to work a little harder to focus the RX1 at night. The autofocus
system acquires the subject quickly and accurately as long as there's
enough contrast, as one would expect. As even lower light levels
plunge the subject into the deep shadows, the autofocus starts to
hunt. In this case, setting the flexible AF spot over an area of the
subject with a little more contrast normally allows the system to lock
on.
The
RX1 took longer than usual to focus on the woman above, but then
we're talking about light levels low enough to require a sensitivity
of 12,800. While my Panasonic GF2's autofocus feels a little quicker
at night, its sensor would have capitulated at anything beyond 1600.