It might not be totally at random, but it sure feels like it, when you
press the shutter button half-way down about 30 times, all while pointed
at the same subject in dim light, and the AF-assist lamp only comes on 2
or 3 times. My lens would agonizingly hunt for extended periods of time
and ultimately fail to find focus--except for those few times the
AF-assist light came on. Whenever the light came on, focus was always
prompt and accurate. If Pentax provided more user control over the
light, or simply programmed it to come on whenever the AF fails,
everything would be fine.
On 3/29/2014 4:24 PM, John wrote:
So, it's not entirely "at random", but there doesn't seem to be any user
control other than to turn the function on/off.
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