On Mon, 29 Jun 2009 13:44:41 +0100, "whisky-dave"
wrote:


"Eric Stevens" wrote in message
.. .
On Fri, 26 Jun 2009 13:28:58 +0100, "whisky-dave"
wrote:




Do you honestly think that any automatic focusing system in the world is
ever going to be smart enough to figure out if you want the leading edge
of
that small-butterfly's wing, the antennae, or the further wing edges in
precise focus?

Yes in a manor of speaking. The new Apple iPhone, when used as a camera
you touch the screen to select what you want the camera to focus on.

Some Nikon [e.g. D300] cameras allow you to select the point of the
image you wish to focus on.

How do they do that, or how it is achived. ?

See
http://www.digitalreview.ca/content/...mera-Pg2.shtml

Under the heading of 'Auto-area AF' you will see an animation of a
single focus point leaping around the view finder window. In fact it
doesn't leap: you move it around with the multi-control button which
acts as a set of cursor keys. You can work the button with your right
thumb while peering through the view finder.



Eric Stevens