In article , Alfred
Molon wrote:

In article , nospam says...
pentax's depth of field preview actually takes
a photo without writing it to the card and displays it. not exactly
live view, but it's not the traditional dof preview either.

Are you saying that for instance the Pentax K20D has no live video feed
to the LCD?

i haven't seen a k20d yet, but i was referring to how depth of field
preview is implemented. however, it looks like pentax does both
methods now, at least on the k10d. i'm pretty sure the *ist series
only did the digital preview.

http://www.dpreview.com/reviews/pentaxk10d/page5.asp

The K10D also provides a 'digital preview' option so that this lever
position instead takes a preview shot which is representative of the
final image in depth of field, white balance and exposure. This
'digital preview' image is shown on the LCD monitor but not saved.
This feature is also available when selecting white balance.