> Dean Tyler <dtyler@xxxxxxxxxxxxxx> wrote:
>
>
> Here is a review of the new Epson RD-1 for the M mount folks if you
> haven't
> seen it:
>
I like this section (extracted from the article):
+++++++++++
Then there?s the issue of viewing depth of field. An SLR normally uses an
automatic
aperture that remains open during composition and only closes to its set
aperture at
the moment of exposure. So, let?s say the camera has a 50mm F/1.8 lens mounted
and set to an aperture of F/8. The exposure will be made at F/8 of course but
the
viewing used to compose and choose the moment of the picture will be seen
through
the lens wide open. That means that one will only see a certain range of
distance in
the frame (usually the foreground subject) clearly, everything behind and ahead
of that
focus zone will be blurred. So while the film or sensor will ?see? at F/8 when
the
exposure is made, the photographer sees at F/1.8. It?s hard for one to make a
picture
he or she can?t fully see. One can get around this using a depth of field
preview button
but that method tends to work better when the camera is on a tripod. When
working
handheld, using a DOF preview button can be cumbersome and makes for a dark
finder where things are harder to see. The rangefinder has the opposite problem
of
showing all distances from the lens in focus. One process is additive and one
is
subtractive. With the SLR, one must see certain distances out of focus and
imagine
what they will look like in focus. With a rangefinder, one sees all distances
in focus
and must imagine what some of them will look like out of focus. I prefer the
latter way
of working.
------------
Wayne Harridge
http://lrh.structuregraphs.com
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