Re: SLR?
- From: Chemiker <prussianblue28@xxxxxxxxxxx>
- Date: Fri, 17 Jun 2011 20:39:25 -0500
On Fri, 17 Jun 2011 23:30:02 GMT, Matti Vuori <xmvuori@xxxxxxxxxxx>
wrote:
Chemiker <prussianblue28@xxxxxxxxxxx> wrote in
news:m2fnv6p8h3ebhomvsa51bn12b51pa287vj@xxxxxxx:
Further: The reflex design should be compared to the so-called
"rangefinder" cameras, in which the photographer appears to be viewing
the subject directly (actually, in a true RF, there are 2 images, one
viewed direcitly and the other reflected from a separate lens
system.)
No, it should not. There are many viewfinder systems that do not utilise
the lens used for shooting. The rangefinder is just one of them.
I know that. In the classic RF like the Leica M3, the shooting lens is
not part of the RF optics. My RB67's also have a "sport" finder, which
is little more than a framing device. One is also built into my
Yashica D TLR, that completely bypasses the viewing optics. However,
these finders do not support focusing at all. Just framing. The old
Graphic press cameras (and my long defunct Mamiya Press) also had such
a "wire-frame" finder, and you had to set up the lens focus manually,
converting the camera into a Brownie Box Camera. I was pointing out
that the term "reflex" simply means that a mirror is part of the
viewing/composing/focusing optics. I guess you could also call the old
Kodak Tourist 120 a sort of reflex, as the user set the distance
manually on the lens, and framed using a tiny glass finder, separately
mounted on the front standard. The whole point is that the
viewing/composing optic system in a "reflex" camera uses a mirror,
which may or may not be part of the shooting optics, while non-reflex
cameras do not. (I am ignoring the use of beam-splitters as part of
the range finder.)
The relationship between the TLR and the SLR is clear. The SLR is
derived from the TLR design, modified to eliminate the parallax
problem. You may recall that the early Leica RF's used top-mounted
finders that allowed for more accurate framing with multiple lenses.
These were not for focusing though.
Having said all that, I have a feeling I missed your point. Was it
that all reflex cameras use a ground glass focusing screen upon which
the image is reflected? (As opposed, for example, to the view camera,
in which the viewing lens is the shooting lens, but still uses a
ground glass screen for focusing?
If I did miss your point, I'm sorry.
Alex
.
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