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Old May 6th 04, 04:05 AM
Bob Monaghan
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Default swing lens cameras and focussing distance


the evidence that the horizon 202 is focused at 7 meters is very simple;
it is virtually identical to the noblex 135 series in format/coverage,
which we know per mfger's specs is focused at 7.5 meters. If you compare
the noblex 135 DOF for various f/stops against matching horizon 202 DOF,
you get nearly identical values - if anything, the horizon is slightly
closer, meaning its focusing point is less than 7.5m at same stops etc.

so if the noblex 135 is focused at 7.5m, the horizon 202 has to be focused
at about 7.5m as well, given similar DOF values, lenses, and film formats.

Again, you can't use the fixed lens DOF calculator with the fixed 28mm
lens and apply it to the swing lens case with a different film format and
much wider coverage on the larger film format etc., even if you do modify
CoC. That's why your answer for fixed 28mm lens doesn't match case of
noblex 135, which has similar specs, swinging lens, and format and
coverage. It is just a happy coincidence (or more russian copying?) that
the horizon 202 matches the Noblex 135 so closely...

in short, the horizon 202 is nearly identical to the Noblex 135 in DOF vs.
f/stop charts, format, swing lens type, etc., so it must be focused at the
same point, viz., 7.5 meters or so, not infinity.

bobm


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