At 06:10 PM 9/17/2002 -0700, Tim Chakravorty wrote:
...
Again , its important that for best quality you shoot from a sturdy
tripod. Here is an extract from John B. Williams's
'Image Clarity' pg 191.
"
....handholding is strictly for dead photographers: a human pulse beat
will cause 200 microns (about 0.008 inch) displacement for
1/10th second. Assuming a shutter speed of 1/250th sec., this movement
alone will cause a 220ss of resolution with a system that
is otherwise capable of reproducing 100 lines-per-mm (lpm). And at a
shutter speed of 1/125th sec., this performance would degrade
to only 53 lpm-a 47% waste of what you purchased ....
...
This almost makes sense, except that: the camera isn't sitting on your vein
and get affected by the "pulse modulation" :-) directly. i.e. can you (or
J Williams) prove that a camera move anywhere close to 200 microns in
1/10th while being handheld due to the pulse? It probably moves that much
or more (?) simply because the camera holder has slightly shaky hands and
has nothing to do w/ pulse!
But of course if he or she is dead, then yes, that won't be any camera
movement per se.
// richard <http://www.imagecraft.com>. We had a server CRASH :-( Please
rejoin ImageCraft mailing lists <http://www.dragonsgate.net/mailman/listinfo>
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