Sounds nicely portable, planning on buying a surplus Russian Aircraft
Carrier?
Joseph McAllister wrote:
You are probably correct. It's too slow these days. Maybe if we hit it
with 1200 volts @ 40 amps it would work. :-)
I was waiting for someone to argue my "10,000" mph was incorrect for
for focal plane shutter velocity. It probably is.
By the way, when I worked in a gov't lab in the late 70s and through
the 80's that exposed film with a signal from 3 satellites (KH-11) we
used a "Laser Image Reconstructor" (LIR) that was basically a 12 ton
laser printer (5 watt laser) where the beam intensity was controlled
by a block of some sort of crystal that modulated the beam between
opaque and sorta clear fast enough to paint lines (2183 per inch) on
film being pulled through the machine at a few inches per second with
a 48 facet air bearing'd spinner polished and silverd quartz crystal
at 24,000 rpm, each facet drawing a line across the film. Now that's
fast reaction time for a crystal modulator. And I do not remember what
the electrical specs were for that crystal modulator. I imagine quite
high bias voltage & moderate current. The driver transistors (about
twice the size of a 3055) occupied a 18" & 24" aluminum board
immersed in circulating triple-distilled water fed by a 250 gallon
refrigerated tank.
On May 22, 2009, at 12:45 , P. J. Alling wrote:
There's a noticeable lag in windows made that way. (Maybe there's
been a speed improvement since the last time I saw one of them
demonstrated).
Joseph McAllister wrote:
Maybe some day they'll figure out how to get light to travel faster,
or conversely get shutter curtains to zip across the focal plain
faster than 10,000 miles per hour. I'm opting for an optical glass
shutter that blocks light completely until hit with a current at
which time it becomes utterly transparent until the current is
removed. Could even be combined with the low-pass filter glass.
No fee for the idea, but I'd be glad to help with the science,
Pentax....
Joe
On May 22, 2009, at 07:35 , William Robb wrote:
----- Original Message -----
From: "Adam Maas"
Subject: Re: Oh another K-7 thread...
Define the old days ;-)
My FM2n and FE2 (both circa 1983) and my F801s (circa 1991) all have
1/250 sync.
Heck, my old Nikkormat FTn, which dated from the late 1960s had a
1/125
second sync speed.
William Robb
If it doesn’t excite you,
This thing that you see,
Why in the world,
Would it excite me?
—Jay Maisel
Joseph McAllister
pentax...@mac.com
--
PDML Pentax-Discuss Mail List
PDML@pdml.net
http://pdml.net/mailman/listinfo/pdml_pdml.net
to UNSUBSCRIBE from the PDML, please visit the link directly above and
follow the directions.
--
--
The free man owns himself. He can damage himself with either eating or
drinking; he can ruin himself with gambling. If he does he is certainly a damn
fool, and he might possibly be a damned soul; but if he may not, he is not a
free man any more than a dog.
--G. K. Chesterton
--
PDML Pentax-Discuss Mail List
PDML@pdml.net
http://pdml.net/mailman/listinfo/pdml_pdml.net
to UNSUBSCRIBE from the PDML, please visit the link directly above and follow
the directions.
