Keep thinking, but not so loud...
Cotty wrote:
On 18/8/04, Steve Jolly, discombobulated, offered:
What about a transparent surface coated with some sort of reflective
material that changes its ability when presented with energy? So the
mirror reflects light to the finder, but when the shutter button is
pressed a charge is enabled to the reflective surface that stops it being
reflective and allows light to pass through to the sensor. Could do away
with the focal plane shutter at the same time. Exposure times of
100,000th second.
I want drawings of this SJ!
A kind of liquid crystals that changes its state (and light polarity) in
electrical field? But this time they should become reflective, not black as
usual. Who knows? Maybe it is already possible?
I was preparing a drawing of a device like this for Cotty when I
realised that anything that relies on polarisation effects (a) involves
throwing away half the incoming light (just like putting a polarising
filter over your lens) and is hence no better than a common or garden
pellicle mirror, and (b) prevents you from using polarising filters.
So, no liquid crystals I'm afraid. :-)
S
Okay, try this: a mirror that is sorta like a Venetian blind so it splits
into loads of parallel sections that swivel on exposure....
duh, just thinking out loud.....
Cheers,
Cotty
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