Dirk Wright wrote:
> > I was wondering about a Liquid Crystal Display used as a replacement
> > for the mechanical diaphram in lenses? My idea is that the lens would
> > have a LCD array of concentric circles embedded in a transparent lens
> > element, each set of circles turned off or on electrically to achieve
Christopher Biggs replied:
> An LCD that is inactive is not perfectly clear---there's the
> randomized crystals themselves and the grid circuits. I wonder if
> those objects would contribute a serious diffraction problem?
Even when "off" LCD displays are not completely opaque. I seem to
remember some high speed camera that uses LCD shutter, but it needs a
normal shutter (set to like 1/500s) to stop the film from being
unacceptably fogged: the normal shutter opens, the LCD shutter changes
state (opens/closes) then the normal shutter closes.
Vaughan
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