On Mon, 27 Mar 2000, 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
> various F stops.
There's a big problem with this, esp. for users of OMs with a
sub-mirror. The (simplified) way that LCDs work is like this: you have
a linear polariser and a space full of liquid crystal; when you apply
an electric field the liquid crystals all line up, forming another
linear polariser orthogonal to the fixed one, hence it goes dark.
Sub-mirror or not, you'd still lose a stop or so on account of this.
--
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