[MF3D.FORUM:141] Re: Light for viewer question

[Tom Hubin <thubin@xxxxxxxxx>]

Tloc54452@xxxxxxx wrote:
> 
> In a message dated 2000/02/03 00:59:35, thubin@xxxxxxxxx writes:
> 
> >One alternative is to line up several LEDs horizontally. This will
> >produce an image of a line of LEDs. Location of the eye anywhere on the
> >line will intercept one or more LEDs. Image brightness will be
> >proportionate to the number of LEDs imaged into your eye. To me that
> >means that small images are desirable. This is accomplished by using
> >LEDs with small viewing angles and a long focal length lens. This will
> >produce a small image of each LED.
> 
> How about using crossed cylindrical lenses?  Then you keep your vertical
> spread low and your horizontal spread higher.
> 
> John B

Hello John,

I am not sure what you mean by crossed cylinders. 

You could probably use a sphere to begin with. If the single LED per eye
is too much light and you want to spread the LED image out horizontally
then you could use a weak negative or positive cylinder, stacked close
to the sphere, to do that. 

If the single LED per eye is not enough light or just enough light then
you should not spread it out. You should add more LEDs horizontally.

I have yet to hear anybody complain that a viewer is too bright. I don't
think I have even heard anybody on this list say that they don't want
more light. Still, there is a first time for everything.

Tom Hubin
thubin@xxxxxxxxx