Re: Viewer lighting

["The Photo-3D List" <photo-3d@xxxxxxxxxxxxxxx>]

>  The first is that the illumination is not totally even. The
>bulb is centered from side to side, about 1/2" behind the
>diffuser and slightly below center vertically. I have a white
>reflector behind the bulb in an arc (sort of like my Red
>Button). The top and the bottom surfaces are also white. Still
>the left of the left eye is brighter than the left of the right
>eye, and so on. It's very noticable with no slide in place
>and somewhat noticable with a slide.

If you look through your red button Realist viewer carefully you will
notice that the same is happening there, i.e., the left side of the right
image and the right side of the left image (around the physical center of
the viewer where the bulb is located) is brighter than the ends.  This is
happening because the bulb is located at the center and the intensity of
the reflected light is higher at the center than the edges.  This can be
reduced if the entire light compartment is painted bright white or covered
with good reflective material.  Another way to reduce this problem is to
design the refector so that every point is in equal distance from the bulb.
This is not the case in any viewer I have seen.

I generally do not like the idea of two bulbs...

>  I know that lighting thru a diffuser like I am doing causes
>some problems versus how the red button does it (all reflected light)
>but I like my removable light box idea.

Can you build the viewer so you can remove the diffuser when you attach the
light box?

George Themelis


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