[photo-3d] Re: Medium Format viewer

[Alan Lewis <3-d@xxxxxxxx>]

Niels wrote:

> You have helped me a lot. I tried a 80mm viewing lens with a
> 6x6 slide today.
> It was supposed to give me about the same view of a 50mm
> viewing lens for a 35mm slide. I don't know why (probably
> because of the square format), but the 6x6 slide image
> appears *a lot* bigger than the 35mm... and more vivid too.
> 

Yes, I have always believed through experience that when using an ortho
viewing lens a square format image will feel more immersive than a
rectangular image due to the extra vertical image area.  In the real
world we sense the "volume" of the scene by both the horiz. and the
vertical parts of the scene, along with the depth. 

If we follow this to the next logical step, the most efficient film
image shape is probably round, where you can eliminate the window of the
mount and use the full dia. of the viewing lens to view all parts of the
image.  It's a strange shape, but should seem more immersive.  
  
> I can't wait to build my MF viewer.
> 
> I've seen some blueprints that use the Edmund Scientific
> lenses... I wonder if I can get someone (like a glasses
> store) to make a similar lens for me...

If you have a friend in the glasses store business perhaps.  Otherwise
it is best to use commercially available achromatic lenses.  I've
already done the homework for the SaturnSlide lenses, they produce an
excellent image.

-- 
Alan Lewis  
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http://members.home.net/3-d
Serious viewers for Serious viewer's
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