P3D Re: Transposed and pseudo

[Dylan The Hippy Wabbit <spacey@xxxxxxxxxxxxx>]

Hi,

Mark Shields wrote:-

>If anybody would like to offer a concise explanation of why Nimslo
>and beamsplitter shots are different in this way, I would like to
>hear it. I did try to locate an old beamsplitter viewer that I had
>to look inside it, but can't put my hands on it just now.

Would it be a matter of one lens versus two?  Remember that the camera
lens projects an inverted and reversed image on the film.  An SLR looking
through a beamsplitter reverses the two images as a pair, where the
converted Nimslo projects two separate images.

I'll try to do an ASCII sketch of the plan view:-


                                       L    R
SUBJECT        L------R               L--R L--R   (as seen through
               |\    /|               |       |    splitter)
               | \  / |               |       |
               |  \/  |               |       |
               |__/\ _|               |_______|
LENS           /  \ /  \ (short       /       \
               \__/ \__/ fl huh?)     \_______/
                \/   \/                \     /
                /\   /\                 \   /
               /  \ /  \                 \ /
IMAGE          R--L R--L                  X
                 L    R                  / \
                                        /   \
                                       /     \
                                      R--L R--L   
                                       R    L


Clear as mud!


>   |\      _,,,---,,_
>   /,`.-'`'    -.  ;-;;,_
>  |,4-  ) )-,_..;\ (  `'-'
> '---''(_/--'  `-'\_)

I *love* that cat, BTW.

Dave Spacey

______________________________________________________________________________

Walk tall, walk straight,
Spit the world right in the eye.

-Kevin Godley and Lol Creme


------------------------------