[photo-3d] R: Subject: Vivitar Series One 70-210 Anaglyph Zoom lens

["Sergio Baldissara" <winter@xxxxxxxxxx>]

I'm not familar with Q2 either, anyway here are some scans by a spanish
stereoscopist http://ttt.upv.es/~rmullor/Q2.html
and here http://sung3.ifsi.rm.cnr.it/~dargaud/Antarctica/Anaglyph.html
samples of the same job done with a modified telephoto lens.
The principles of this method are easy to understand: if you insert an
appropriated disturb into a lens, different wawelenghts of light may take
dfferent optical path and will focus in different points. Objects slightly
out of focus will have a double contour.
Althought everybody recommend the filter must be inside the lens, I
experienced a RC split filter in front of a lens (it must be a telephoto
lens at wide aperture, in order to get poor depth of field with most objects
out-of-focus) and got some 3d anglyph effects. Nothing exciting, so I gave
up.
Sergio

From: Peter Davis <pd@xxxxxxxxxxxxx>
Subject: Re: Vivitar Series One 70-210 Anaglyph Zoom lens

At 08:00 PM 5/9/00, deadman@xxxxxxxxxx wrote:
>Brought in a T60 remote cable to my local camera shop. (for my t-70's, to
>be spliced for twinning) He showed me a Vivitar Series One 70-210 Zoom
>lens (Nikon Mount) I once owned one years ago for my Canon AE-1,  but what
>made this one different was by pressing a switch, it converted into an
>Anaglyph lens.  Peering down the barrel, a red/green septum moved into
>place.  He claimed his former  store had dozens of them and that they sold
>off most of them for $99 each a few years ago. He had hung onto it even
>though he has no use for it himself.
>     Though I had never seen one, I am sure many in the group are familiar
> with them.  The question he asked me was: does anyone use these anymore
> and what  was it worth.   Any thoughts?          Richard, NY

This is the Vivitar Q-dos lens.  There's been a fair amount of discussion
of this in the past.  It is capable of taking some pretty effective analog
shots, but it has a few limitations:

1) You can't use colors that are close to the red/cyan of the
filters.  They will pulsate in the image.

2) You have to use a fairly large aperture, I believe, in order to maximize
the stereo effect.  This means a small depth-of-field, and a lot of
out-of-focus area.

That said, you can take some pretty good shots within those constraints,
and it's certainly easy to use.  Some folks on this list have made their
own by opening up a lens and inserting filters, but those are not
switchable.

Is he selling this one?  How much does he want for it?  How can I contact
him?





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