P3D zooms on projectors

[ron labbe <ron@xxxxxxxxxxxx>]

>>I can get a used pair from B&H in New York for $255 each, which
>includes a
>>zoom lens and a tray.  Is this a good price?
>

Greg W writes:
>Yes, it is a decent price.  In Usenet groups, used Ektagraphics are
>often offered for $300 or more.  However, I'd stay away from the zoom
>lens; for stereo applications, it will cause you no end of grief in
>trying to match image sizes, and if the barrel rotates like I think it
>does it will also throw your polarizers out of alignment.
>

I use ONLY zoom lenses ( I have two sets of four). If your fixed lenses are
not exactly matched, there is no way to get them to match. And they are
extremely limiting (one minus is that they're ususally not as bright as
fixed). You do need a nice set of target slides (I can provide). You can
either have internal polarizers (Bob Brackett makes a nice plug-in, also a
nice stand... I believe that Jon Golden sells them) or set up you
polarizers to rotate (I use polarizers that normally go on camera lenses~
they're made to rotate).


ron

ron labbe
studio 3d  30 glendale st maynard ma 01754
978 897-4221
mailto:ron@xxxxxxxxxxxx
http://www.studio3d.com


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