we have bought lenses for our Sharp NV6 projectors from Buhl Optical
(www.buhloptical.com) - they are top quality and they have a wide range of
lenses, but they can be pretty expensive.
cheers
russ
Keith Schneider wrote:
> > We would appreciate any experience for an zoon lens for LCD projector to use
> > for fMRI.
> > We need a zoom lens to InFocus LP930 or Philip ProScreeen PXG10, so the full
> > screen at 400 CM distance is at the size of 7 X 5 CM.
> > any information about the company to receive the custom order is
> > appreciated.
>
> We bought a lens of the proper focal length through the Edmund Scientific
> mail order catalog for about $80 or so and had our machine shop construct
> a focusable housing (two aluminum tubes that fit one inside the other,
> linked by a geared knob and a brass gear track) that could be attached to
> the LCD projector with its stock lens removed. A small diameter (10cm?)
> lens was fine--brightness wasn't an issue and in fact we might install an
> iris to dim the projector further.
>
> A single lens inverts the image, but this was fine because most
> projectors have controls to be able to flip the image in either direction.
>
> The result was a functional projection system that cost thousands of
> dollars less than an equivalent commercial lens, if you can even find what
> you need.
>
> Keith Schneider
> Center for Visual Sciences
> Univeristy of Rochester, NY
--
Russell A. Poldrack, Ph. D.
MGH-NMR Center
Building 149, 13th St.
Charlestown, MA 02129
Phone: 617-726-4060
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Web Page: http://www.nmr.mgh.harvard.edu/~poldrack
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