[SML] Masking Projector Black

[Stephen Litterst]

On 2/7/15 12:19 PM, Jason Salvatori via Stagecraft wrote:
>   I've always had issues trying this in the past.  The problem is that
> in front of the lens you are already past the focal plane, so you
> can't get a hard cut.  It is akin to using barn doors on a fresnel as
> opposed to a shutter on an ERS.   Having your blocking material a bit
> further in front of the lens does help a bit. I've also found that
> doing this will lower your output intensity of the rest of the image.
> What we need is someone to invent a projector with internal shutters
> that are DMX controlled... Jerry?

Actually, many DLP projectors can do this.  My Digital Projections' 
Titan unit has a menu option where I can bring in digital shutters from 
four sides.  It accomplishes this by turning off the micromirrors for 
the pixels that aren't desired.  Very effective.  I just wish they gave 
me DMX control of this parameter so I can change it easily during a show.

Steve L.


-- 
Stephen Litterst            Technical Operations Supervisor
litterst at udel.edu           Mitchell Hall
302/831-0601                University of Delaware