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Setuping Up Prisms/Distance

post #1 of 5
Thread Starter 
I was just curious how most of u you guys setup your prisms to figure out the distance and angles before you permantly mounted them when using a ceiling mounted projector? I have tried stacking a number of boxes up and placing the prisms on top of those boxes but the boxes aren't perfectly level causing some issues.

Would I be able to take down the projector and put it on a table at same distances from the screen and then setup the prisms or will the math/angle be slightly different?

As always you guys are a great help, and thanks in advanced.
post #2 of 5
A table top set up (directly beneath your ceiling setup) will be the easiest to align the prisms. If you change the TR, your final angles will also change.
post #3 of 5
Yeah, it is a PITA.

-Sean
post #4 of 5
Thread Starter 
is the distance between the two prisms always the same? I was planning on mounting them with pivoting points, is the distance between these two pivot points a constant? regardless of the throw ratio ?
post #5 of 5
Quote:
Originally Posted by ojuicy View Post

is the distance between the two prisms always the same? I was planning on mounting them with pivoting points, is the distance between these two pivot points a constant? regardless of the throw ratio ?

The prisms can physically touch if you want. Prisms do not have a focal length so the spacing can be what ever it needs to be so as not to vignette.
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