Setuping Up Prisms/Distance - AVS Forum
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Old 09-16-2011, 05:15 PM - Thread Starter
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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.
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Old 09-16-2011, 07:44 PM
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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.

Mark Techer

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Old 09-16-2011, 09:11 PM
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Yeah, it is a PITA.

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Old 09-17-2011, 11:39 AM - Thread Starter
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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 ?
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Old 09-17-2011, 06:42 PM
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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.

Mark Techer

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