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Discussion Starter · #1 ·
I have a bulkhead (soffit) between my projector and screen. I want to put the projector as high as possible.


Which is the correct drop distance to install the projector? Option 1, 2, or 3?:







(Image features exaggerated for effect)


I'm assuming with digital projectors it's option 1? (Because it's the entire lens that forms the image). Correct?


The projector in question will be a JVC RS45 or RS55.


Thanks!


Kal
 

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Generally, the top of the lens because the lens is indented and the light scatters/spreads fairly immediately, but lens shift is going to move it a little, so it will depend on the angle as well as the distance from the lens to the bulkhead.


The way you figure this out is to use the formula below that I posted:
http://www.avsforum.com/t/1375094/official-jvc-x30-rs45-owners-thread/3240#post_21863092


Just measure the distance from the bulkhead to the projector lens, and use that formula to calculate the inches instead of feet (you'll just make a small adjustment to it).

Then you will know about how far it needs to clear it.
 

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Discussion Starter · #3 ·
I figured that the entire lens was used but thought I'd check anyway.


The formula makes a lot of sense. I ended up pulling a string and using a laser pointer to double check too. I need a 6" drop minimum for my given throw.


The mount's been ordered:


Chief RPMA281 (which includes the SLB281 plate to fit a RS45 or RS55)

Chief CMA101 "designer" ceiling plate

Chief CMS003 3" pipe (1.5" NPT)


All combined the drop's slightly more than 6".


Thanks for the help!


Kal
 
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