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Discussion Starter · #1 ·
I'm starting a new screen project this week. So far I have a piece of MDF that I had cut to 49" tall by 87 1/8" wide, this yields a 16:9 (1.77 screen). Now as I was sitting in the parking lot of lowes I figured if I added a 1.25" inch border all the way around the aspect ratio would stay at 1.77... right? wrong!


It occured to me later in a geometric epiphany that this would hold true only if the screen was square (1:1). So I basically just want to check my math before I do the final cut.


So if I take 49 - 2.5 (total vertical border), I get a result of 46.5 (inside dimension) Now, I take this number multiply it by 16/9 or approx 1.77, I get 82.66... add this to 2.5 (total horizontal border) I get 85.16...


So the _total_ width for my 16:9 screen, including border, should be 85.16 or about 85 1/8" -- right?


Thanks for any help.
 

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I just went over to the Stewart Filmscreen website and looked on their 16:9 aspect ratio chart for the Luxus Deluxe screenwall.


Some things I noticed:


They use 1.78:1 for 16:9, not 1.77:1. This might throw off your calculations.


On this particular screen, they have a 3.25" border. If you shoot for a 100" diagonal screen size in this format, your inside dimensions (without border) will be 49"H x 87"W. Your outside dimensions (with the 3.25" border) will be 55.5"H x 93.5"W.


This is a good guide to follow, or at least a good reference point to help you come up with another suitable size, based upon your border width.


I certainly hope this helps a little bit!


Victor
 

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Your math seems ok. I think 16:9 is more like 1.78:1, but aren't some films actually 1.85:1? In any case, you'll probably be doing some masking for different formats (especially 2.35:1). You might want to project some images (films) on a blank wall first before you cut the board down. You can always add border/masking but once the board is cut...


Randy D
 

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Discussion Starter · #5 ·
Thanks for the replies.


Just a note, when I do the calculations I actually store the result of 16/9 ( 1.77777777777777777777777777777778 ) in the calculator so I forgot to round when I posted.
 
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