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Discussion Starter · #1 ·
I am purchasing a 132"W x 99"H (4:3) Stewart GrayHawk screen for my G20. I understand the DILA projectors have some "overspill". How much masking should I add to block this? I was thinking about 18" on top (for positioning), 6" on the sides, and 4" on the bottom. I am also going to use a Panamorph, and am working on dropping a horizontal mask from the top and raising one from the bottom (if raising the screen impairs flatness too much). Any suggestions on where I might purchase motorized masks?


Thanks -- Bobf>
 

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Bob, I have just compleated a G-20 installation with masking. I live an hour-and-a-half South of you. If you would like to see what can be done, send me an e-mail. (132" wide screen)
 

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I have 7" left/right/bottom and 12" top masking on my 107x60 GrayHawk and it really improves the viewing experience when you have the halo completely masked. I didn't want the stray light spilling over onto the wall. 7" is more than enough for my screen size, but I wanted to account for the inward curving sides used with the tab-tensioning and have some reserve as well.


------------------

Randy

G20/CI/GrayHawk
 

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Discussion Starter · #5 ·
Sounds like 7" is working for your screen. Can you tell how close the halo is to the edge of your mask? My screen is 25% wider and my mask is an inch smaller, so do you think I will be okay, or do I need to increase the mask a bit? My installation is a bit cramped, so I'm trying to make it as small as possible.s>f>
 

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Discussion Starter · #6 ·
From randmac via email: I projected a 107†wide image onto the wall, then walked up and measured the halo at about 4â€. Then when I was visiting Stewart’s factory, I asked Don Stewart how much masking I should specify to ensure the minimum masking width was 4†for the curved edge of the tensioned screen. He said 6†should do it. I then add 1†for reserve and to account for overscanning the image a little


Unfortunately, I cannot setup my projector yet, but extrapolating 107" to 132" implies ~5" of halo. Assuming the Stewart screens are always 2" narrower in the center than at the top and bottom, I think 7" of masking will be enough (no reserve for me). Thanks for all the help guys!
 

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One thing you want to be careful about is that on the Stewart drawings the side panel's width is measured at the batten at the bottom of the screen. On a tab tensioned screen there will be significantly less black area on the sides as you move up the height of the screen. To avoid any surprises I would recommend you verifiy with the factory the exact side cut. Stewart's screen calculating software that you or your installer may be using does not give this level of detail.
 
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