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crt display

 
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Joe Patino Jr



Joined: 29 Aug 2011
Posts: 17
Posted: Wed Feb 04, 2015 7:13 am    Post subject: crt display
Curt, or anybody that can answer this question. How far back must a crt. proj. be to be able to display an 120" dia. image? proj. either an Sony g90, or marquee 9500 ultra. joe P.
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CasetheCorvetteman



Joined: 09 Nov 2008
Posts: 6326
Location: Australia

Posted: Wed Feb 04, 2015 10:28 am    Post subject:
Around 4 meters. Let me check mine.
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Barco Cine 9, ,Sony VPL570ES 4K SXRD, 135" OZ Theatre Majestic 16:9 screen, Denon X6700in preamp mode, 2x 7ch Tonewinner amps, 2x Tonewinner 15" subs, 2x 10" subs, 7.2.6...

RUNCO DTV991 LC ( NEC XG 852 LC ) 100" 4:3 screen, H/K AVR 7.1...
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CasetheCorvetteman



Joined: 09 Nov 2008
Posts: 6326
Location: Australia

Posted: Wed Feb 04, 2015 10:30 am    Post subject:
Its closer to 3.6 meters with HFQ900 lenses.

Thats assuming a 16:9 screen, 4:3 will need to be a bit further back. Say between those two figures.
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Barco Cine 9, ,Sony VPL570ES 4K SXRD, 135" OZ Theatre Majestic 16:9 screen, Denon X6700in preamp mode, 2x 7ch Tonewinner amps, 2x Tonewinner 15" subs, 2x 10" subs, 7.2.6...

RUNCO DTV991 LC ( NEC XG 852 LC ) 100" 4:3 screen, H/K AVR 7.1...
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Curt Palme
CRT Tech


Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC

TV/Projector: All of them!
Posted: Thu Feb 05, 2015 3:22 pm    Post subject:
Typically 1.35 X the width of the screen, regardless of aspect ratio used.
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cmjohnson



Joined: 03 Apr 2006
Posts: 5180
Location: Buried under G90s

Posted: Sun Feb 08, 2015 11:26 pm    Post subject:
My 9500LC is almost exactly 120 inches from screen to center of center lens, as measured across the floor, so given the slight angle of the projection, actual path of travel from the center of the green lens to the center of the screen will be a little bit longer than that, maybe one extra foot at most. This is for an 8 foot wide screen.

Lens type is HD10GT17. Rasters are well maximized without any fold-back.
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CasetheCorvetteman



Joined: 09 Nov 2008
Posts: 6326
Location: Australia

Posted: Mon Feb 09, 2015 1:41 am    Post subject:
Curt Palme wrote:
Typically 1.35 X the width of the screen, regardless of aspect ratio used.

Dont you widen the raster for 16:9?
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Barco Cine 9, ,Sony VPL570ES 4K SXRD, 135" OZ Theatre Majestic 16:9 screen, Denon X6700in preamp mode, 2x 7ch Tonewinner amps, 2x Tonewinner 15" subs, 2x 10" subs, 7.2.6...

RUNCO DTV991 LC ( NEC XG 852 LC ) 100" 4:3 screen, H/K AVR 7.1...
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