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BGSPCS
Joined: 23 Aug 2006 Posts: 115 Location: Pottstown, PA
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Link Posted: Thu Jan 31, 2019 5:45 pm Post subject: Barco lens calculator |
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Greetings!
I have a really silly and hopefully simple question about the Barco lens calculator program. When I make the calculation, is the “correction” value the distance above or below the top of the screen(in ceiling mount). After so many years of having my projectors sit on a rigged up table... I finally have a dedicated room the projector will live, thus going on the ceiling.
I recently got a 909, as an upgrade from the 1200x. 😃
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Brad S
Pottstown PA
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Hulio
Joined: 15 Apr 2006 Posts: 469 Location: Belgium
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Link Posted: Thu Jan 31, 2019 9:44 pm Post subject: |
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It depends. If the text message is in red and says "Watch out, you have a negative correction value", it means (for ceiling mounted projector) the top of the screen is lower than the mounting points.
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BGSPCS
Joined: 23 Aug 2006 Posts: 115 Location: Pottstown, PA
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Link Posted: Fri Feb 01, 2019 1:15 am Post subject: |
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Thanks for the reply! That is the case with my calculations for a 909 with HFQ900 lenses on a 110” 16:9 screen. It shows that message and a value of -8.8 for the correction value.
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Brad S
Pottstown PA
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kal Forum Administrator
Joined: 06 Mar 2006 Posts: 17860 Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
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Link Posted: Fri Feb 01, 2019 1:50 am Post subject: |
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I would ignore the calculator. The best height to install is exactly half way up the screen regardless of floor ceiling mount as it completely eliminates any trapezoid picture on the tube faces - it'll instead be completely rectangular which allows you to maximizes tube usage which in turn maximizes light output and wears the tubes slower.
Of course, nobody installs exactly half way up the screen. So if you're ceiling mounting, install as low as you can manage without having people hit their heads or block views. The good news is that it's typically right over the seating area so no bumped heads as you can't walk through the seats.
For best throw distance, use the method here: http://www.curtpalme.com/TubeCondition_PoorInstall.shtm
The above is true for any CRT projector. Not just your model or Barco.
Good luck!
Kal
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AnalogRocks Forum Moderator
Joined: 08 Mar 2006 Posts: 26690 Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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Link Posted: Fri Feb 01, 2019 6:20 am Post subject: |
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...or to add to what Kal said, half way up the screen. You can put it on a cart that shoots over your head when seated.
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BGSPCS
Joined: 23 Aug 2006 Posts: 115 Location: Pottstown, PA
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Link Posted: Sun Feb 03, 2019 4:17 am Post subject: |
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I could probably hang it lower, than the calculator says. It'll be interesting as my room has a 10' ceiling or so, and will hang from strut and 1/2" threaded rod. I can't put it on a cart as there isn't quite enough room in this room. Right now the projector will end up sitting nearly against the back wall to fill the 110" screen. So that will be interesting. I have the projector setup on a table to run through it before I put it on the ceiling. Thank's for the tips!
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Brad S
Pottstown PA
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kal Forum Administrator
Joined: 06 Mar 2006 Posts: 17860 Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
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BGSPCS
Joined: 23 Aug 2006 Posts: 115 Location: Pottstown, PA
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Link Posted: Wed Feb 06, 2019 6:51 pm Post subject: |
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Thank you! As things progress I’ll post photos.
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Brad S
Pottstown PA
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