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AVphile
Joined: 02 Dec 2008
Posts: 334
Location: Ottawa, Ontario
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| Posted: Sat Nov 21, 2009 6:51 pm Post subject: |
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My ceiling is 8'8" and the PJ is suspended by 9" threaded rods. I did not want to drop it more than that, but I find the resultant screen height too high. You have to look UP to watch the movie! I used Barco LENS program recommendations for 16:9 screen.
How much vertical raster shift (down) is safe to use without royally messing up the geometry? I got a new screen today so I need to redo size and geometry anyway, and I'd like to mount the screen lower this time if possible.
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AVStefan
Old setup: HDFury3 -> BG-808s -> HD-145
New setup: JVC D-ILA -> Stewart StudioTek 130 G4
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garyfritz
Joined: 08 Apr 2006
Posts: 12088
Location: Fort Collins, CO
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| Posted: Sat Nov 21, 2009 6:58 pm Post subject: |
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| brenwaterys wrote: | | The ceiling in my basement is 6'8" ... but being that I am 6'10" tall this makes for interesting seating. ... it still can be somewhat of a pain having to crouch down to work on the projector. |
Damn, you have to crouch down just to walk around in the basement!!
That's how it was in the house I grew up in. Old Iowa farmhouse with unfinished basement, stone basement walls, etc. That was no big deal when it was just a dank hole, and besides I was short then. Then my parents finished off part of it and squeezed a 7' pool table between the wall and the monster oilburner furnace. I think the ceiling ended up being about 6' - 6'2" or so, and I'm 6'4". That wasn't too bad when playing pool -- the furnace 20" from the pool table was a much bigger challenge!! -- but it was much more of a "headache" when we put a ping-pong surface on top of the pool table! 
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zaphod
Joined: 16 Jun 2006
Posts: 2002
Location: Cloverdale
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| Posted: Sat Nov 21, 2009 7:38 pm Post subject: |
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| AVphile wrote: | My ceiling is 8'8" and the PJ is suspended by 9" threaded rods. I did not want to drop it more than that, but I find the resultant screen height too high. You have to look UP to watch the movie! I used Barco LENS program recommendations for 16:9 screen.
How much vertical raster shift (down) is safe to use without royally messing up the geometry? I got a new screen today so I need to redo size and geometry anyway, and I'd like to mount the screen lower this time if possible. |
i'm not familiar with the barco as much as the NEC, but could you not tilt the barco down and then adjust the image with keystone? point focus would be required too i guess.
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jask
Joined: 17 Mar 2006
Posts: 10187
Location: kamloops BC
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| Posted: Sat Nov 21, 2009 9:56 pm Post subject: |
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| dturco wrote: | Funny how things jogg the memory. Back when I was selling houses in Phila ,I sold one that had ceilings that were 6'8" throughout the home. The story went the man who owned it, and built it himself, felt since that was as high as he could reach with the hammer, that was all the taller the ceilings need to be.
And he did own it till he died, it was an estate sale. 
The home was a catalog order home from Sears & Roebuck, and the catalog was displayed on the kitchen counter for validation. 
Now that was an independent thinking man  |
I bet he was mad when the lumber yard would not sell him undersize materials 
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AVphile
Joined: 02 Dec 2008
Posts: 334
Location: Ottawa, Ontario
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| Posted: Sat Nov 21, 2009 11:13 pm Post subject: |
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| zaphod wrote: | | AVphile wrote: | My ceiling is 8'8" and the PJ is suspended by 9" threaded rods. I did not want to drop it more than that, but I find the resultant screen height too high. You have to look UP to watch the movie! I used Barco LENS program recommendations for 16:9 screen.
How much vertical raster shift (down) is safe to use without royally messing up the geometry? I got a new screen today so I need to redo size and geometry anyway, and I'd like to mount the screen lower this time if possible. |
i'm not familiar with the barco as much as the NEC, but could you not tilt the barco down and then adjust the image with keystone? point focus would be required too i guess. |
Sure, if that's preferable. I was wondering if there was a rule of thumb like, don't exceed 80 on a scale of 0-100 for vertical shift (with 50 being the nominal setting). It would be nice to know this before doing a full geometry setup and convergence only to find something is maxed out.
They say the PJ should be level, but if there's 16:9 tube wear then I guess the tilt method might be the only option.
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garyfritz
Joined: 08 Apr 2006
Posts: 12088
Location: Fort Collins, CO
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| Posted: Sat Nov 21, 2009 11:26 pm Post subject: |
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Point focus won't help if you tilt the projector. You need Scheimpflug for that.
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Mr. Green
Joined: 23 Feb 2007
Posts: 1394
Location: Calgary
TV/Projector: Marquee 9501LC / NEC 9PG+
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| Posted: Sun Nov 22, 2009 1:32 am Post subject: |
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| jask wrote: |
as long as you can roll in full length trimmers, it is just like framing a stair opening, no problems!! |
A stair opening with a projector and FRIDGE on it!!!! Exactly the same...
If it falls on you, don't think that get's you out of coming to town for some home brew. 
_________________
You can be young only once but, you can be immature forever.
Current Projector Marquee9501LC with PS3 (BLu-Ray) at 1080P LOVE IT! Screen is an Elunevision 120" 4:3 (2.4 gain - no hotspots). (also own a NEC 9PG+)
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Mr. Green
Joined: 23 Feb 2007
Posts: 1394
Location: Calgary
TV/Projector: Marquee 9501LC / NEC 9PG+
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| Posted: Sun Nov 22, 2009 1:39 am Post subject: |
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Oh, my ceiling is 12 feet. My basement is useless for a theatre. I'm using Chief mounts to lower it. Still gotta watch your head though. It's at about 6 feet. because we want the screen lower without having to crane our necks to "look up"
_________________
You can be young only once but, you can be immature forever.
Current Projector Marquee9501LC with PS3 (BLu-Ray) at 1080P LOVE IT! Screen is an Elunevision 120" 4:3 (2.4 gain - no hotspots). (also own a NEC 9PG+)
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jask
Joined: 17 Mar 2006
Posts: 10187
Location: kamloops BC
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| Posted: Sun Nov 22, 2009 6:32 am Post subject: |
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| Mr. Green wrote: | | jask wrote: |
as long as you can roll in full length trimmers, it is just like framing a stair opening, no problems!! |
A stair opening with a projector and FRIDGE on it!!!! Exactly the same...
If it falls on you, don't think that get's you out of coming to town for some home brew. |
funny you should mention homebrew...I was just talking to a fellow about a vintage 2 door 2 tower kegerator he is pulling out of a private club should look good in my basement. Just tapped my latest stout and it is awesome...I planning to have it for Christmas company but I doubt it will last 
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