I have a related question, if I may. I was thinking about purchasing this projector when I looked at NEC's distance calculator and noticed the large offset. I would like to mount the projector to an 86" basement ceiling, but that would put the bottom of an 80"x45" screen less than two feet from the floor. Reducing the screen size doesn't help much. So my question is, how does the Keystone correction affect PQ? Some have suggested I avoid this projector partly because of the offset. I suppose I could always jack up the house . . .
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Ques for HT1000 owners- Keystone/3d reform
does anyone use the keystoning features on this pj often?
i was just wondering how much the 3d reform will degrade the picture if i move the pj a little more to the side.
it would be nice to reclaim the sweet spot again and i may give up a little bit in pq to do it (ceiling mounting isn't an option).
what exactly should i be expecting as far as image degradation? would i be seeing scaling artifacts or more pixilation?
i was just wondering how much the 3d reform will degrade the picture if i move the pj a little more to the side.
it would be nice to reclaim the sweet spot again and i may give up a little bit in pq to do it (ceiling mounting isn't an option).
what exactly should i be expecting as far as image degradation? would i be seeing scaling artifacts or more pixilation?
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I do not use any 3D reform for keystone adjustment, but I have played around with the adjustments.
I noticed have not noticed any image quality issues when using the 3D reform or keystone. What you will notice if you put up a grid, is how the geometry jumps around just a bit. If you watch a vertical line on the edge of the screen while making a side keystone adjustment, the line might appear to bend slightly and then straighten out as you click thru the adjustments. It appears as though the scaler and 3D reform are working together to always provide a clean image, at the expense of very small geometric distortion within the image field. And when I say small, it's something you would never notice unless you are looking at a complex grid pattern.
Bottomline, the 3D Reform and Keystone on the HT1000 is very solid.
I noticed have not noticed any image quality issues when using the 3D reform or keystone. What you will notice if you put up a grid, is how the geometry jumps around just a bit. If you watch a vertical line on the edge of the screen while making a side keystone adjustment, the line might appear to bend slightly and then straighten out as you click thru the adjustments. It appears as though the scaler and 3D reform are working together to always provide a clean image, at the expense of very small geometric distortion within the image field. And when I say small, it's something you would never notice unless you are looking at a complex grid pattern.
Bottomline, the 3D Reform and Keystone on the HT1000 is very solid.
sounds good, thanks!
looks like i will definitely give that a shot.
Grampa, it sounds like, as long as the keystone reform works well, if you could find a way to mount the pj at a slight upward angle, and use the reform feature, you would be able to get around this pjs problematic offset.
looks like i will definitely give that a shot.
Grampa, it sounds like, as long as the keystone reform works well, if you could find a way to mount the pj at a slight upward angle, and use the reform feature, you would be able to get around this pjs problematic offset.
Yes, it looks that way. Any others out there have experience with the HT1000 and a low ceiling?
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Yes. My installation (8' ceiling, 12' throw) requires 2 clicks of keystone korrection. I know I'm theoretically losing a little resolution in the blanked out areas but the rescaling looks very very good to my eye. I've only owned 1 other projector with digital keystone correction (XP21N) and the correction on the HT1000 is leagues better than that.
| Originally posted by Grampa Yes, it looks that way. Any others out there have experience with the HT1000 and a low ceiling? |
I use a slight bit of keystone and I can't tell the difference with moving video material. I can see it with computer text but not video.
-Dylan
-Dylan
PRH....So regarding your ceiling mount, are you slightly angling the HT1000 up toward the ceiling a bit, then still having to keystone to square the picture? And this still looks good? I'm about to pull the trigger on one, but I am nervous with this offset issue. I want to use the Peerless ceiling mounting braket that is already in my ceiling which held my old LT150 and just get a new plate to fit the ht1000. My ceiling is also 8' with an 11' throw to a 100" 4:3 pull down screen. Validation is very welcome! I think I'd be pretty bummed out if I finally got this pj, but it didn't work for my configuration!
Thanks
Thanks
Because the front of my theater room is narrower and the back of the room wider, I have to situate the HT1K slightly offcenter, which requires a little 3D reform adjustment. I can honestly say I don't see any keystone adj artifacts. Picture is beautiful.
Tilted table mount, 3 clicks on keystone, no detectable effect!! This is not a deal breaker by any means.
I have a ceiling height of around 7ft, and project the 16:9 image onto the (16:9) screen, the top of which is 18ins from the ceiling. My ceiling mount is aprox 6ins long. I could slide the image up further to approx 14ins if I wanted. 12 ins is possible if you zoom fully in - zooming out (making image bigger) drops the image a little.
HTH
Gary.
HTH
Gary.
You guys worried about tilting up the projector to fill your screen. I hv 8ft ceilings and when using a 4.3 screen I do tilt the pj up a little, then using the 3D reform to square up the image. The adjusments are small and you can't see any problems, the image looks perfect corner to corner.
If you use a 16.9 screen you hv the option of moving the 16.9 image up or down within what would hv been the projected 4.3 image.
The HT1000 is more flexible than you think.
If you use a 16.9 screen you hv the option of moving the 16.9 image up or down within what would hv been the projected 4.3 image.
The HT1000 is more flexible than you think.
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Yes, yes and yes. I was in the same boat as you back in January. I asked around about this same issue before buying, then pulled the trigger. The offset has not proved to be much of an issue whatsoever.
| Originally posted by LenVP PRH....So regarding your ceiling mount, are you slightly angling the HT1000 up toward the ceiling a bit, then still having to keystone to square the picture? And this still looks good? I'm about to pull the trigger on one, but I am nervous with this offset issue. |
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Gary, you don't give the size of your screen or say whether you are using the keystone correction feature. According to NEC's calculator, an 80" wide 16:9 image has a drop of 42" to its center. A 6" mount would put the top of this image 18" below the ceiling, assuming you position the image at the top of the projector's 4:3 frame. The bottom of the image would be 63" from the ceiling, or just 21" from the floor (assuming a ceiling height of 84").
When I imagine this configuration in my space, it feels a bit low. Is there an ideal screen height for viewing? For example, should the center of the screen be at eye level when sitting?
From the comments in this thread, it appears that a low ceiling height should not deter me from purchasing the HT-1000, if that is the projector I want. Perhaps the thing to do is to buy the projector and play with it before committing to a particular screen.
Doug
| Originally posted by Gary Lightfoot I have a ceiling height of around 7ft, and project the 16:9 image onto the (16:9) screen, the top of which is 18ins from the ceiling. My ceiling mount is aprox 6ins long. I could slide the image up further to approx 14ins if I wanted. 12 ins is possible if you zoom fully in - zooming out (making image bigger) drops the image a little. HTH Gary. |
When I imagine this configuration in my space, it feels a bit low. Is there an ideal screen height for viewing? For example, should the center of the screen be at eye level when sitting?
From the comments in this thread, it appears that a low ceiling height should not deter me from purchasing the HT-1000, if that is the projector I want. Perhaps the thing to do is to buy the projector and play with it before committing to a particular screen.
Doug
"Is there an ideal screen height for viewing?"
Recommended view is 1/3 up from the bottom of the screen.
Recommended view is 1/3 up from the bottom of the screen.
Hi Grampa,
Sorry that I left out some details. My screen is 84" wide by 47.25" high - there are a few pics on my home page if you're interested, and you can get a good idea of my screen and ceiling height.
I also made an error - my mount is 3.5 ins long (6.75" to lens center), and the screen is actualy a little over 19" from the ceiling, but I still have plenty of room to slide the 16:9 image up a few inches. I'm not using any keystone or digital correction at all. The zoom makes a difference as I previously mentioned.
As Tom says, have your eye level up around a third of the distance from the bottom of the screen. I prefer to look down than up at my screen, so I could comfortably sit with my eyes half way up the screen. To look up too much can cause neck ache after a while.
HTH
Gary.
Sorry that I left out some details. My screen is 84" wide by 47.25" high - there are a few pics on my home page if you're interested, and you can get a good idea of my screen and ceiling height.
I also made an error - my mount is 3.5 ins long (6.75" to lens center), and the screen is actualy a little over 19" from the ceiling, but I still have plenty of room to slide the 16:9 image up a few inches. I'm not using any keystone or digital correction at all. The zoom makes a difference as I previously mentioned.
As Tom says, have your eye level up around a third of the distance from the bottom of the screen. I prefer to look down than up at my screen, so I could comfortably sit with my eyes half way up the screen. To look up too much can cause neck ache after a while.
HTH
Gary.
My unscientific test for determining if a screen is too low is whether my feet propped up on the ottoman blocks any of the screen. It's kind of close with a HT1000 and a ceiling of a bit less that 8 feet, but I was able to situate the screen to I didn't have to use 3d Reform (I wanted 1:1 pixel mapping from a Bravo D1).
MIKE
MIKE
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Now there's a test I can understand! I measured both my "foot-on-ottoman" level and my eye level, and the tests agree: I don't want to get the bottom of the screen much less than about two feet from the floor. It's close, but this will probably work on the HT1000 without using the keystone correction. I appreciate that people have used that feature without problems, but all other things equal, I'd prefer not to.
| Originally posted by mraub My unscientific test for determining if a screen is too low is whether my feet propped up on the ottoman blocks any of the screen. . . . MIKE |
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