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Which mounting are you guys using, floor or ceiling. If floor mounted what is your distance from the projector to the screen. I have an optima EH 200st short throw projector. The calculator for distance on the optoma website didn't give me accurate distance numbers and I ended up needing to position my projector approximately 10 ft from the screen. The calculator states that it should be 6.5 ft.
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How big is your screen and which aspect ratio do you want to run? See if this calculator gives you any different results.
https://www.projectorcentral.com/Opt...ulator-pro.htm -
Thanks my screen is 9'8"x7'3". It's 4:3 ratio. That calculator gave me the same throw distance of 6.5 feet.
I must be doing something wrong because it doesn't come close to filling my screen at that distance.Comment
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According to the calculator, you'll need to have it mounted 14 inches below the bottom of your image for a floor mount (or 14 inches above for a ceiling mount.) Since your image stretches all the way to the bottom of the screen in 4:3, you would need to have the lens positioned more than a foot below the screen itself. Were you able to do that?
It's not uncommon for the calculator to be a little bit off. But 3.5 feet off seems odd. Have you measured the dimensions of the image that it's projecting from 6.5 feet?Comment
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Thanks for your response. I was not aware that you would need to mount the projector 14 inches below the bottom of the screener a floor mount. Ive seen pictures of many setups where it doesn't appear that they are doing that. I certainly don't have a way to mount it below the screen for a floor mount.
I've measured and remeasured the image and the screen. Part of the problem is that my projector doesn't have a focus ring although I can zoom it in or out a little with the remote control.Comment
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Each projector requires a different space between the lens and the edge of the image (called vertical offset) and that space changes as you move the projector closer or further away. Some projectors only require a couple of inches. I don't know for sure that that's what's causing your issue, but I imagine it probably has something to do with it.
You say that you measured the image (with the 6.5-foot mount). What was that measurement? And you had it set to 4:3 when you took this measurement?Last edited by 3on3putt; 05-18-2020, 07:27 PM.Comment
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So if projector central says 13", my projector can be 13" above the screen? Do they all have to be parallel to the ground? Or can they be angled down at the screen?Comment
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Not only can it be 13 inches above, but it should be 13 inches above. The reason is to eliminate the need for keystone correction. You can place a projector above or below the recommended vertical offset, but then you will be left with a trapezoid shaped image and will have to use keystone correction to "square up" the image, which affects the brightness and overall picture quality as pixels have to get re-mapped. It may not always be possible to get the projector hung at the exact height, but try to get close to the vertical offset given on projector central in order to limit your need for keystone correction as much as possible. In other words, your image will look better if your projector is hung at 13 inches above the screen than it will if it is hung at a different height and tilted.Originally posted by brettmacy18 View PostLast edited by 3on3putt; 05-19-2020, 04:12 PM.Comment
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Thank you 3putt. I will re-check my screen size and room height and plug those numbers into the calculator and give it a go.Comment
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