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<blockquote data-quote="Steel_Wind" data-source="post: 2769353" data-attributes="member: 20741"><p>It is a classification of projector. On older units, "short throw lens" were possible add-on attachments - but this harkens back to the days when projectors were pro Audio-Visual equipment and not consumer electronics.</p><p></p><p>Go here to the projector feature search function at Projector Central: <a href="http://www.projectorcentral.com/projectors.cfm?mfg_id=any&res_id=3&ar=0&td=5%27&is=&bll=1000&bul=any&cll=600&cul=any&wll=any&wul=any&prll=any&prul=any&an=0&dvi=-1&trig=1" target="_blank">http://www.projectorcentral.com/projectors.cfm?mfg_id=any&res_id=3&ar=0&td=5'&is=&bll=1000&bul=any&cll=600&cul=any&wll=any&wul=any&prll=any&prul=any&an=0&dvi=-1&trig=1</a></p><p></p><p>There are a few parameters for you to fill in. You want to search the following fields:</p><ul> <li data-xf-list-type="ul"> <strong>Resolution</strong>. Do a few searches - one at SVGA and another at XGA</li> <li data-xf-list-type="ul"> <strong>Image Calc</strong>: Put "5" in there. That means the issue you are concerned about is the size of the image at 5' throw</li> <li data-xf-list-type="ul"> <strong>Image Diagonal</strong>: Put in a number there between 50 and 60. Try your search with different values. This is the size of the projected image in a diagonal measurement when projecting from the distance you specified under "image calc" (in this case - 5 feet)</li> <li data-xf-list-type="ul"> <strong>Brightness</strong>: Lastly, make sure you are looking for units that are at least 1000 ANSI or brighter.<br /> <br /> **Note - I have not included contrast as a search parameter - but this value has a large impact on picture quality as well. Higher the contrast, the better. Modern DLPs are delivering contrast at 2000:1. 500 or lower is going to make you unhappy with picture quality. 300:1 or lower is outside the range of acceptability.<br /> </li> </ul><p></p><p>Run your searches based on these paratmeters and look at the models returned. These would all be "short throw lens" units.</p><p></p><p>By way of example, the search for XGA+5feet+60inch+1000ANSI yields only three units - all of them LCD. You don't get to a 60 inch image from those units at that focal length unless the lens is set to maximum zoom - but it is theoretically possible. Note, however, that at maximum zoom your image is dim and will probably look <em>very</em> "washed out". </p><p></p><p>The same search for a SVGA unit with those specs yields only 2 hits. Ease off on the diagonal range and drop it to 50 - you get more hits. Seeing as you have an extra 6" on the throw distance (you said 5'6") you can make up a bit more size playing with the sliders on the projection calculations to boost your image size.</p><p></p><p>Play with your search parameters on the diagonal size and look at the way the zoom is coming into play to give you your desired projection size. In general, you don't want to push the zoom much past one half its maximum.</p><p></p><p>I really do think that your desired goal of 60" at this throw range needs adjustment. The biggest issue, however, is pixel density. If you increase to XGA resolution over SVGA - you will substantially increase picture quality as the pixel density goes up. As you can see, however, this does come at a higher price.</p></blockquote><p></p>
[QUOTE="Steel_Wind, post: 2769353, member: 20741"] It is a classification of projector. On older units, "short throw lens" were possible add-on attachments - but this harkens back to the days when projectors were pro Audio-Visual equipment and not consumer electronics. Go here to the projector feature search function at Projector Central: [url]http://www.projectorcentral.com/projectors.cfm?mfg_id=any&res_id=3&ar=0&td=5%27&is=&bll=1000&bul=any&cll=600&cul=any&wll=any&wul=any&prll=any&prul=any&an=0&dvi=-1&trig=1[/url] There are a few parameters for you to fill in. You want to search the following fields: [list] [*] [b]Resolution[/b]. Do a few searches - one at SVGA and another at XGA [*] [b]Image Calc[/b]: Put "5" in there. That means the issue you are concerned about is the size of the image at 5' throw [*] [b]Image Diagonal[/b]: Put in a number there between 50 and 60. Try your search with different values. This is the size of the projected image in a diagonal measurement when projecting from the distance you specified under "image calc" (in this case - 5 feet) [*] [b]Brightness[/b]: Lastly, make sure you are looking for units that are at least 1000 ANSI or brighter. **Note - I have not included contrast as a search parameter - but this value has a large impact on picture quality as well. Higher the contrast, the better. Modern DLPs are delivering contrast at 2000:1. 500 or lower is going to make you unhappy with picture quality. 300:1 or lower is outside the range of acceptability. [/list] Run your searches based on these paratmeters and look at the models returned. These would all be "short throw lens" units. By way of example, the search for XGA+5feet+60inch+1000ANSI yields only three units - all of them LCD. You don't get to a 60 inch image from those units at that focal length unless the lens is set to maximum zoom - but it is theoretically possible. Note, however, that at maximum zoom your image is dim and will probably look [i]very[/i] "washed out". The same search for a SVGA unit with those specs yields only 2 hits. Ease off on the diagonal range and drop it to 50 - you get more hits. Seeing as you have an extra 6" on the throw distance (you said 5'6") you can make up a bit more size playing with the sliders on the projection calculations to boost your image size. Play with your search parameters on the diagonal size and look at the way the zoom is coming into play to give you your desired projection size. In general, you don't want to push the zoom much past one half its maximum. I really do think that your desired goal of 60" at this throw range needs adjustment. The biggest issue, however, is pixel density. If you increase to XGA resolution over SVGA - you will substantially increase picture quality as the pixel density goes up. As you can see, however, this does come at a higher price. [/QUOTE]
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