I’ll assume that you have the correct position from left to right for your projector–there is only 1 center-line from the screen to mount along, so it’s hard to get that wrong–but the distance from the screen is another story. The focus knob is designed to fix issues in which the projector image is just a few inches out of sync with the distance to the screen, but if the projector is off much more than that on placement, then it’s time to consider moving it. Don’t just use any piece of cloth to clean the lens, you can seriously damage it–follow our step-by-step guide to cleaning a projector lens! Change the Positioning of the Projector Relative to the ScreenĪssuming you’ve already tried to use the built-in focus knob to fix the image, and you’ve checked the projector lens for dust, fingerprints, etc., it’s now time to start considering the projector placement. When in doubt, it’s best to clean the lens off. If that happens, though, you just have to wait for the projector to come back to room temperature naturally. One strange issue you might have if you store your projector in a garage or attic, for instance, is that any big swings in temperature may even cause condensation to form within the lens. If the projector has ever been disassembled, dust could actually be inside the lens causing the problem, but that’s much rarer. However, for a projector that has just been sitting there for a while, dust may have found its way onto the lens over time without the help of fingerprints. The most common being fingerprints, which leads to dust collecting on the lens as mentioned above. Different things can cause this type of issue. That’s where the light comes from, after all, so if there are greasy fingerprints that have collected dust here, that will interfere with the light beam and lead to distortion. If part of the image you’re seeing is in focus and looks correct, but other parts of the image are blurry, or if the entire image is too blurry/fuzzy to even allow you to dial in the focus, then this could be an issue with the lens of the projector itself. Maybe it’s not your entire image that’s blurry or fuzzy, just a small part of it. If you’re still pre-install, we have an article discussing the throw ratio and some calculations you can do to get it right. Remember, that slice always exists, our job with the projector focus knob is to move it so that the slice exists on the screen. When you first turn the projector on is when you use the focus ring to move that slice of the light beam where the image looks good back and forth. You start with where you want the screen, then put the projector far enough back that it will work based on its throw ratio. Instead, we use focus to allow ourselves an easy install. However, we don’t have the luxury of setting up a projector, turning it on, and moving the screen closer and further away to find that slice where the image from the light beam looks good. That slice of the light beam from the projector where the image has been expanded just enough that it looks good always exists. The reason I bring this up is that it helps to understand focus if you realize that if you were to move the screen and “check” whether the image looks good from various distances in front of the projector, you will always find some distance at which the image looks good. So, something really obvious is happening here: the further you get away from the projector, the larger the image is getting. In most instances, people like to project at least a 100-inch diagonal image on a projector screen. If you put your hand directly in front of the projector, it will project a small rectangle not much larger than a postage stamp. And most problems with fuzziness are simply small mismatches between where the image is in focus vs. This shift in distance either narrows or expands the image coming out of the lens. Your projector will have a physical focus adjustment ring around the lens, and twisting this ring adjusts the focus by increasing and decreasing the distances between components in the lens itself. There’s a reason we’re starting with focus: this is the best built-in way to adjust your projector’s image quality, especially if the problem you’re seeing is that the image is blurry or fuzzy.
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