You set up the projector, the middle of the picture looks great, and the corners are soft. Or the image is wider at the top than the bottom, like a trapezoid. Before you assume something is wrong with the projector, work through a few checks. In many setups the cause is placement, focus or the surface, and each of those is something you can adjust at home.
Why corners go soft
A projector lens throws light at your wall in a cone. A projector aimed squarely at a flat surface can make focusing easier. Placement, tilt and the surface can contribute to blur, but other causes are possible. When the projector is tilted, off to one side, or aimed at a wall that isn't flat, the corners end up a different distance from the lens than the centre. The centre can be in focus while the edges aren't.
Digital keystone correction can square the shape back up, but it reshapes the image in software, so heavy correction can soften detail at the edges. That's why the best fix usually starts with where the projector sits.
Step 1: Square the projector to the wall
- Centre it. Put the projector as close to the middle of the wall as your room allows, so it isn't firing at an angle from the side.
- Level it. Use a flat, stable surface. A small book or a stand can raise it to roughly the height of the picture's middle, which reduces how much it needs to tilt.
- Face it straight on. Turn the projector until the lens points squarely at the wall, not slightly left or right.
If you're still choosing where it goes, our room-fit and throw-distance guide shows how distance and picture size relate.
Step 2: Use keystone correction, lightly
Keystone correction fixes the trapezoid shape you get when the projector is tilted up or down (or sideways, on models that support it). Many projectors offer manual keystone in the settings, and some, like our Mark I, list auto keystone, which adjusts the shape for you.
A good habit: fix as much as you can with placement first, then let keystone handle what's left. The less correction the image needs, the more detail it keeps at the edges.
Step 3: Focus on the right spot
- Use a still image with text, such as a settings menu or a paused title screen. Text shows sharpness more clearly than moving video.
- Try different focus settings and compare the centre with the corners; follow your model's manual.
- Use the focus control your model has. Some projectors use a manual focus ring, others an electric or auto focus you adjust from the remote or menu. The Mark I lists electric focus. Check your manual for your model.
Give the projector a few minutes after switching on before you fine-tune, then check the focus again.
Step 4: Check the surface
A wall that looks flat can still have a slight bow, texture or a seam that shows up at the edges of a big picture. Try shifting the image to a different section of the wall. If the corners sharpen up, the surface was the issue.
A screen gives you a flat, even surface every time. Our screen vs wall guide explains when a screen is worth it and when a plain wall is fine.
Step 5: Check the distance and picture size
Check the distance and image-size range in your manual. If you are within it, try moving the projector slightly closer without going outside the manufacturer's limits, then check the image.
Step 6: Rule out the source
Placement, focus or the wall may be contributing, but the source can soften the picture too.
- Low-resolution video looks soft on a big picture. Try a different, higher-quality video to compare.
- Zoom or scaling settings on your phone, laptop or streaming device can crop or stretch the picture. Set the source to its standard display mode.
- Wireless mirroring can lower quality on a busy Wi-Fi network. If your device and projector support a cable connection, try HDMI to compare. Our guide to connecting a phone to a projector covers both routes.
Step 7: Clean the lens
Dust or a fingerprint on the lens can soften the whole picture. Switch the projector off, let it cool, and follow your manual's lens-cleaning instructions. For many models that means wiping the lens gently with a soft, dry microfibre cloth; avoid household cleaners unless your manual says they're safe.
Quick checklist
- Projector centred, level and facing the wall straight on.
- Keystone used lightly, after placement.
- Focus set on text, comparing the centre with the corners.
- Flat section of wall, or a screen.
- Distance and picture size within the manual's range.
- Good-quality source at standard display settings.
- Clean lens.
Still not sharp?
If you've worked through the checklist and one area of the picture stays blurry no matter what, it's worth getting in touch. Bigly Brothers is a proudly Canadian company, and if you bought your projector from us, our team can help you troubleshoot. Contact us here with a photo of the picture and a quick note on your setup.
Looking for a compact projector with auto keystone and electric focus built in? Have a look at the Mark I or browse all of our projectors.
