Walk the sightline before choosing the size
Begin at the house with the chairs you already own. Carry a drink along the proposed route and notice where you naturally slow down. A screen position is less useful if it forces guests past cables, along a slippery lawn edge or through the projector beam every time they leave their seats. Keep the main circulation route beside the audience where possible.
Place a temporary outline where the image might go, using removable markers on a suitable surface rather than fastening anything to plants. Sit at the nearest, furthest and outermost positions. Check that everybody can see the bottom of the picture without a raised chin. Consider a wheelchair user’s view and leave a companion space with an equally good sightline, not a leftover place behind the group.
Choose the surface for this particular garden
A smooth, pale wall can be the simplest starting point, but texture, colour and surrounding light all affect the picture. Inspect the wall in daylight and test a film scene after dusk. Do not assume that expensive equipment can remove the visual effect of rough render or a strong paint colour. Check ownership and permissions before drilling, painting or adding permanent fixings.
A removable framed screen offers a more predictable surface and lets the garden return to normal afterwards. It also needs assembly space, secure supports and a dry storage location. A hanging fabric screen is lighter to store, but folds and movement can distract during a film. A household sheet is useful for an early experiment; its translucency and wrinkles make it an unreliable benchmark for a finished setup.
Should the screen face the house?
Sometimes, but only if window light, open doors and household movement do not fall across it. Compare both orientations after dark before deciding. Keep the main exit usable in either arrangement.
Let the projector determine the distance
Find the exact model’s throw-ratio range in its manual. Image width multiplied by throw ratio gives an approximate lens-to-screen distance; the manufacturer’s calculator or installation guide should resolve model-specific details. Use image width, not the diagonal measurement advertised on many screens. A very short garden may require a different screen size rather than an improvised projector position.
For example, a throw ratio of 1.5 and an image width of 2 metres imply an approximate 3-metre lens distance. This is a geometry example, not a recommended size for every garden. Allow additional space for the projector body, ventilation and connections. Avoid relying on heavy digital keystone correction to rescue a poor position: start with the lens aligned as the manufacturer intends.
Ambient light matters as much as the headline brightness number. Porch lamps, neighbouring windows and summer twilight can flatten dark scenes. Test at the intended start time using both a bright scene and a quiet, shadowy one. A smaller image may be more satisfying than a larger, washed-out picture. Do not aim light into neighbouring homes or public routes.
Treat wind as a design limit
A screen catches wind even when the evening feels gentle at chair height. Follow the screen manufacturer’s anchoring method and stated operating limits. Never invent a ballast weight or attach a large surface to a fence, tree or pergola without knowing the structure can take the load. Underground services and irrigation must be considered before any ground anchor is installed.
Leave room for mature foliage around the frame and avoid compressing planted soil with repeated foot traffic. Branches should not rub against the screen, cover ventilation openings or require damaging pruning simply to make the equipment fit. If a suitable position cannot be found without stressing a tree or narrowing the path, reduce the setup rather than forcing it into place.
Finish by rehearsing the shutdown. Know who will manage the screen, where its parts will go and when the evening will move indoors. A reliable small arrangement is easier to enjoy than an impressive one that needs constant watching. Once the picture has a sensible home, turn your attention to the seats and the route around them.