Soft focus is a photographic and cinematographic technique in which the image is rendered with slightly reduced sharpness across some or all of the frame, creating a diffused, dreamlike quality distinct from both sharp focus and the clearly blurred bokeh of a shallow depth of field. Unlike unintentional out-of-focus shooting, soft focus is a deliberate aesthetic choice achieved through specific optical techniques, and the result retains the overall shape and detail of the image while wrapping it in a gentle haze or glow.

Soft focus can be achieved through several optical methods: dedicated soft-focus lenses that introduce spherical aberration while maintaining the image's core structure, diffusion filters placed in front of or behind the lens, fine mesh or silk stretched over the lens, petroleum jelly applied to a clear filter, or in post-production through layering a slightly blurred version of the image over the sharp original with blend modes. Each method produces a subtly different quality of softness. The technique has historically been associated with glamour and beauty photography, golden-era Hollywood portraiture, and romantic or fantastical filmmaking contexts where a heightened, non-realistic visual quality serves the material. In contemporary use, soft focus carries connotations of nostalgia, memory, dream sequences, and idealized beauty, and its deliberate application is understood as a signal of those emotional registers. Used sparingly and purposefully, soft focus adds a layer of visual poetry that sharp, clean imaging cannot replicate.

When prompting AI image and video generation, "soft focus," "diffused dreamlike quality," "gentle haze," or "romantic soft light with slight diffusion" guides the model toward outputs with the characteristic warmth and softness of intentional focus diffusion rather than technical blur or sharp clarity.