Short test scenes—with real actors, locations, lighting—proving style, tone, and technical feasibility of an ambitious project. Essential for pitches and previs.
You shoot three, four minutes of material — real actors, real location, real lighting — to show your producer or investor: This is what it looks like. This is proof-of-concept. Not an animatic, not a storyboard animatic. Real images. Because some projects are so specific, so visually idiosyncratic, or technically experimental that you can't explain them — you have to show them.
The classic situation: You have a script that is visually radical. Period setting with a digital look. Or handheld documentary style on a blockbuster budget. Or a color dramatization that the financing team needs to understand to release the millions. You shoot one or two scenes — not the whole thing, but representative. Your DP is there, you test camera angles, lenses, lighting atmosphere. The editor cuts it together. The director sees: This works visually, exactly as I imagined it. The financier sees: Okay, this isn't a risk, this is a style I understand.
Proof-of-concept films also solve practical problems before principal photography. What does the period look like under LED lighting? Can you still focus with this camera in this location at this aperture? What lens distortion occurs with extreme wide-angle? You won't want to find out in the editing room when you've already had 40 shooting days. Better: You know it beforehand. That's why proof-of-concept films are also a tool for previsualization — not as a cartoon, but as real photographic planning.
The budget for this is small: one to two shooting days, one location, one to two main actors, lighting and camera equipment as planned. No more than 20,000 to 50,000 Euros, depending on how specific the requirements are. Some producers still need to be taught that this is an investment, not a luxury. Because a misguided multi-million dollar project costs exponentially more than the proof-of-concept material beforehand. Some of the best visual films of recent years — whether sci-fi or arthouse — have gone with proof-of-concept material. This doesn't show uncertainty. It shows professionalism. It shows: We know what we're doing.