Fix It On Set, Not in Post

There's a phrase in VFX circles that gets said with a knowing sigh: "We'll fix it in post." It's a joke, because everyone who's done the work knows that post can't fix what the camera got wrong — it can only paper over it, slowly and expensively. A wobbly handheld shot, a green screen lit unevenly, a reflection you didn't notice, a background you never captured clean — each of those adds hours or days to a shot that could have been minutes, and often the result still looks off. The single most valuable habit you can build as a budget filmmaker is to think, in the moment on set, "what does post need from this shot?" and then spend the extra two minutes to give it. That two minutes is the highest-leverage time in your entire production. So this chapter is deliberately practical: a short, memorable checklist of the handful of things worth grabbing on the day, every time you shoot an effects shot.

The on-set VFX checklist

For any shot that needs an effect, run through these before you move on:

• Shoot a clean plate. After the take, keep the camera exactly where it is, clear the actors and props, and roll ten seconds of the empty scene. This one habit makes removals and comps trivial — it's the most important thing on this list.
• Lock the camera when you can. A tripod or a locked-off shot means your effect element and clean plate line up perfectly. If the shot must move, move it slow and smooth so it can be tracked.
• Add tracking markers. For screen replacements, set extensions, or anything comped onto a moving surface, place small, high-contrast markers (tape crosses, dots) that post can track and then paint out.
• Grab lighting reference. A quick photo of a grey ball and a chrome ball — or even just a phone photo of the set and a note on where the light comes from — lets you match CG or comped elements to the scene's light.
• Measure and photograph. Rough distances, lens, and height, plus reference stills of the location, save you from guessing later. Thirty seconds of notes beats an hour of detective work in post.
• Keep green off your subject. Give actors distance from a green screen and flag spill so you're not fighting green edges on skin and hair for days.

Two minutes now, two days saved later

What ties this whole checklist together is a mindset shift: on set, you are banking assets for post, not just capturing a performance. The clean plate, the markers, the reference — none of it shows up in the final film, and that's exactly why undisciplined crews skip it. But every one of those items is the raw material that makes an effect fast and convincing instead of slow and fake. I've watched a set-extension shot that should have taken half a day balloon into a week because nobody shot a clean plate or noted the lens, and I've watched a genuinely tricky wire-removal get finished before lunch because the operator locked the camera and grabbed ten seconds of empty frame. Same difficulty, wildly different outcomes — decided entirely by two minutes of discipline on the day. Build this checklist into your process so it's automatic: every effects shot ends with "clean plate, markers, reference, notes." It will feel like it's slowing you down on set, and it is, by a couple of minutes. But it's buying back days at the computer and, more importantly, buying a result that actually holds up. With your foundations set — realistic expectations, a solid plan, and disciplined capture — you're finally ready to talk tools. The next chapter walks through the free and cheap software that will do all the heavy lifting, and thanks to the groundwork you've laid, it'll have an easy job.