How to film a car review video with both iPhone cameras

A back lens that actually fits the car in frame

The obvious problem with a car is that it is long, and a parking spot rarely gives you enough room to back away and fit the whole thing into a normal wide shot. DualCam’s back lens picker offers ultra wide, wide or telephoto depending on what your iPhone has, and for an exterior walkaround, ultra wide is usually the one that actually solves the distance problem — it lets a car fill the frame from three or four feet away instead of needing the width of two parking spots to step back into.

The trade-off is the one ultra wide always carries: straight lines near the edge of the frame bow outward, and a car’s own long, straight lines — the roofline, the door seams, the beltline — are exactly what shows that distortion most clearly. It reads as a minor, forgivable thing in a fast-moving walkaround shot; it reads as a flaw the moment you hold still on a single panel to point something out. Wide, or a pinch-zoomed wide, is the better choice for those held shots — a dashboard detail, a badge, a stitching pattern — where a straight line matters and you actually have room to stand back a step.

Which lens is active locks in for the whole take the same way resolution does, so this is a decision for before you start walking around the car, not something to fix once you notice a curved fender in the footage. If a review genuinely needs both a wide establishing shot and a closer detail shot, that is two takes with two different lens choices, not one continuous recording.

Picture-in-picture and top-and-bottom hold a car together better than a crop

The back camera filling the frame with the car, your face and voice riding in a picture-in-picture window, is the natural default for the same reason it works for a product review — the car is the thing being demonstrated, and it should have the space. DualCam lets you drag that window to any of the four corners and pick from three sizes, so it can sit wherever it does not cover the part of the car you are pointing at.

If you would rather split the screen, top-and-bottom keeps the full width of both frames, which matters more here than in most reviews: you are walking the length of a car, not turning an object in your hand, so anything that crops the sides works against you constantly rather than occasionally. A left-and-right split crops roughly a quarter off each side of a vertical canvas to fit it, and on a car that missing quarter is routinely a headlight, a mirror or half a door — the part of the vehicle you just walked into frame to show.

Paint and glass fight the exposure before the two cameras even disagree

Reflective surfaces are a general photography problem before they are a dual-camera one: a clear-coated body panel and a windshield both act like imperfect mirrors, throwing back whatever bright sky or sun is behind you, and a camera metering that reflection rather than the paint underneath will expose for the glare and let the actual color and detail sink into shadow. Angling the car — or yourself — so the panel you are describing is not aimed straight at the sun fixes most of this before you press record, the same fix a single-camera photo of any car needs.

On top of that, the front and back cameras in a dual recording still meter independently, each reading only its own frame. A body panel that is catching a clean reflection can read correctly exposed on the back camera while your face, standing in whatever light happens to be behind you in a parking lot, reads dark or washed out on the front camera right next to it — two separate exposure decisions that were never going to average themselves out. Tap whichever frame needs the help; if the color temperature is the real mismatch — daylight on the car against shade on your face, say — Warm, Cool or Mono can close that gap the way they do for any other outdoor mismatch.

One microphone hears the engine as clearly as it hears you

A dual recording writes a single mono audio track from whatever iOS treats as the default input, not one channel per camera and nothing that isolates your voice from what else is happening around it. An idling engine, another car passing through the lot, a gust across the pavement — all of it lands in the same track as your narration, at whatever level the world outside actually produces. Turning the engine off while you record the walkaround, and starting it back up only for the parts where it is actually the subject, keeps that one track from fighting itself.

Reading a spec off a window sticker or a door-jamb label is the same trick that helps in any review: get the phone closer to your mouth than feels necessary, because distance affects a single built-in microphone far more than anything you can fix afterwards. Outdoors, a gust of wind across that same microphone shows up as a dull roar with no clean edit around it — see the guide on reducing wind noise for what actually helps, since none of it is a setting inside the app.

Exterior and interior are two takes, not one

A dual-camera recording runs straight through from record to stop with no way to pause it, and a full review rarely wants to be one take anyway — the exterior walkaround, sitting in the driver’s seat for the interior, and a closing verdict to camera are three different setups with three different lighting problems. Stopping and starting a fresh recording for each one costs nothing; a normal video editor joins them afterwards the same way it joins any other clips.

Splitting it up also buys real thermal headroom. Direct sun adds genuine heat to the phone itself, on top of what two live camera pipelines and a GPU composite already generate, and that combination is what actually ends a long exterior take — not storage, which a ten-minute walkaround barely touches. Shoot the exterior first while the phone is cool, sit in the shade of the car’s own doorway for the interior segment, and give the phone a minute out of direct sun between takes rather than holding one long recording from the driveway to the back seat.