How to film a product review video with both iPhone cameras
A product review has the same two halves as an unboxing or a tutorial — the thing itself, turned in your hand so the camera can see it, and your own reaction and opinion narrating it — but it adds one wrinkle the others don’t: the object usually gets held closer to the lens than your face ever is, and it moves more, tilting and rotating so a viewer can see a seam, a button, a texture. Recording the front and back cameras at once still puts the product and your face into one file from the moment you pick it up, so a review does not need a separate demo clip shot after the fact and narrated over from memory.
The general setup for simultaneous recording is covered elsewhere; this page is about what is specific to reviewing a product — framing for something you rotate rather than something that sits still, keeping focus on the object instead of your face, why the light on the product and the light on you are two separate problems, and deciding your lens before you start rather than mid-review.
The product leads, your face reacts — until you talk straight to camera
Most of a review is the object itself — the box opening, the seam catching light, the button under your thumb — and your face is there to react and narrate, not to compete with it for space. Picture-in-picture with the back camera filling the frame is the natural default: the product fills the recording, and your face rides in a small window in whichever corner is not where you plan to hold the item up.
That balance flips for the sentences where you are actually speaking your verdict to the lens — an opening line naming what you are reviewing, a closing recommendation. DualCam lets you swap which camera fills the frame at any point during the recording, so that switch can happen live: face-led for the lines that open and close the review, product-led for the demonstration in between.
A product you rotate rules out one split
If you prefer a split layout to picture-in-picture, the two ways to split are not equal for something you turn in your hand. A top-and-bottom split keeps the full width of both frames, which matters here because a review rarely holds the product dead centre and still — you tilt it to show a side, rotate it to catch a logo, or move it toward the lens for a close detail.
A left-and-right split crops roughly a quarter off each side of both source frames to fit a vertical canvas, and that missing edge is exactly where a rotated product goes first. It is fine for a static unboxing shot where the item stays put in the centre of frame, but for a review where you turn the thing in your hand, top-and-bottom or picture-in-picture keeps more of it on screen.
Keep focus on the product, not on your face
Tap-to-focus carries exposure with it, and each frame in a dual recording is focused and exposed independently of the other. When you tap the back-camera frame on the product, that is where focus and exposure lock — not on your face in the small window, which is exactly the priority order a review needs, since a soft or badly lit face is forgivable but a soft product shot defeats the point of the video.
Pinch-to-zoom works within whichever back lens is active, useful for pushing in on a small detail without moving the product itself. Switching to a different physical lens — ultra wide for a wider unboxing shot, telephoto for a tighter one — is a separate control that is not available mid-recording, so decide which lens shows the product best before you press record rather than planning to switch partway through.
Two exposures that rarely agree
The front and back cameras set exposure independently, each reading only the frame it sees, and a product review makes that mismatch more visible than most subjects because the product is often held closer to a window or a desk lamp than your face is. Neither camera knows what the other is looking at, so the item can read perfectly exposed while your face sits noticeably dark or dull right next to it — or the other way around if you are the one near the light.
Tap whichever frame needs help rather than trying to fix both sides in one move, since there is no shared correction between the two feeds. If colour is the mismatch rather than brightness — a warm desk lamp on the product against cooler daylight on your face, or the reverse — Warm or Cool can nudge one scene toward the other, and Mono removes the disagreement entirely by taking colour out of the frame.
Get close when you read the fine print
Dual camera recording writes one audio track, not one per camera, taken from whatever iOS has selected as the input. Distance to the microphone matters more than any setting, and a review is full of moments — reading a spec off the box, quoting a price, sounding out a model number — where getting the phone a few inches closer to your mouth does more than anything else could.
Do not set the product down on the same surface the phone is resting on. A box or a device set down firmly travels straight through that surface into the microphone at the phone’s bottom edge, and it is an easy habit to fall into mid-review when your hands are full. A stand a little further along the desk, off the surface you are actually using, keeps the one audio track clean.
A full review is longer than one take
A dual-camera recording runs straight through from record to stop with no way to pause it mid-file, and a review already comes with natural break points that make that easy to work with: one take per feature, one take for the unboxing, one take for the verdict. There is no need to hold a single continuous take across a five-minute walkthrough when the file is just as usable cut into a handful of shorter ones.
Breaking a review into shorter takes also helps with heat, which adds up over a long recording — two live camera pipelines and a GPU composite running continuously draw on the same thermal budget the whole time you are rolling. If the phone does get hot enough, DualCam drops a fresh 1080p recording to 720p before it starts, or ends an in-progress one and saves what it has rather than losing the take outright; shorter takes make either outcome far less likely to matter.
Common follow-up questions
Should I use picture-in-picture or split screen for a product review?
Picture-in-picture with the back camera leading is the safer default — it keeps the product as the full frame while your face rides in a corner. If you want a split, use top-and-bottom rather than left-and-right: the left-right split crops about a quarter off each side, which is exactly where a rotated product goes.
Can I switch to a wider or closer lens partway through a review?
No — which back lens is active is not among the controls that change mid-recording. Layout, the picture-in-picture corner, size, shape and filter can all change live, but the lens has to be decided before you press record.
Why does my face look dull next to a product that’s exposed correctly?
The two cameras set exposure independently, so a product near a window or lamp and a face under ordinary room light are two problems that don’t automatically match. Tap the frame that needs help, or use Warm, Cool or Mono if the mismatch is colour rather than brightness.
Want to just do this?
DualCam records the iPhone front and back cameras at the same time and writes one finished MP4 while you shoot. Free, no account, no ads, nothing leaves the phone.