Can you record with two back cameras at the same time on iPhone?
No, not in DualCam. "Dual camera" gets used for two different things, and it is worth being precise about which one an app actually does before you pick it for a shot. One meaning is what DualCam does: the front camera and one back lens recording at the same time, composited into a single frame — you in one part of the picture, whatever you are pointing the back camera at in the other. The other meaning is two back lenses running together, for example the wide and the ultra wide, or the wide and the telephoto, without the front camera involved at all.
DualCam is built for the first kind. There is no mode where two rear lenses record side by side while the front camera sits idle.
What DualCam actually pairs
Every layout in DualCam — picture-in-picture, split top and bottom, split left and right — is built from exactly two live feeds: the front camera and one back lens. Which back lens is a separate choice (ultra wide, wide or telephoto, depending on what your iPhone has), but only one of them is active in a recording at a time, alongside the front camera. That pairing is the whole premise of the app: your face and whatever the back camera sees, landing in the same file at the same second, which is what makes it useful for reactions, vlogging commentary, and interviews where the audience needs to see both a person and what they are looking at.
Why the back lens is a picker, not a second feed
The lens picker for the back camera lists ultra wide, wide or telephoto and lets you choose one before you record. It is a selector, not a mixer — picking telephoto does not add a second back stream on top of the wide lens, it replaces which physical lens feeds the back half of the frame. Switching between them is treated like changing resolution: something you settle before you start, not mid-take.
That design follows directly from what the app is composing. Two live feeds already make up a session — front camera plus one back lens. Adding a third live feed, a second back lens, would mean composing three images into a frame that only ever has two slots to fill in any of DualCam’s layouts, so it is not a smaller version of an existing feature — it is a different kind of app.
Why front-and-back, and not two back lenses
DualCam pairs front and back because of what people actually shoot with it: opening a package and reacting to it in the same frame, narrating a street while walking through it, showing your hands doing something while your face explains it, two people talking into one phone. Every one of those needs a camera on the subject and a camera on you, at once. A phone pointed only at what is behind it can’t do that — which is exactly the problem a two-rear-lens app is solving instead: comparing what a wide and a telephoto lens see of the same subject, not putting you in the picture at all.
If what you actually want is your two back lenses recording together — say wide and ultra wide, for a close-up next to a wider reference shot of the same subject — that is a genuinely different feature from what DualCam offers, and worth looking for in an app built around that pairing specifically rather than expecting a front-and-back app to also do it.
Common follow-up questions
Does "dual camera" always mean front and back?
No. It is used for both front-plus-back apps like DualCam and for apps that pair two rear lenses. Check which pairing an app actually uses before assuming — the name alone does not tell you.
Can I use the ultra wide and telephoto lens together in DualCam?
No. The back lens picker lets you choose one lens — ultra wide, wide or telephoto — to pair with the front camera. It is a single choice, not a way to run two back lenses at once.
Is switching back lenses the same as recording two lenses at once?
No. Switching the back lens changes which single physical lens feeds the back half of the frame, alongside the front camera. It replaces one feed; it does not add a second one.
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.