How to film a rock climbing or bouldering video with both iPhone cameras
Most dual-camera shots let you adjust the framing as you go — you can see the preview, nudge the phone, try again. A climb does not give you that. Once you leave the ground your hands belong to the wall, not the phone, so whatever the back camera is pointed at when you press record is what it is pointed at for the whole attempt. That is a harder framing problem than it sounds, because a route is taller than it looks from the base, and a fall can happen anywhere along it — the frame has to hold the whole thing, not just the part that looked interesting when you set the phone down.
The other thing that makes climbing different from most activities filmed this way: the person whose reaction is worth catching is often not the climber. A climber mid-route is looking at the next hold, not at a phone propped up somewhere below. The reaction that actually reads on camera — the flinch at a fall, the shout at a send — usually belongs to whoever is standing at the base watching, spotting, or holding the rope.
Decide the frame before you leave the ground
Set the phone up, then actually climb the first few moves, or watch someone else do it, before you press record — not to check what the shot looks like standing still, but to see how far up and how far sideways the route actually goes once a body is moving on it. A boulder problem that looks compact from the ground often drifts several feet to one side at the crux, and a taller route can put the top-out well above where a phone braced at chest height would naturally frame it. Back up further than feels necessary, and use the ultra wide lens on the back camera if your iPhone has one — that lens choice locks the moment recording starts, so it has to be right before you press the button, not adjusted partway up.
The canvas DualCam writes to is exactly what the viewfinder shows when you start — there is no re-cropping afterward. A send that tops out half out of frame, or a fall that lands on the crash pad just outside the edge of the shot, stays that way permanently. If the route is tall enough that the whole thing will not fit without losing detail, it is usually better to frame for the crux and the landing zone together and accept that the very top of an easy finish is out of shot, rather than framing for the top and cropping the part where most falls actually happen.
Picture-in-picture, with the belayer or spotter in the small window
A route needs its full width to read, the same reason a wide shot beats a tight one for anything where the whole line of motion matters. Split screen crops roughly a quarter off each side to fit two 16:9 sources into a vertical canvas, which is the wrong trade for a shot that already wants more width, not less. Picture-in-picture keeps the route at full size and gives the second camera a corner instead.
What goes in that corner is worth thinking about deliberately, because on a climb it is rarely the climber's own face. Point the front camera at whoever is at the base — the belayer paying out rope, the spotter tracking a bouldering fall, the friend waiting their turn — and their reaction becomes the second half of the shot. Put the small window in whichever corner sits furthest from where the crux and the landing actually are, so a clean send is not also the one take where the inset happened to cover the exact hold or the exact spot on the pad that mattered.
A bouldering session is mostly attempts, and that changes how you record
A single problem can take a dozen tries and twenty minutes before anyone sticks it, with only the last few seconds worth keeping. Stopping the recording after each attempt and starting fresh for the next one, rather than pausing and resuming a single long file, keeps a clean send as its own short clip in DualCam's library instead of buried somewhere inside a long recording full of chalking up and shaking out between tries. Every attempt sits there with its own thumbnail afterward, so finding the one that landed is a scroll through the library, not a scrub through one long timeline hunting for the right few seconds.
That same repetition is also why falls end up in the footage as often as sends, and that is worth treating as part of the clip rather than something to edit around later — DualCam writes one finished file per take, so whatever happens during a recording is what is in it. If a fall is going to be part of what gets kept, framing wide enough to include the landing in the first section above is what makes that footage usable instead of just showing someone drop out of frame.
The session tests the phone as much as the climb tests you
Bouldering and cragging sessions run long, often outdoors in direct sun, with the phone sitting still and exposed the entire time rather than being carried and shaded the way it would in a pocket. Two live camera feeds plus a real-time composite is real, sustained work for the hardware, and heat is one of the things that can end a dual-camera recording partway through — which is the worst possible moment for it to happen, since a stopped recording mid-attempt cannot be resumed into the same file. Between problems, actually look at the phone rather than assuming it is fine because the last recording finished cleanly: a phone that has been sitting in the sun for an hour behaves differently than one that just started.
A phone left propped against a rock or a pack at the base is also easy to knock over between attempts, which loses the shot in a much simpler way than heat does. A short tripod or a dedicated mount that will not shift when someone brushes past it while retying knots is worth carrying for this specifically — the same phone position has to hold for every attempt on a problem, so losing that position between tries means reframing from scratch rather than just pressing record again.
Common follow-up questions
Should a climbing clip use picture-in-picture or split screen?
Picture-in-picture. The route needs its full width to read — split screen crops roughly a quarter off each side to fit two sources into a vertical canvas, which works against a shot that already needs more width, not less.
Who should be in the small picture-in-picture window — the climber or someone else?
Usually whoever is at the base: the belayer, a spotter, or the next person waiting to climb. A climber mid-route is looking at the wall, not the camera, so their face rarely produces a reaction worth keeping. The person watching from the ground usually does.
Can I switch to a wider back lens mid-climb if the route needs more room than expected?
Not mid-recording — the back lens is one of the settings a dual-camera recording locks the moment it starts. Stop the current attempt, switch lenses, and start the next one as a new file; that is free to do between tries, just not inside one continuous recording.
What happens to the footage if the recording stops on its own partway up a route?
Whatever was recorded up to that point is saved as a complete, playable file — a dual-camera recording that stops early because of heat, storage or an interruption closes out properly rather than leaving a corrupted clip. What it cannot do is resume into the same file, so if that happens mid-attempt, the send itself will need a fresh recording.
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