Five Focus Mistakes That Ruin Footage, and How to Catch Them

1. Trusting the small camera screen

The rear screen on most cameras is small and bright, and it flatters almost everything. A frame that looks crisp at arm's length can turn out soft once it is viewed on a laptop or a large monitor. Many learners in our test sessions tell us the same story: they checked focus on the camera, saw nothing wrong, and found the problem only during review.

The fix is to judge focus on a larger monitor whenever the setup allows it, and to use magnification on the camera itself when it does not. Zoom in on the eyes, hold for a second, and look for fine detail in the lashes rather than general sharpness. Make this a fixed step before every take, not something you do when a shot feels doubtful.

• Check on a larger monitor when possible
• Magnify to the eyes before each new setup
• Judge fine detail, not overall impression

2. Treating peaking as proof of focus

Focus peaking paints coloured edges on whatever the camera considers sharp, and it is a useful guide. The mistake is to read it as a guarantee. Peaking responds to contrast, so a busy background, a textured sweater or a bright edge can light up while the face behind it sits slightly off.

Treat peaking as a way to find your focus plane quickly, then confirm with magnification. Lower the peaking sensitivity if the screen looks crowded, and pick a colour that stands apart from your subject's clothing and set. Peaking tells you where to look; your own eyes, with the image enlarged, tell you whether the focus is actually right.

3. Focusing once and never again

A subject who leans forward, shifts weight or walks a few steps changes the distance to the lens, and the focus you set at the start no longer applies. At event shoots this happens constantly, especially during speeches and group portraits where people drift without noticing.

Build rechecks into the rhythm of the day. Confirm focus after any change in position, after a lens or aperture change, and after every long pause. With a wide aperture the margin is only a few inches, so what looked safe at the start of a session can be soft twenty minutes later. A quick magnified glance costs seconds and saves whole clips.

• Recheck after every position change
• Recheck after changing lens or aperture
• Recheck after long breaks between takes

4. Skipping a test target

Eyes and faces are poor references for diagnosing a lens, because they move and vary in contrast. A simple printed focus target, placed at the subject's position, shows immediately whether a lens focuses accurately at that distance. Some lenses consistently land slightly in front of or behind the point you chose, and only a flat target reveals the pattern.

Run this check once for each lens and camera body before the shoot, at the aperture you plan to use, and write down what you find. If one lens back-focuses, you can correct for it or choose a different lens that day. Knowing this in advance is calmer than discovering it while a client waits.

5. Forgetting what changes between cameras

On multi-camera jobs, each body and lens behaves a little differently. One camera may offer strong magnification tools while another has coarse peaking, and operators end up trusting the weaker display without realising it. The result is footage where one angle is reliably sharp and another is just short of it.

Agree on a shared checking routine before recording starts, and have each operator run it on their own camera. Note any quirks, such as a lens that drifts when the camera is tilted, in the handover notes so the next person is not caught out. A routine that every operator can repeat is what keeps the cameras consistent with each other.

• Use the same checking routine on every camera
• Record camera and lens quirks in handover notes

Making the checks a habit

None of these mistakes comes from carelessness. They come from time pressure and from tools that look more reassuring than they are. The remedy is a short, fixed sequence you can run without thinking: locate the focus plane, magnify, confirm on a larger display, and recheck whenever something moves.

During early autumn, when many studios start the busy portrait and event season, it is a good moment to rehearse that sequence on a quiet day. Practise it with your own cameras and write down what you learn, so the routine is ready when the schedule fills up.