Fix it
Why Your Mirrorless Camera Won't Focus (2027)
Fix a mirrorless camera that will not focus: AF modes, focus-area settings, firmware, and lens contacts, step by step.
A camera that hunts or refuses to lock focus is usually a settings problem, not a broken camera. Work through these fixes in order; nine out of ten focus failures resolve before step four.
Autofocus hunts back and forth and never locks
Switch from single-point AF to a wide or zone area mode so the camera has more contrast to evaluate, and confirm the AF mode matches the subject: single-servo (AF-S) for still subjects, continuous (AF-C) for moving ones. In very low light, add light with the AF-assist beam or a phone flashlight to give the system contrast to bite on.
Focus locks on the background instead of the subject
Enable subject or eye detection in the AF menu; without it, the camera defaults to the highest-contrast area, which is often the background. If the subject is small in frame, switch to a flexible spot area placed directly on the subject rather than letting the camera choose.
Autofocus worked yesterday but fails today
Check that the lens focus switch is set to AF, not MF; it gets bumped in bags constantly. Then power off, remove and reseat the lens to clean the electronic contacts through friction, and confirm the camera is not in a focus-limit range (many telephotos have limiter switches) set beyond your subject distance.
Third-party lens focuses slowly or inconsistently
Update the lens firmware via the manufacturer's dock or app; Sigma, Tamron, and others regularly release AF performance updates for new camera bodies. If problems persist, the lens may need its focus calibration updated for your specific body, which the dock utilities handle.
Questions, answered
Does manual focus override damage the lens?
No on focus-by-wire mirrorless lenses, which is nearly everything current. Full-time manual override is designed into the system; just make sure the camera is set to allow it in the AF menu.
Why does autofocus fail in low light?
Phase-detection needs contrast and light; below roughly -4 EV even good systems struggle. Open the aperture, raise ISO to give the sensor more signal, or add a video light. This is physics, not a defect.
When should I send the camera for service?
When the failure follows the body across multiple lenses, persists after a factory reset, or involves visible viewfinder/display artifacts. If one lens misbehaves on multiple bodies, the lens is the suspect instead.