Back button focus tracking does not lock focus when recomposing; focus drifts or reacquires after releasing the button.

Sony camera firmware does not allow locking focus with back button in AF-C tracking mode; focus continues to track or resets when button is released, preventing reliable focus-and-recompose.

Severity

3Medium

Willingness to Pay

implied

Added

May 27, 2026

Implied Software Gaps

Camera firmware that provides a true focus lock mode for back button focusing

App Concept

FocusLock Pro

A firmware enhancement or accessory app that adds a true focus lock mode for back button focusing. It decouples tracking from the AF-ON button so that a single press sets and locks focus, ignoring any further movement until deliberately reactivated.

Key Features

Single-press focus lock with back button
Toggle between tracking mode and lock mode
Visual indicator (e.g., green box lock symbol) when focus is locked
Compatible with Sony E-mount cameras (a6xxx, a7, a9 series)

Target Users: Sony mirrorless camera users, especially sports, wildlife, and event photographers who rely on back button focus and recompose technique.

Revenue Model: $9.99 one-time in-app purchase for firmware upgrade or $2.99 per month subscription for continuous updates and support

Existing Solutions Mentioned

Sony a6400Sony 4.5-6.3/60-350 G OSS lensBack button focusAF-C modeTracking center / tracking small spot

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