Apple’s Camera app always uses the Multi-Lens Fusion camera system. It automatically switches between the available lenses when needed and, in certain situations, combines image data from multiple lenses to produce the final photo. This behavior is fully automatic and cannot be disabled.
However, there are situations where using only a single physical lens is preferable—for example, when attaching external lenses or working with manual camera settings. One of ProCamera’s key advantages is that it lets you choose between Multi-Lens Fusion and Single Lens operation:
- Single Lens mode is active in semi-automatic SI, manual M, and exposure bracketing EB modes. This means you use each lens (Ultra Wide, Wide, Tele) exclusively.
- Multi Lens mode is active in automatic A mode. It uses all lenses at once and comes with Multi-Lens Fusion.
The design of the Lens Selector indicates which mode is active:
- Multi Lens: In automatic A mode, neither the Lens Selector nor the individual lens buttons have an outline, indicating that Multi-Lens Fusion is active. In this mode, similar to Apple’s Camera app, ProCamera can automatically switch between and combine captures from all available lenses to achieve the best possible result.
- Single Lens: In semi-automatic SI, manual M, and exposure bracketing EB modes, a blue outline around the highlighted single lens button indicates the currently active lens.
When you want to use an external add-on lens make sure to have Single Lens mode active and select the iPhone camera lens to which the external lens is mounted.
Whether multi lens or single lens mode is active also makes a difference for macro photography.
In Multi Lens mode, the ability to quickly switch lenses is an advantage. Also, combining multiple captures from different lenses into the final photo can result in a more detailed image.
Note that manual camera controls like custom exposure times, manual focus, or a custom white balance are available only in Single Lens mode.
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