Aperture Priority
Hold aperture; the solver picks the matching shutter.
Where to find it
Viewfinder Priority Mode chip Aperture
Summary
Pick your aperture, let the meter pick the shutter. The classic depth-of-field-first workflow: you choose how much background blur or sharpness you want and the app finds the shutter speed that matches the scene EV.
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How it works
What it does
Switch the priority chip to Aperture. Pick the f-stop you want (e.g., f/2 for a portrait, f/11 for a landscape). The meter holds that aperture and varies the shutter to match the scene's metered EV. Move to a brighter or darker scene and the shutter changes; the aperture stays put.
When to use it
Anytime depth of field is the variable that matters most: portraits where you want a specific bokeh look, landscapes where you want everything from foreground rocks to mountains in focus, macro work where you need a specific working aperture for diffraction balance.
What the solver does
The solver computes the shutter as scene_EV - log2(aperture_squared) + log2(ISO/100) and rounds to the closest standard or custom shutter increment. If the answer falls outside your camera's shutter range, it warns and suggests a different aperture or ISO.
Pairs with stop increment
Recommended shutters land on the stop increment you have selected (FULL/HALF/THIRD). If you click only in halves, the solver returns a half-stop value rather than a third that you cannot actually set.