Glossary
Aperture
Also called: f-stop, f-number
The opening inside the lens that controls how much light passes through.
Aperture is described by an f-number such as f/2.8 or f/11. A smaller number means a wider opening and more light; a larger number means a narrower opening and less light. Aperture also controls depth of field: wider apertures give shallower focus, narrower apertures give more in focus. Each whole f-stop change either doubles or halves the light, the same as one stop of shutter or ISO.
Where this shows up in the app
Aperture f/0.95 to f/64 with half/third stops
Pick aperture in full, half, or third stops across the entire practical range.
Viewfinder > Aperture chip, or Equipment tab > Lenses
Custom f-stop entry
Type any f-number for unusual or vintage lenses.
Equipment tab > Lenses > Add Custom Lens, or Viewfinder > Aperture chip > Custom
Aperture Priority
Hold aperture; the solver picks the matching shutter.
Viewfinder > Priority Mode chip > Aperture