Depth Field is a pocket notebook for photographers who want to see how far acceptable sharpness really runs before they raise the camera. You choose a sensor gate, a focal length, an aperture, and a focus mark. The app draws the near and far limits, the hyperfocal distance, the field of view, and the full-frame equivalent, then writes one plain English sentence about what that combination will do on a portrait, a street, a landscape, or a close product. Saved studies stay on the iPhone. There is no account and no cloud.
