The print viewing distance for correct perspective varies in proportion to the camera's focal length. The hyperfocal distance can be corrected for this by another simple calculation. Basic math that we may have rarely used since elementary school lets make these approximations in the field without charts or calculators.
The photo's subject can be an important factor in DOF, but is often neglected. A Weston seashell or nude is more about light and form than about texture, while a bare tree silhouetted against the sky demands sharp detail. Individuals' perceptions of sharpness vary widely. Charts and calculations are handy tools, but a thorough understanding of DOF lets the serious photographer develop a more effective personal approach.