Use this cinematography or projection calculation to plan image geometry, exposure, timing, storage, film footage, or presentation from explicitly stated camera and display parameters.

Actual Focal Millimeters (mm)

Required number input.

Sensor Diagonal Millimeters (mm)

Required number input.

35 mm full-frame-equivalent focal length using the 36×24 mm diagonal divided by the camera sensor diagonal. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Equivalent Focal Millimeters (mm)

The resulting equivalent focal millimeters returned as a number.

• Angle-of-view and equivalent-focal-length calculations use nominal sensor or film dimensions and an ideal rectilinear lens. Focus breathing, distortion, image-circle cropping, stabilization, anamorphic optics, and manufacturer crop conventions can change the captured field.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Confirm critical values with the actual camera, lens, codec, projector, and delivery specification, then run a camera or projection test under representative conditions.

• Angle Of View Diagonal

  Diagonal angle of view for a rectilinear lens from sensor diagonal and focal length.

• Aperture From F Stop

  Entrance-pupil diameter from focal length divided by f-number; not the physical diaphragm diameter.

• Circle Of Confusion

  Conventional permissible circle-of-confusion diameter from sensor diagonal divided by a user-selected viewing divisor; not an optical constant.