Viewframer

IDEAL RECTILINEAR CAMERA GEOMETRY

Put the field
in frame.

Enter the active sensor size and focal length. See the full field angles, then add an axial distance to estimate the rectangle on a perpendicular plane.

No camera database, inferred crop, photo upload or real-lens calibration. Your entered dimensions define the model.

Define the ideal camera

Plain positive decimals, up to 12 decimal places.

Enter active physical dimensions, not pixels. Software range: 0.000001–1,000,000 mm per required field.

Use the entered nominal focal length as an ideal projection scale. No finite-focus or real-lens correction is applied.

From the ideal projection centre to a perpendicular plane. Blank leaves frame dimensions unavailable; a supplied value must be positive. Software range: 0.000001–1,000,000,000 m.

Z does not automatically mean distance from a lens front or the camera’s sensor mark. The model does not predict macro framing, focus breathing, distortion or stabilization crop.

Read the geometric frame

Rounded display; exact entered fractions in exports.

A field of view starts with assumptions.

Active area matters

A video mode or crop can use less than the full sensor. Enter that mode’s recorded physical rectangle; this tool does not infer it from a camera name.

Angles and dimensions differ

Focal length and sensor size set the ideal angles. Z scales the projected width and height. Leave Z blank if its reference is unknown.

For a 36 × 24 mm rectangle, 50 mm nominal focal length and Z = 3 m, the ideal horizontal angle is about 39.597753° and the projected rectangle is 2.16 × 1.44 m.

See the equations, worked examples and limits ↗