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

Image Millimeters (mm)

Required number input.

Object Millimeters (mm)

Required number input.

Linear image magnification from image size divided by object size in matching length units. 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]

Magnification

The resulting magnification 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.

• Projector Throw Ratio

  Projector throw ratio as lens-to-screen distance divided by projected image width in matching units.

• Aspect Ratio Calculation

  Unreduced width-to-height aspect ratio for an image or screen measured in matching units.

• Reproduction Ratio

  Macro reproduction ratio as image size on sensor divided by actual subject size; 1 means life size (1:1).