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BKSTS Illustrated Dictionary of Moving Image Technology, 4th Edition by Martin Uren

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Appendix E Projected image size calculation

image

Figure App.E.1 Projected image size

Normal projection

The width of the projected picture, W = (T × A)/f

Anamorphic projection

The width of the projected picture, W = (T × A × 2)/f

where,

W = projected picture width (m)

T = projection distance (m)

A = projector aperture width (mm). (See Table App.E.1.)

f = focal length of projection lens (mm)

Table App.E.1 Projector aperture widths

Film type Aperture width
Super-8 film 5.4 mm
16 mm film 9.6 mm
35 mm film 21.1 mm
Film strip and half-slide 22.5 mm
Standard 50 mm slide 34.5 mm

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