To determine the minimum and maximum diagonal size of an image when you know the projection distance:

Inches:

Maximum diagonal size = (0.6038 ⋅ projection distance) + 1.8898

Minimum diagonal size = (0.4631 ⋅ projection distance) + 1.4000

Centimeters:

Maximum diagonal size = (0.6038 ⋅ projection distance) + 4.8001

Minimum diagonal size = (0.4631 ⋅ projection distance) + 3.5560

To determine the projection distance when you know the diagonal size of the screen image:

Inches:

Maximum projection distance = (2.1593 ⋅ diagonal size) - 3.0229

Minimum projection distance = (1.6562 ⋅ diagonal size) - 3.1291

Centimeters:

Maximum projection distance = (2.1593 ⋅ diagonal size) - 7.6782

Minimum projection distance = (1.6562 ⋅ diagonal size) - 4.2068

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2 • Using the Projector