CALCULATIONS

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These simple equations enable image sizes or projection distances to be calculated for any given values.
(All dimensions must be in mm).

Image Size

Projection Distance   (m)	Focal Length  (mm)	Object Size*  (mm)
Image Size (m):

Projection Distance

Image size  (m)	Object Size*  (mm)	Focal Length  (mm)
Projection Distance (m):

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Focal Length

Projection Distance  (m)	Image size  (m)	Object Size* (mm)
Focal Length (mm):

Object size*

Image Size  (m)	Focal Length  (mm)	Projection Distance  (m)
Object Size (mm):

* 40 mm diameter is the OBJECT SIZE of most OPTI standard effects.
Custom images have a maximum OBJECT SIZE of 38mm.

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