Question 1

How to calculate the projected image size?

Accepted Answer

The projected image size is calculated from the projection distance and the lens throw ratio. Formula: Image width = Projection distance / Throw ratio. For example, with a 10m distance and a throw ratio of 1.5, you get a 6.67m wide image. The calculator automatically performs this calculation in both directions.

Question 2

What is the throw ratio of a lens?

Accepted Answer

The throw ratio is the ratio between the projection distance and the image width. For example, a throw ratio of 1.5 means that at 15m distance, you project a 10m wide image. A low throw ratio (0.8-1.2) corresponds to a wide-angle lens, a high throw ratio (2.0+) corresponds to a telephoto lens.

Question 3

How to calculate the lux needed for my projection?

Accepted Answer

Lux depends on the projector power (ANSI lumens) and the projected surface area. Formula: Lux = ANSI lumens / Surface (m²). For quality outdoor projection, aim for 300-500 lux minimum. For indoor, 150-300 lux may suffice. The calculator helps you find the required power based on your target lux.

Question 4

What is pixel size and why is it important?

Accepted Answer

Pixel size is the physical size of a projected pixel on the surface (in mm). It is calculated by dividing the image size by the projector resolution. A pixel size of 2-5mm is generally optimal for architectural mapping viewed from medium distance. The closer the audience, the smaller the pixel size must be to avoid pixelation.

Video Projection Calculator

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