Projectors > Important parameters > Projection aids >
Each projector has an individual, optical axis that sets how high an image can be projected above the lens axis. A relationship of 19:1 means that the image will be divided up into 20 parts, 19 of which will be projected above and 1 below the lens central axis.
With a relationship of 10:1 we talk about 'Con axis', i.e. the projection's lower edge is at the same height as the lens.
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