Derksen bil, Справочное руководство

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Distance between BIL and the projection surface
As a general rule, an increase in the distance between the projector and the projection surface
increases the size of the projection, whereas both contrast and lightness will decrease. Under normal
room-light conditions, BIL is suitable for projections at a close-up range, i.e. 0.5 to 3.5 mtrs.
In darkness, greater distances are possible. The size of the projection can be influenced by the
distance to the projection surface. Therefore we recommend you to test the projection size prior to
mounting the projection lamp. The built-in standard lens with its 40 mm focal distance can be
exchanged by a telephoto lens with a 85 mm focal distance, in order to customise projection sizes
and distance. The 85 mm telephoto lens is available as an optional accessory. For further information
on this, please contact our customer support service.
Fig. 3: Range and size of the projection depending on the distance between projector and
projection surface
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