The present invention relates to a method of telescoping a main boom consisting of a telescopic boom (5) which is guyed by a spotting boom (10), the raised main boom being braced during the telescoping operation by means of the spatial stay. The invention further relates to a crane with a telescopic main boom (5), a spatial stay (10) and a crane control, the crane control having a means for determining the required guying dimension of the guying. based on the current length of the main boom during the telescoping operation. The present invention is applicable in the field of cranes.
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