Riflescope with adjustment

The invention relates to a telescopic tube (1) having at least one displacer (4) having a receptacle (9), arranged one in the receptacle (9) the first adjusting mechanism (10) and a in the first adjusting mechanism (10) integrated second adjusting mechanism (11 ) includes. In order to enable easy handling and safe adjustment of the optical elements of the telescopic tube, a locking element on the receptacle (9) for locking the first adjusting mechanism (10) is provided, which for releasable engagement into a corresponding counterpart element (17) (at the first adjusting mechanism 10 is formed).