in the first embodiment , the inventive protective case is formed by a multiplicity of air chambers ( 1 ) made of airtight flexible - material such as rubber or plastic . the individual chambers ( 1 ) are lined up close together on the inner surface of a sheathing ( 2 ) and separated by partitions . the chambers ( 1 ) extend annularly around the total circumference of the protective case . the sheathing ( 2 ) can be of smooth design . the protective case is open on the side opposite the objective portion ( 4 ) of the observation telescope and protrudes beyond the objective portion ( 4 ) at a distance ( a ). the objective ( 4 ) is closed by a suitable protective cap ( 5 ). on the part of the protective case covering the underside of the observation binoculars in the area of the objective portion ( 4 ) a valve ( 6 ) is mounted . said valve ( 6 ) permits the air chambers to be filled and emptied . a gap ( 7 ) is likewise provided on the underside of the protective case through which the tripod leg ( 8 ) of the observation telescope protrudes outwardly . the diameter of the protective case becomes smaller from the open end on the objective portion ( 4 ) to the eyepiece portion ( 9 ) of the telescope in accordance with the diameter of the observation telescope . in the area of the eyepiece portion ( 9 ) the protective case follows the bend of the eyepiece portion ( 9 ) relative to the objective portion ( 4 ) and operating part ( 16 ) in accordance with the angle between eyepiece axis ( 10 ) and optical principal axis ( 11 ) of the telescope . in the area of the protective case surrounding the eyepiece ( 12 ) and the eyepiece portion ( 9 ) its diameter also becomes smaller in accordance with the form of the observation telescope . the end of the protective case ( 13 ) adjacent the eyepiece ( 12 ) is likewise encompassed by the sheathing ( 2 ) of the protective case . on the sheathing of the part of the protective case adjacent the eyepiece there is a loop , cord ( 15 ) or the like ( fig2 ) in order to hold the case ( 1 ) with the telescope disposed therein . the sheathing ( 2 ) of the protective case is provided with seams ( 17 ) as depicted in fig2 which follow the form of the observation telescope located in the case . the protective case can also be made of partially or completely transparent material . this permits the device located in the case to be recognized partially or completely from outside . the second embodiment of the inventive protective case is constructed analogously to the above - described first embodiment , the difference being that a longitudinal slit ( 18 ) extends over the total length of the underside of the case . the air chambers ( 1 ) are accordingly no longer constructed to be continuously annular in the cross section of the case ( 1 ), but sickle - shaped . for holding the protective case together along the longitudinal slit one can provide for example hook and loop pile ( velcro ) closures at right angles to the longitudinal slit ( 18 ) which close the slit . this embodiment allows the inventive protective case to be put on and taken off especially fast since the longitudinal slit ( 18 ) provides a large opening for inserting and removing the telescope into and out of the case ( 1 ).
a protective case for an observation telescope is of inflatable design and fits closely against the outside wall of the observation telescope in the inflated state .