High-frequency filter of a coaxial construction, comprising one or more resonators (2a, 2b, 2c), at least one of the resonators (2a, 2b, 2c) having the following features: - an external conductor housing comprising two opposing end walls (21, 22), namely having a first end wall and a second end wall at a distance therefrom, between which a housing wall is provided peripherally, - comprising an internal conductor which is configured as an internal conductor tube, - the internal conductor is galvanically connected to the first end wall and extends transversely and preferably perpendicularly from the first end wall towards the second end wall, - the internal conductor ends at a distance from the second end wall and/or is galvanically isolated therefrom, - comprising a pin-shaped or pin-like first tuning element, which protrudes towards the first end wall and which is electrically/galvanically connected to the second end wall, - the first tuning element dips into a longitudinal recess formed in the internal conductor tube, characterised by the following further features: - the first tuning element is mechanically anchored in the second end wall so as to be invariable in the axial length thereof and fixed in rotation, - a second positionally variable tuning element is provided in the longitudinal recess of the internal conductor, the second tuning element consisting of or comprising dielectric material at least in the region facing the second outer wall, - the second tuning element is variable in the axial position thereof in the space between the inner face of the internal conductor and the first tuning element, - the second tuning element is accessible and/or can be actuated from the outside of the first end wall so as to bring about a change in axial position. - an external conductor housing comprising two opposing end walls (21, 22), namely having a first end wall and a second end wall at a distance therefrom, between which a housing wall is provided peripherally, - comprising an internal conductor which is configured as an internal conductor tube, - the internal conductor is galvanically connected to the first end wall and extends transversely and preferably perpendicularly from the first end wall towards the second end wall, - the internal conductor ends at a distance from the second end wall and/or is galvanically isolated therefrom, - comprising a pin-shaped or pin-like first tuning element, which protrudes towards the first end wall and which is electrically/galvanically connected to the second end wall, - the first tuning element dips into a longitudinal recess formed in the internal conductor tube, characterised by the following further features: - the first tuning element is mechanically anchored in the second end wall so as to be invariable in the axial length thereof and fixed in rotation, - a second positionally variable tuning element is provided in the longitudinal recess of the internal conductor, the second tuning element consisting of or comprising dielectric material at least in the region facing the second outer wall, - the second tuning element is variable in the axial position thereof in the space between the inner face of the internal conductor and the first tuning element, - the second tuning element is accessible and/or can be actuated from the outside of the first end wall so as to bring about a change in axial position.