A beam adaptation device for continuously variable adaptation of electromagnetic radiation propagating along a beam axis of the beam adaptation device with respect to beam parameters such as lateral extent and divergence, in particular for influencing astigmatism and non-rotationally symmetrical beam cross-sections, comprising: an optical input element with a first astigmatism lens unit for receiving the electromagnetic radiation, which provides at least one first lens, which is tiltable with respect to the beam axis for adjustment of astigmatism, wherein the first lens can be oriented by tiling in any direction by an adjustable angle, and a divergence matching lens unit positioned along the beam axis downstream of the first astigmatism lens unit having a second lens for adjusting the divergence local symmetrically, wherein the second lens is positioned symmetrically to the beam axis and the distance between the second lens and the first lens of the first astigmatism lens unit being adjustable along the beam axis; and an optical output element with a second astigmatism lens unit positioned along the beam axis downstream of the divergence matching lens unit and having at least one third lens, which is tiltable relative to the beam axis for adjustment of astigmatism, wherein the third lens can be oriented by tilting in any direction by an adjustable angle and the distance between the second lens of the divergence matching lens unit and the third lens is adjustable along the beam axis. an optical input element with a first astigmatism lens unit for receiving the electromagnetic radiation, which provides at least one first lens, which is tiltable with respect to the beam axis for adjustment of astigmatism, wherein the first lens can be oriented by tiling in any direction by an adjustable angle, and a divergence matching lens unit positioned along the beam axis downstream of the first astigmatism lens unit having a second lens for adjusting the divergence local symmetrically, wherein the second lens is positioned symmetrically to the beam axis and the distance between the second lens and the first lens of the first astigmatism lens unit being adjustable along the beam axis; and a first astigmatism lens unit for receiving the electromagnetic radiation, which provides at least one first lens, which is tiltable with respect to the beam axis for adjustment of astigmatism, wherein the first lens can be oriented by tiling in any direction by an adjustable angle, and a divergence matching lens unit positioned along the beam axis downstream of the first astigmatism lens unit having a second lens for adjusting the divergence local symmetrically, wherein the second lens is positioned symmetrically to the beam axis and the distance between the second lens and the first lens of the first astigmatism lens unit being adjustable along the beam axis; and an optical output element with a second astigmatism lens unit positioned along the beam axis downstream of the divergence matching lens unit and having at least one third lens, which is tiltable relative to the beam axis for adjustment of astigmatism, wherein the third lens can be oriented by tilting in any direction by an adjustable angle and the distance between the second lens of the divergence matching lens unit and the third lens is adjustable along the beam axis.