A swing prism endoscope with adjustable viewing direction includes a shaft with a proximal end and a distal end and a window of a transparent material that seals an opening on the distal end of the shaft so that it is fluid-tight. In addition the swing prism endoscope includes a pivotable prism on the distal end of the shaft for adjustable diversion of light that falls through the window into the shaft of the swing prism endoscope onto an object lens, where the pivotable prism is made of diamond.
