A new optical-fluorescence microscopy technique, called HR-OPFOS, is discussed and situated among similar OPFOS-implementations. OPFOS stands for orthogonal-plane fluorescence optical sectioning and thus is categorized as a laser light sheet based fluorescence microscopy method. HR-OPFOS is used to make tomographic recordings of macroscopic biomedical specimens in high resolution. It delivers cross sections through the object under study with semi-histological detail, which can be used to create three-dimensional computer models for finite-element modeling or anatomical studies. The general innovation of this class of microscopy setup consists of the separation of the illumination and observation axes, but now in our setup combined with focal line scanning to improve sectioning resolution. HR-OPFOS is demonstrated on gerbil hearing organs and on mouse and bird brains. The necessary specimen preparation is discussed.