Show students how to properly align their microscope for parfocality by teaching them the concepts of depth of field and depth of focus.
Any microscope with adjustable eyepieces and several different magnification (air) objectives will do. For demonstration purposes, a stereoscope/microscope with a continuos magnification changer and adjustable eyepieces is most suitable.
The students stand around the demo-microscope while teacher explains and shows how to set the microscope up for proper parfocality. Then they should repeat on their student microscopes (or in turn on the demo set up).
Peter Evennett, Jan Peychl
Most students have no idea what all those numbers on microscope objectives stand for. The idea is to present them with a range of different objectives and help them understand them.
Peter Evennett, Britta Schroth-Diez, Silke White
Helps students to get a feeling for pixel sizes, resolution and the correct sampling.
for each student:
Dan White, Britta Schroth-Diez, Jan Peychl