The various microscope lenses from Thermosensorik are optimised with regard to aperture, so that very fast lenses are available for all magnification scales: for a reproduction scale of 1:1 with an aperture of f/1.5 and 40 mm operating distance, furthermore the 2.5:1 lens with f/2 and 21 mm operating distance and the 5:1 lens with f/4 and 14 mm operating distance.
The new star amongst the infrared microscope lenses offers tenfold magnification with an aperture of f/8 and alternatively 2.5 mm or 14 mm operating distance. If you need a greater or a variable operating distance, macro lenses form an alternative. Another advantage of macro lenses is their higher depth of focus in comparison to that of microscope lenses.