Microscope system for use in high magnetic fields

We describe a microscope system, with video output, that operates within the confines and the high magnetic field of the 195 mm wide bore, 20 T resistive magnet at the National High Magnetic Field Laboratory. The accessibility of this system allows the user to vary the field of view and focus in situ and to produce images with up to 10 micron resolution. It allows for temperature regulation of samples to within 1 degrees C and in situ sample manipulation. Images of a biological specimen, Xenopus laevis embryos, in high magnetic field are presented. (C) 2000 American Institute of Physics. [S0034-6748(00)02608-3].