Microscope system for use in high magnetic fields

We describe a microscope system, with video output, that operates within th e confines and the high magnetic field of the 195 mm wide bore, 20 T resist ive magnet at the National High Magnetic Field Laboratory. The accessibilit y of this system allows the user to vary the field of view and focus in sit u and to produce images with up to 10 micron resolution. It allows for temp erature regulation of samples to within 1 degrees C and in situ sample mani pulation. Images of a biological specimen, Xenopus laevis embryos, in high magnetic field are presented. (C) 2000 American Institute of Physics. [S003 4-6748(00)02608-3].