Optscopes Phase Contrast Microscopes are those in which a Phase Contrast Condenser is fitted to provide light to a transparent or colourless object to intensify their contrast for medical research.

Zernike succeeded in devising a method--now known as Phase Contrast microscopy--for making unstained, phase objects yield contrast images as if they were amplitude objects. Amplitude objects show excellent contrast when the diffracted and direct light are out of step (display a phase difference) by 1/2 of a wavelength. Zernike's method was to speed up the direct light by 1/4 wavelength so that the difference in wavelength between the direct and deviated light for a phase specimen would now be 1/2 wavelength.

Optscopes manufactures Phase Contrast Microscopes strictly according to the Zernike Method, giving the best observations available.