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Quarterly Journal of Microscopical Science, Vol s3-91, 109-110, Copyright © 1950 by Company of Biologists
1 Bureau of Animal Population, University of Oxford
With those low-power objectives in which a phase-plate can be placed near the back focal plane, phase-contrast microscopy can be obtained without the use of any condenser. The illuminating annulus is placed in the conjugate focus of the phaseplate.