A system for illuminating a specimen are disclosed herein. In general, the system may include an illumination source configured to generate light with an uneven distribution at a pupil plane and field stop of the system, a lightpipe coupled for redistributing the light across the pupil plane and field...http://www.google.com.au/patents/US7654715?utm_source=gb-gplus-sharePatent US7654715 - System and method for illuminating a specimen with uniform angular and spatial distribution
