Editing Microscopy (section)

==== Dark field ====
{{Main|Dark field microscopy}}
Dark field microscopy is a technique for improving the contrast of unstained, transparent specimens.<ref>{{cite web | vauthors = Abramowitz M, Davidson MW | title = Darkfield Illumination | date = 2003-08-01 | url = http://micro.magnet.fsu.edu/primer/techniques/darkfield.html | access-date = 2008-10-21 | archive-date = 2015-11-23 | archive-url = https://web.archive.org/web/20151123031042/http://micro.magnet.fsu.edu/primer/techniques/darkfield.html | url-status = live }}</ref> Dark field illumination uses a carefully aligned light source to minimize the quantity of directly transmitted (unscattered) light entering the image plane, collecting only the light scattered by the sample. Dark field can dramatically improve image contrast – especially of transparent objects – while requiring little equipment setup or sample preparation. However, the technique suffers from low light intensity in the final image of many biological samples and continues to be affected by low apparent resolution.

[[File:Rheinberg 6.jpg|thumb|250px|A [[diatom]] under Rheinberg illumination]]
''Rheinberg illumination'' is a variant of dark field illumination in which transparent, colored filters are inserted just before the [[Condenser (microscope)|condenser]] so that light rays at high aperture are differently colored than those at low aperture (i.e., the background to the specimen may be blue while the object appears self-luminous red). Other color combinations are possible, but their effectiveness is quite variable.<ref>{{cite web | vauthors = Abramowitz M, Davidson MW | title = Rheinberg Illumination | date = 2003-08-01 | url = http://micro.magnet.fsu.edu/primer/techniques/rheinberg.html | access-date = 2008-10-21 | archive-date = 2008-09-29 | archive-url = https://web.archive.org/web/20080929144548/http://micro.magnet.fsu.edu/primer/techniques/rheinberg.html | url-status = live }}</ref>