Proper alignment of the microscope.
Keller
H Ernst
HE
Carl Zeiss Microimaging, Inc., Thornwood, New York 10594, USA.
D002138:Calibration; D007909:Lenses / Q000592:standards*; D008027:Light; D008029:Lighting / Q000295:instrumentation / Q000379:methods; D008853:Microscopy / Q000295:instrumentation* / Q000379:methods*; D055095:Optics and Photonics / Q000295:instrumentation*