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Contrast enhancement by changing the objective lens focal length
Author(s) -
Misell D. L.
Publication year - 1976
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1111/j.1365-2818.1976.tb01074.x
Subject(s) - focal length , contrast (vision) , optics , lens (geology) , image contrast , resolution (logic) , physics , materials science , computer science , artificial intelligence
SUMMARY Recent experimental results on the variation of resolution and contrast of electron microscope images with objective lens focal length are compared with theory. Whereas there is agreement between theory and experiment for the normal range of focal lengths (2–6 mm), the experimental results indicate a far higher image contrast and inferior image resolution than predicted by theory for a very long focal length objective (12–14 mm).