coma at the foci of oblique pencils or must fulfil the sine See also:
MICROSCOPE) having foci with ratio of 3 to I, gives a fairly large flat field of view approximately free from distortion of tangential lines and from coma, while the Mittenzwey variety of it (fig.
time to obtain a large flat field of563 view with oblique achromatism and freedom from coma and distortion, there is no better construction than the modified Kellner eye-piece (fig.
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