Abstract
'SOLID' reflecting objectives can be made flat-fielded without introduction of chromatic focal errors. The two long working-distance types resulting, (a) dry and (b) immersion respectively, compare not unfavourably with the type developed by Dr. C. R. Burch1, which itself can have a flat field if used with a normal-incidence oil component of suitable small radius. Examples having approximately the same overall size, obstruction ratio (1 : 7), and astigmatism equal to and two-thirds respectively of the latter type are given below. They have the advantage of retaining constant alignment of the two surfaces, of which only one is non-spherical.
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References
Burch, Proc. Phys. Soc., 59, 1, 47 (1947).
Burch, Proc. Phys. Soc., 57, 567 (1945).
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DREW, R. Flat-Fielded Reflecting Micro-Objectives. Nature 164, 360 (1949). https://doi.org/10.1038/164360a0
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DOI: https://doi.org/10.1038/164360a0
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