Long-focus color-corrected petzval-type optical objective

Details Long-focus color-corrected petzval-type optical objective Long-focus color-corrected petzval-type optical objective

1985-12-20

1990-05-29

Dziehzynski, Paul M.

350412, G02B 900

Patent

active

049290711

ABSTRACT:
A modified Petzval-type optical objective is provided, whose design form has a long focal length (i.e., 1000 mm) at a large relative aperture (i.e., f/2) over a field of view of 4.2.degree. without vignetting, which is well-corrected for both monochromatic and chromatic aberrations, and which is color-corrected at four wavelengths over a spectral band extending from the visible to the near-infrared regions of the electromagnetic spectrum. The optical objective is made from only two different optical glasses. The design form can be scaled up or down from the 1000 mm focal length by using an appropriate scaling factor.

REFERENCES:
patent: 4178075 (1979-12-01), Rodgers
Mercado et al., Superachromatic Petzval Objectives, 10-19-1982, JOSA., vol. 72, p. 1725.

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