A Course in Lens Design by Chris Velzel

Author:Chris Velzel
Language: eng
Format: epub
Publisher: Springer Netherlands, Dordrecht

components of negative power,

use of mirrors.

Glass selection is important with thin systems, where we have no other possibility to correct field curvature. The Petzval sum of a thin doublet achromat is given by

(5.21)

meaning that should be small and large to make P/K small. It is easy to see from the glass chart that this is not well possible for existing glasses. See Fig. 5.15, where we have drawn contours of V/n = 20, 30, 40 in the glass chart. We see that on these contours, within the region of existence, the variation of V is limited.

Fig. 5.15Schematic version of the glass chart. Existing glasses are in the grey area. Contours of V/n = 20, 30, 40 are shown

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