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512
Chapter Fourteen
Figure 14.10
Alow-index, broadband Cooke triplet which uses calcium fluoride and fused
silica to allow coverage of a spectral band extending from the ultraviolet (UV) to the near
infrared (IR). Note the large spherochromatism and reversed secondary spectrum.
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Some Forty-Four Lens Designs
513
Figure 14.11
Arelatively simple reversed telephoto, or retrofocus, which covers a wide
(±37°) field at f/2.8 and has a back focus over 30 percent longer than its focal length.
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Figure 14.12
A“fish-eye” lens covers a 180° or larger field of view by taking advan-
tage  of  the  heavy  overcorrected  spherical  aberration  of  the  powerful  negative
meniscus front elements, which strongly deviate the principal ray. This spherical
aberration of the pupil causes the entrance pupil to move forward and off the axis
and to tilt at wide angles of view.
514
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Some Forty-Four Lens Designs
515
Figure 14.13
Atypical telephoto lens with an 80 percent telephoto ratio; this config-
uration would make an excellent 35-mm camera lens at a 200-mm focal length.
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Figure 14.14
The classic Dagor combines the front and rear doublets of the Protar
into a triplet. Note the progression of refractive index and the powers of the cement-
ed surfaces. Later versions (see Fig. 13.13) split off the inner crowns, allowing the
use of a higher-index glass for these elements. Note that the latter form has eight
reflecting air glass surfaces vs. four for the Dagor, an important consideration in the
days before low-reflection coatings.
516
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Figure 14.15
The Dogmar is related to the Dagor and Protar in that it can be considered to
consist of two symmetrical meniscus triplet components, each with a central air lens. As
shown here, the Dogmar makes an excellent enlarger lens, being relatively insensitive to
conjugate change.
517
518
Chapter Fourteen
Figure 14.16
ATessar with a reversed rear doublet. This orientation is said to be better
when a high-index rare earth crown is used in the doublet.
Some Forty-Four Lens Designs
519
Figure 14.17
An example of a reversed Tessar with the doublet in front.
520
Chapter Fourteen
Figure 14.18
The Heliar form has doublets front and rear, gaining the advantage of a
roughly symmetrical construction. Just as the Tessar is better than the Cooke triplet,
the Heliar is better than the Tessar.
Some Forty-Four Lens Designs
521
Figure 14.19
An unclassified, good, but rarely encountered form, with a central negative
doublet replacing the flint of the Tessar. Note that the cemented surface of the inner
doublet is a “Merté” surface, as also shown in Fig. 13.19.
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