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The design problems of high aperture triplet objectives


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Edara, Krishna M 1969 , 'The design problems of high aperture triplet objectives', Unspecified thesis, University of Tasmania.

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An investigation has been made of the roots of a certain cubic equation
f(Yob) = 0, which arises in the theory of the type-111 triplet photographic
objective. It has been shown that with the residuals and the parameter
values such as might be used in the type 111 triplet, this equation gives
three positive roots of which only one leads to a practical solution.
It was shown that if certain parameters which enter into the coefficients
of Yob in this cubic equation are given values much greater than is usual
in a type 111 objective, a second root of the equation leads to a practical
solution. In this way, a new region of triplet solution has been opened - up
characterised by low powers for the components in the initial thin lens
arrangement. It was expected that this region would provide a basis for the
development of high aperture objectives.
The general physical principles underlying the achievement of these high
values of initial parameters has involved a careful study of the properties
of thick meniscus shaped cemented triplet components of negative power.
A procedure for the design of a type 131 objective, which is the simplest
form of objective incorporating these principles, has been developed and is
described with numerical examples. A study of more complex objectives is
needed to exploit the principles which have been opened up in this work. The
time available for the investigation has not permitted the study of type 133
and other objectives from this point of view.

Item Type: Thesis - Unspecified
Authors/Creators:Edara, Krishna M
Keywords: Photographic lenses
Copyright Holders: The Author
Copyright Information:

Copyright 1969 the Author - The University is continuing to endeavour to trace the copyright owner(s) and in the meantime this item has been reproduced here in good faith. We would be pleased to hear from the copyright owner(s).

Additional Information:

Thesis (M.Sc.) - University of Tasmania, 1969. Bibliography: p. 41-42

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