Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

The Effect of High Index Glasses on the Field Characteristics of Photographic Objectives

Not Accessible

Your library or personal account may give you access

Abstract

Improving field characteristics of photographic objectives has always been the concern of the lens designer. Progress has followed the introduction of glasses with high index and low dispersion. These new glasses have been used in the collective lenses in such a manner as to increase the index difference between collective and dispersive elements. This has the effect of basically moving both tangential and sagittal focal points closer to the focal plane throughout the zonal portions of the field, improving Petzval sum, and increasing covering power. Variations of zonal corrections and covering power with these basically improved characteristics are discussed.

The high index glasses disclosed in U. S. Reissue 21,175 (Morey) and in the more recent patents by DePaolis and Eberlin have been used in a number of lens systems. Comparative examples are shown to illustrate the extent to which Petzval sum is improved and/or covering power is increased with the use of these glasses.

© 1948 Optical Society of America

Full Article  |  PDF Article
More Like This
The Design of Triplet Anastigmat Lenses of the Taylor Type

Robert E. Stephens
J. Opt. Soc. Am. 38(12) 1032-1039 (1948)

Aerial Photographic Equipment and Applications to Reconnaissance*

Amrom H. Katz
J. Opt. Soc. Am. 38(7) 604-610 (1948)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (10)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved