Cooke triplet design: what's the best crown glass, and is it worth it?

Warren J. Smith

doi:10.1117/12.284055

25 September 1997 Cooke triplet design: what's the best crown glass, and is it worth it?

Warren J. Smith

Proceedings Volume 3130, Lens Design, Illumination, and Optomechanical Modeling; (1997) https://doi.org/10.1117/12.284055
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

The best glasses for use in the positive elements of an anastigmat lens are commonly understood to lie along the upper-left boundary of the glass map. That is, the best glasses have a high refractive index and/or a high v-value (low dispersion). These characteristics reduce the aberration contributions of the positive elements, and make possible lens designs which have smaller residual aberrations than designs which use glasses below the upper-left boundary. However this diagonal boundary line represents a trade-off between high index at one end and high v-value at the other. Thus the question becomes: "Which end of the boundary is best? Should one choose a glass with a high index at the expense of a low v-value, or vice-versa?" We discuss a controlled study of five triplet anastigmat configurations (of f-number and field angle), each using five glasses from along the boundary. The merit function (rms spot size), the MTF, and glass cost are presented as a function of the glass position along the boundary line.

Citation Download Citation

Warren J. Smith "Cooke triplet design: what's the best crown glass, and is it worth it?", Proc. SPIE 3130, Lens Design, Illumination, and Optomechanical Modeling, (25 September 1997); https://doi.org/10.1117/12.284055

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available