Fast IR Fisheye Lens with Hyper-Hemispherical Field of View

J. Brian Caldwell

This month's patent design is a fisheye lens for long wavelength IR (8-12 μm wavelength range) that covers a full field of 270° at an astonishingly large aperture of f/0.7. This combination of field coverage and aperture is unprecedented, but in spite of the extreme specifications, the design is quite simple, consisting of only four germanium elements. The design would provide an interesting challenge to a manufacturer because the concave surface of the negative meniscus front element is hyper-hemispherical

Log in or become a member to view the full text of this article.

This article may be available for purchase via the search at Optica Publishing Group.
Optica Members get the full text of Optics & Photonics News, plus a variety of other member benefits.

Add a Comment