Achromatic doublet design and optimization
Basic Concepts One of the most common optical structures is the achromatic doublet. It is used to reduce chromatic aberrations. At its most basic, it is a two lens system configuration where one lens is a concave lens, usually made of a flint glass, and the other is a convex element, usually made with crown […]
An Overview of Wide-Angle Lens Projections
There are two primary methods of image formation in lens design. 1. Perspective projection (F-Tan Theta lenses also called Rectilinear or Orthoscopic). 2. Equidistant projection (F-Theta lenses also called Equiangular) The Perspective projection method is most often used during the design of lenses with field of view in the 40-60 degree range. This formation method […]
Exploring the Scheimpflug Principle: Depth and Clarity in Imaging | OFH
Introduction The Scheimpflug principle is a fundamental concept in optics, particularly in the realm of photography and imaging. Named after its inventor Theodor Scheimpflug, this principle provides a systematic approach to achieving extended depth of field in photographs and precise focus control in optical systems. At its core, the Scheimpflug principle addresses the challenge of […]
5 Applications of Cylindrical Lenses
Introduction When thinking of a ‘lens’, most people have the image of a spherical lens in their mind, but there are different geometries for lenses, and one of the most common is the cylindrical lens. What’s the difference between spherical and geometrical lenses? And what applications require cylindrical lenses? In this article we will discuss […]
Understanding RMS Wavefront Error: An In-Depth Exploration | OFH
Introduction to RMS Wavefront Error As mentioned in several articles in this blog, aberrations are of great relevance when designing an optical system. The objective being to design a system that creates a “good image”. However, there are different metrics to evaluate what is a “good image”. Most of the time, a customer won’t express […]