Bowen I S, Vaughan A H
Appl Opt. 1973 Jul 1;12(7):1430-4. doi: 10.1364/AO.12.001430.
The optical specifications of two astronomical telescopes designed to permit wide-field photography with critical definition are presented and compared. The 40-in. (1.016-m) and DuPont 100-in. (2.54-m) telescopes use modifications of the Ritchey-Chretién design with Gascoigne correctors. By avoiding the need for field flatteners through choice of mirrors yielding zero Petzval sum (40-in. telescope) or bending of photographic plates to a moderate field curvature (100-in. telescope), it was possible to achieve monochromatic images of ? to (1/4) sec of arc over fields of 3 degrees and 2.1 degrees , respectively.
介绍并比较了两台旨在实现具有高清晰度的宽视场摄影的天文望远镜的光学规格。40英寸（1.016米）和杜邦100英寸（2.54米）望远镜采用了带有加斯科因校正器的里奇-克莱琴设计的改进型。通过选择产生零佩兹伐和的镜面（40英寸望远镜）或使照相底片弯曲以适应适度的场曲（100英寸望远镜），避免了使用场平器的需求，从而分别在3度和2.1度的视场上实现了弧秒至（1/4）弧秒的单色图像。
