Quote Originally Posted by Nodda Duma View Post
By the way, in lens design circles, the Petzval forms the basis for a large and widely used family of small, very fast, narrow field of view objective designs.. in visible and infrared imaging systems. You wouldn't immediately recognize modern Petzvals as related to the original, but the way they work is all derived from the original.
Yes, and the Petzval design is still a popular choice in better-quality refracting telescopes:

https://optcorp.com/collections/petzval-telescopes