Re: Roland's October 1981 Sky & Telescope article: "An Apochromatic Triplet Objective"
It’s amazing how useful a Christen triplet from that era remains as compared other contemporary technological innovations such as the rotary dial telephone. Some things really do stand the test of time.
From: <firstname.lastname@example.org> on behalf of "Roland Christen via groups.io" <chris1011@...>
It's from a time when people actually looked thru a scope with things called eyepieces (and had telephones attached to walls, with rotary dials on them).
From: Pete Lardizabal <p14@...>
Sent: Tue, Feb 23, 2021 1:52 pm
Subject: Re: [ap-ug] Roland's October 1981 Sky & Telescope article: "An Apochromatic Triplet Objective"
Many thanks James!
Read this long, long ago in a land far, far away.