So I was doing my homework on eyepieces, and could not identify the type of eyepieces which came with my 1970's Criterion Dynamax 6"
Here's your Big Chance - Any ideas? Thanks!
Yep on both counts. There’s a confusion about Plossls and Symmetrical eyepieces. A true Plossl is not symmetrical.yobbo89 wrote: ↑Fri May 08, 2020 10:07 pm https://www.cloudynights.com/topic/513442-criterion/
Posted from a user at cn :
The AR is achromatic Ramsden= kellner type eyepiece.
The ASP is a plossl. Think the AS stands for Asymmetric
Achromatic Ramsden = Kellner. Period. Kellner invented the achromatic Ramsden.
Carl Kellner is often neglected perhaps because he died rather young.notFritzArgelander wrote: ↑Fri May 08, 2020 10:52 pmAchromatic Ramsden = Kellner. Period. Kellner invented the achromatic Ramsden.
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