What is an A.R. eyepiece?

Discuss telescope eyepieces.
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DozerBolt
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What is an A.R. eyepiece?

#1

Post by DozerBolt »


Greetings!
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" Cat: the inscription on the eyepiece itself is "A.R. 30mm" but I have no idea what A.R. stands for, and can't find it anywhere online.
Here's your Big Chance - Any ideas? Thanks!
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Re: What is an A.R. eyepiece?

#2

Post by Ozypic »


Anti-reflective. Is what comes up in a quick search..... it sounds good
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Re: What is an A.R. eyepiece?

#3

Post by yobbo89 »


A good question, not my field, I only know of these. H eyepiece is the typical cheap eyepiece you get in low end toy scopes :lol:
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scopes :gso/bintel f4 12"truss tube, bresser messier ar127s /skywatcher 10'' dob,meade 12'' f10 lx200 sct
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Re: What is an A.R. eyepiece?

#4

Post by yobbo89 »


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
scopes :gso/bintel f4 12"truss tube, bresser messier ar127s /skywatcher 10'' dob,meade 12'' f10 lx200 sct
cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7,asi 290 mm
mounts : eq6 pro/eq8/mesu 200 v2
filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, chroma 3nm ha,sii,oiii,nii,rgb,lowglow,uv/ir,Thousand Oaks Solar Filter,1.25'' #47 violet,pro planet 742 ir,pro planet 807 ir,pro planet 642 bp ir.
extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel,tele vue 2x barlow .

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Re: What is an A.R. eyepiece?

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Post by notFritzArgelander »


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
Yep on both counts. There’s a confusion about Plossls and Symmetrical eyepieces. A true Plossl is not symmetrical.
Scopes: Refs: Orion ST80, SV 80EDA f7, TS 102ED f11 Newts: AWB 130mm, f5, Z12 f5; Cats: VMC110L, Intes MK66,VMC200L f9.75 EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binoculars: Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker IV, Vixen Porta II, Celestron CG5
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Re: What is an A.R. eyepiece?

#6

Post by yobbo89 »


So I'm guessing it's an improved version of the Ramsden, that's achromatic but they didn't come up with a name so they called it a.r until kellner came. Around. Probs why it's a bit harder to google search.
scopes :gso/bintel f4 12"truss tube, bresser messier ar127s /skywatcher 10'' dob,meade 12'' f10 lx200 sct
cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7,asi 290 mm
mounts : eq6 pro/eq8/mesu 200 v2
filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, chroma 3nm ha,sii,oiii,nii,rgb,lowglow,uv/ir,Thousand Oaks Solar Filter,1.25'' #47 violet,pro planet 742 ir,pro planet 807 ir,pro planet 642 bp ir.
extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel,tele vue 2x barlow .

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Re: What is an A.R. eyepiece?

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Post by notFritzArgelander »


yobbo89 wrote: Fri May 08, 2020 10:13 pm So I'm guessing it's an improved version of the Ramsden, that's achromatic but they didn't come up with a name so they called it a.r until kellner came. Around. Probs why it's a bit harder to google search.
Achromatic Ramsden = Kellner. Period. ;) Kellner invented the achromatic Ramsden.
Scopes: Refs: Orion ST80, SV 80EDA f7, TS 102ED f11 Newts: AWB 130mm, f5, Z12 f5; Cats: VMC110L, Intes MK66,VMC200L f9.75 EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binoculars: Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker IV, Vixen Porta II, Celestron CG5
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Re: What is an A.R. eyepiece?

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Post by notFritzArgelander »


notFritzArgelander wrote: Fri May 08, 2020 10:52 pm
yobbo89 wrote: Fri May 08, 2020 10:13 pm So I'm guessing it's an improved version of the Ramsden, that's achromatic but they didn't come up with a name so they called it a.r until kellner came. Around. Probs why it's a bit harder to google search.
Achromatic Ramsden = Kellner. Period. ;) Kellner invented the achromatic Ramsden.
Carl Kellner is often neglected perhaps because he died rather young.

https://en.wikipedia.org/wiki/Carl_Kellner_(optician)
Scopes: Refs: Orion ST80, SV 80EDA f7, TS 102ED f11 Newts: AWB 130mm, f5, Z12 f5; Cats: VMC110L, Intes MK66,VMC200L f9.75 EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binoculars: Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker IV, Vixen Porta II, Celestron CG5
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Re: What is an A.R. eyepiece?

#9

Post by DozerBolt »


Thanks guys - excellent insights...

"Achromatic Ramsden" feels close - Wikipedia has a great description of eyepiece types, but that one is not there.
My only feedback is that, I have Kellner, Orthoscopics, and a couple of Plossl's, and this one simply looks a little bit different to me, at least in construction. It also has noticeably shorter eye relief than my other Kellner. Of course, even that varies between brands.

But it does make sense that these would be, Kellners, perhaps before that branding name took hold.

Here's another picture - interestingly, inside the 1.25" tube, it's a 0.965, complete with threads (sneaky devils)
(I wish I had known that before I bought an adapter for my Tasco 9F!)
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AR and Plossl eyepieces.jpg
DozerBolt from Northern California
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Re: What is an A.R. eyepiece?

#10

Post by Lady Fraktor »


Kellner. Three-element Kellner (and its close modifications – Achromatic Ramsden “AR” and Modified Achromatic “MA”) are considered to be the least expensive eyepiece for starting astronomy.
Meade still includes MA eyepieces with their telescopes.

With long focal length telescopes they can be decent eyepieces.
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