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Antares 0.965" Plossls -- A Classicist's Dream?

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#76 Bomber Bob

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Posted 21 November 2015 - 06:14 AM

I'd love to have a complete set of 1980s Vixen .965" eyepieces.  The two Kellners I picked up see a lot of use.


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#77 kansas skies

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Posted 21 November 2015 - 08:58 AM

The only .965 eyepieces I have at the moment are the Celestron 18mm and 30mm Kellners that came with my OT C90 and the set of four Unitrons with my 114. They are all very nice eyepieces that have been seeing quite a bit of use lately. The only criticism that I might have with any of them is that the Unitrons tend to exhibit noticeable ghosting on brighter objects. It's not enough to spoil my fun, however, and it certainly wouldn't prevent me from picking up another set and putting it to good use if the opportunity was to present itself.

 

Bill



#78 Terra Nova

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Posted 21 November 2015 - 09:49 AM

Hmmm, I've not noticed ghosting to be a general problem. Yes, it occurs on some bright objects under certain conditions with the Kellners, but no more than with any Kellner I've seen. What vintage/series and what eyepieces?

#79 Terra Nova

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Posted 21 November 2015 - 10:17 AM

Celestron/Vixen 0.965" eyepieces:
back row- 25mm K, 18mm K;
front row- 12.5mm K, 7mm O, 6mm O

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Edited by terraclarke, 21 November 2015 - 10:19 AM.

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#80 Terra Nova

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Posted 21 November 2015 - 10:21 AM

Unitron 0.965" old/brass series:
Back row- 5mm O, 4mm O
Middle row- 25mm H, 18mm K, 12.5mm K, 9mm S, 7mm S
Front row- 40mm M (~1.25")

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Edited by terraclarke, 21 November 2015 - 10:28 AM.

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#81 Terra Nova

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Posted 21 November 2015 - 10:30 AM

Unitron 0.965" new/italic series eyepieces:

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#82 Terra Nova

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Posted 21 November 2015 - 10:32 AM

Unitron 9.965" diagonals:
solar diagonal (top)
U slot series and old T slot series prism star diagonals below.

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Edited by terraclarke, 21 November 2015 - 10:34 AM.

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#83 Terra Nova

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Posted 21 November 2015 - 10:34 AM

0.965" Takahashi twist-lock prism star diagonal:

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#84 Terra Nova

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Posted 21 November 2015 - 10:37 AM

Sears color-coded 0.965" eyepieces:

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#85 mattyfatz

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Posted 21 November 2015 - 10:42 AM

:shocked: Unitron Mono!! I'll bet that's a nice view.


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#86 roscoe

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Posted 21 November 2015 - 10:43 AM

I'm sorry, Terra, but you have too many .965's......it is very important that you put 2/3 of them up for sale today!


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#87 Terra Nova

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Posted 21 November 2015 - 10:44 AM

The Monos are nice, my old 32mm Brandon is better.

#88 Terra Nova

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Posted 21 November 2015 - 10:45 AM

Sorry Russ, and I haven't even displayed the RAO, APL, or Goto sets. :(

#89 kansas skies

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Posted 21 November 2015 - 11:20 AM

Hmmm, I've not noticed ghosting to be a general problem. Yes, it occurs on some bright objects under certain conditions with the Kellners, but no more than with any Kellner I've seen. What vintage/series and what eyepieces?

All of my Unitron eyepieces came packaged with my 114. which I assume to be from the late sixties to early seventies. I don't have them close-by at the moment, but I believe they are the 25, 18, 12.5 and 7mm eyepieces that come standard with the Unitron. I know that some do exhibit more ghosting than I've seen in other eyepieces, but it is possible that it might be normal for the various types of eyepieces and I'm not used to it. I will concede that you appear to be in a much better position than I am to make that observation. Still, from my experience so far, they appear to be very nice eyepieces that are very capable of producing razor sharp images. The only other Unitron eyepiece that I have is an 1.25" 25mm Ortho. It's also a very nice eyepiece that I tend to leave in place on my Celestron 60mm when it's not being used as a guidescope.

 

Bill


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#90 Terra Nova

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Posted 21 November 2015 - 11:40 AM

Ghosting is a common problem with Kellners, also all of these old eyepieces, if they were coated at all, only had MgF2 coatings and not on internal surfaces. We have grown accustomed to modern fully multi-coated eyepieces with the latest in anti-reflection coatings, but even so, I have seen a number of very modern 1.25" and 2" FMC eyepieces that exhibit ghosting and flaring with off-axis bright objects.
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#91 Bomber Bob

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Posted 21 November 2015 - 02:57 PM

Maybe the Japanese built .965" eyepieces with native small AFOVs (then added field stops) to prevent ghosting -- not give any room for it...

 

I've seen it just a very few times, and usually with the old Erfles / Kellners when looking at the Moon.  It can be kinda fun -- a tiny mirror image hovering near the original.



#92 Astrojensen

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Posted 21 November 2015 - 04:19 PM

 

Maybe the Japanese built .965" eyepieces with native small AFOVs (then added field stops) to prevent ghosting -- not give any room for it...

That's not how it works. Narrow field eyepieces can have terrible ghosting. It depends on the design. A big source of ghosting (but not the only one) is actually light from the object coming through the eyepiece, gets reflected by your eye back towards the eyepiece and back from the rear lens in the eyepiece and into the eye again! If the curve of the rear lens is such, that the reflection is in focus, when the reflected light hits the retina, then the reflection is small and annoyingly bright. Instead, if the curve of the rear lens is such, that the reflection is spread out and the image is broad and thus imperceptibly faint, you will never see it and the eyepiece will be free of ghosting. Coatings help tremendously, of course, as they will make the ghosting much fainter and this gives the optical designer freedom to choose curves that were previously impossible, if you wanted to avoid ghosting. 

 

 

Clear skies!
Thomas, Denmark


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#93 Bomber Bob

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Posted 21 November 2015 - 05:21 PM

Thomas, I was trying to be funny - 8 hours at work makes me punch drunk!

 

But if I understand you correctly, the tiny Moon ghost that I see is reflected back into the eyepiece FOV by my own eyeball?  Would it move around as I change the position of my head?  That would be a neat experiment to test with my old eyepieces.

 

Has anyone tried one of these:  Astro Optics 1.25" to .965" Eyepiece Adapter --> http://www.ebay.com/...o4AAMXQY8JRgS44

 

It looks like it wouldn't add much back focus.



#94 DreamWeaver

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Posted 21 November 2015 - 11:15 PM

If you would like Terra, I can house sit for you next time you go on vacation.  Your eyepieces would be safe.   :whistle: 


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#95 Peter2000

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Posted 20 February 2017 - 11:20 PM

Hi Doug

 

I am new to the astronomy hobby and this website. Just got one of the old department store refractors made by some company called Eschenbach and want to upgrade the original H 0.965 eyepieces .

 

How is the quality and longevity on the Antares eyepieces ?

I am considering buying couple of those form Hands on Optics.

 

 

Peter



#96 Chuck Hards

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Posted 21 February 2017 - 09:17 AM

I've got five of them, they are terrific eyepieces for the price.  Same optics as in their 1.25" barrels but fitted with .965" barrels.  I believe some or all are now out of production so would advise you grab them while you can.

 

They may not reach focus on every single telescope.



#97 deSitter

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Posted 21 February 2017 - 09:37 AM

I've got five of them, they are terrific eyepieces for the price.  Same optics as in their 1.25" barrels but fitted with .965" barrels.  I believe some or all are now out of production so would advise you grab them while you can.

 

They may not reach focus on every single telescope.

So if one has a nice set of 1.25" Plossls and a .965" adapter or hybrid diagonal, there is no particular advantage in these..

 

-drl



#98 ftwskies

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Posted 21 February 2017 - 10:34 AM

I've had my eye on these for a while.  I want to put together some sort of complete / matched set of .965 to kit with Molly one I get her fixed up.  I can't afford Zeiss or Pentax, so these are at the top of my list for now; plan B is to piece-meal together a complete set of Japanese Celestron orthos and Kellners.  With my other .965 scope -- the C90 -- I have no problem adapting to 1.25, but I want Molly to provide a more vintage experience, including the use of .965's.



#99 Chuck Hards

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Posted 21 February 2017 - 10:45 AM

 

I've got five of them, they are terrific eyepieces for the price.  Same optics as in their 1.25" barrels but fitted with .965" barrels.  I believe some or all are now out of production so would advise you grab them while you can.

 

They may not reach focus on every single telescope.

So if one has a nice set of 1.25" Plossls and a .965" adapter or hybrid diagonal, there is no particular advantage in these..

 

-drl

 

In a .965" barrel, the only advantage is that they would take up less focuser travel.  A 1.25" in a hybrid diagonal or adapter might not reach focus with some scopes.  Probabaly a minority.

 

But you are essentially correct.


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#100 Tenacious

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Posted 21 February 2017 - 11:21 AM

As said be before, the Tasco 11TE-5 (114mm x 900mm reflector) can require a lot of steps to convert to the 1.25" EP format (adapters don't cut it).  To optimize the conversion, a larger secondary is required and the primary should be moved closer to the focuser.  If someone is serious about upgrading the image, these Antares EPs are a substantial improvement (over the stock EPs) without modifying the optical path or the original character of the scope.

 

Welcome to Cloudy Nights!


Edited by Tenacious, 21 February 2017 - 11:26 AM.

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