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Which are the rarest refractors?

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#101 Marcus Roman

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Posted 07 October 2019 - 09:00 AM

I have not run across many of these either: Pentax 105 SD f/9.5. I see you have one too! Great scope.

Yes, great scope and mine (see picture) is even rarer as it has a red metal ring grooved in the dew cap....we know just very few (less than ten?)  were produced and, rumours say, for few people. I don't know how much grounded this story is, but really great performer!

I was lucky to find one a year ago.... 

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#102 ltha

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Posted 07 October 2019 - 09:32 AM

Great find - that is a beautiful telescope! I have owned two of the 105SDs and both were excellent visually. The current one is older than my first. This one has the CI 7x35 finder which is very nice though I prefer the 8x50 I had on the first scope.  A picture of the first one I owned with the 7x50 finder:

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Edited by ltha, 07 October 2019 - 11:25 AM.

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#103 Astroman007

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Posted 08 October 2019 - 07:49 AM

What about the AP Traveler 4" apo? I wanted one, but could not find one anywhere.



#104 Alan French

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Posted 08 October 2019 - 07:59 AM

What about the AP Traveler 4" apo? I wanted one, but could not find one anywhere.

A search reveals they show up fairly regularly on Astromart. 

 

Five so far this year in the classifieds there.

 

Clear skies, Alan


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#105 Astroman007

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Posted 08 October 2019 - 01:00 PM

A search reveals they show up fairly regularly on Astromart. 

 

Five so far this year in the classifieds there.

 

Clear skies, Alan

Thank you Mr. French. smile.gif



#106 Alan French

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Posted 08 October 2019 - 01:16 PM

Thank you Mr. French. smile.gif

You're welcome - good luck! (They will not, of course, be cheap.)

 

Clear skies, Alan


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#107 Astroman007

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Posted 08 October 2019 - 01:23 PM

You're welcome - good luck! (They will not, of course, be cheap.)

 

Clear skies, Alan

I know...next year at the earliest, unless I then decide to go for a new NP-101.

 

Anyway, thanks again!



#108 Alan French

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Posted 08 October 2019 - 01:39 PM

I know...next year at the earliest, unless I then decide to go for a new NP-101.

 

Anyway, thanks again!

A lot of folks are happy with the NP-101is. Not as compact but a fine scope. There's also the CFF 105mm, and a variety of other options. 

 

I see the original NP-101 on the used market occasionally. 

 

Clear skies, Alan


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#109 Lucullus

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Posted 08 October 2019 - 01:54 PM

I understand that grown Fluorit-crystal based lenses are literally second to none concerning low CA. There are not too many but still quite a few refractor models from various brands containing Fluorit lens elements - at least one in doublets or tripletts. They are coupled with some other suitable ED glas I guess. I imagine that an all-Fluorit doublet or triplet would be over the top in optical performance.

Are/were there any all-Fluorit doublet and triplet refractors out there?


Edited by Lucullus, 09 October 2019 - 10:52 AM.


#110 stevep

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Posted 08 October 2019 - 03:10 PM

I have not run across many of these either: Pentax 105 SD f/9.5. I see you have one too! Great scope.

Here's another from the Pentax family that's rarely seen,

 

SteveP1010314.jpg P1010327.jpg


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#111 Lucullus

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Posted 09 October 2019 - 10:54 AM

What about the Vixen 100 VSD f/3.8?



#112 Traveler

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Posted 09 October 2019 - 11:22 AM

Lichtenknecker 6 inch F24

https://www.apm-tele...miapo-refractor

 

don't know the car...grin.gif


Edited by Traveler, 09 October 2019 - 11:22 AM.


#113 LunarObserver

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Posted 09 October 2019 - 11:38 AM

I have a Moonraker 60 mm f/16.7 telescope.  Absolutely beautiful with great images.  Mine is serial number 10 (2015).

David


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#114 Astroman007

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Posted 09 October 2019 - 12:32 PM

I have a Moonraker 60 mm f/16.7 telescope.  Absolutely beautiful with great images.  Mine is serial number 10 (2015).

David

What glass?



#115 Lucullus

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Posted 09 October 2019 - 02:58 PM

I already wondered about Nikon if they ever made telescopes: https://www.apm-tele...-telescope.html

 

And I also never heard of this one from Vixen, according to the tube logo it seems quite a dated one: https://www.apm-tele...white-tube.html

 

Any idea from which decades these two are?


Edited by Lucullus, 09 October 2019 - 02:59 PM.


#116 dscarpa

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Posted 10 October 2019 - 04:30 PM

 My on the way Vixen 130ED SS was billed as ultra rare in the Amart add. None the less it doesn't look nearly as rare as some scopes in this thread. David 


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#117 Esso2112

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Posted 10 October 2019 - 05:35 PM

I already wondered about Nikon if they ever made telescopes: https://www.apm-tele...-telescope.html

 

And I also never heard of this one from Vixen, according to the tube logo it seems quite a dated one: https://www.apm-tele...white-tube.html

 

Any idea from which decades these two are?

Both are likely from the 80’s. The Vixen FL55 is a nice little flourite doublet that is very good from reports I’ve read. Fairly rare, but they come up. Comparable to a Tak FC-50, which is also excellent. 

 

The Nikons are excellent scopes from what I’ve read. Again, not extremely rare. They do always seem to go for a premium, though. 



#118 Lucullus

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Posted 13 October 2019 - 03:55 PM

So Nikon made telescopes. What about Canon? I read they produce the lenses for Takahashi, but what about their own full telescopes?


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#119 gnowellsct

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Posted 16 October 2019 - 10:14 PM

If the glass has rare earth components is it by definition a rare scope?
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#120 Lucullus

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Posted 31 October 2019 - 11:49 AM

Doublets and triplets are probably the most common refractors out there. There are also some Quadruplet models or even Quintuplets. The more lenses the more rare I assume. The Vixen 100 VSD f/3.8 and the Tele Vue-NP127fli have 5 lenses, for example. Can they be counted as rare?



#121 Andreas-TAL

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Posted 02 November 2019 - 06:10 PM

Well, I own an 4”, f/7.5 apochromatic telescope with six lenses - to continue your listing it’s something like a “sext-tublet” and therefore it should be quite rare. But it’s rareness has another reason: The telescope is a prototype model - only a single one was produced.

 

It’s a TAL-100 Apolar telescope from Russia.

 

And .. . it’s a quite good performer: diffraction limited, very good color correction, a small touch of coma (I still tolerate the coma, for collimation of the system is quite difficult), multicoated lenses.

As far as I know a second 4” prototype was produced, but with different lens radiuses and uncoated lenses, too.

 

With the experiences of the pre-series model(s) the 125mm Apolar telescopes were produced, leaving back my single (?) 4” TAL-100 Apolar. So, it should be definitely a quite rare telescope ...

 

C8554F0A-9D61-4695-BC5E-020041973071.jpeg

 

Andreas.TAL


Edited by Andreas-TAL, 02 November 2019 - 06:12 PM.

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#122 PJ Anway

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Posted 03 November 2019 - 08:01 AM

These are the rarest I've owned:

 

Showa SD100mm/1000mm

 

Showa-Tak.jpg

 

 

Zeiss "Presto" 80mm/840mm in custom OTA I built.

According to Baader, only about 30 of these lenses were made by Zeiss in the mid 1990’s. Few made it into OTA's before Zeiss left the amateur telescope market.

 

Zeiss-Presto.jpg


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#123 PJ Anway

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Posted 03 November 2019 - 09:08 AM

Here is the rarest I currently own:

 

Zeiss AS63/840 (predecessor to the Telementor); mine was manufactured in November of 1963 - so it is 56 years old this month!

 

AS63_.jpg


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#124 Lucullus

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Posted 10 February 2020 - 10:21 AM

Concerning the VSD100 f/3.8, I got an answer in an email from Vixen, saying that, while they can't disclose the exact quantity it is produced in small lots to guarantee quality.

Does anyone have this scope and is there a serial number on it?



#125 Hesiod

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Posted 10 February 2020 - 11:40 AM

IMHO the VDS100 is not exactly "rare": I guess that not many have been sold, but as long as it is in Vixen's catalogue it can be purchased quite easily (the worst is to have to wait for a while for it to be delivered).

In fact, having seen one in action, for a while toyed myself with the thought of purchasing one for travels, but after a chat with the vendor dropped such plan as it would have not accomplished the planned goal; the telescope was however readily available.

 

Maybe in a few years after the end of production it will become a "rare" refractor (as are not exactly common its "ancestors", the Pentax SDUFs); however, having been designed almost exclusively as an astrograph, I do not think will hold its value as well as "visual-geared" models, the digital sensors evolving much faster than human eye...




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