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Which are the rarest refractors?

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#26 Lucullus

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Posted 06 September 2019 - 04:17 PM

How rare are FrTelescopes and Astro-Optik-Manufaktur refractors?
Are there any oil-spaced ED doublets with f/9 and slower?
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#27 junomike

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Posted 06 September 2019 - 06:00 PM

TeleVue 140 F5


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#28 Richard Whalen

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Posted 06 September 2019 - 06:09 PM

8" and larger AP's



#29 csrlice12

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Posted 06 September 2019 - 06:10 PM

The Nagler reflector....


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#30 Paul G

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Posted 06 September 2019 - 06:22 PM

Apomax 130 mm F/12
Under 30 I think were made
Passed on one in the early nineties
Cool looking scope

 

Had one, great scope, 4 color crossings, but built like a tank (including the objective cover), sold it because it was too long to fit in my car.


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#31 ngc7319_20

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Posted 06 September 2019 - 07:24 PM

The Nagler reflector....

I saw parts for a TeleVue Mak-Newt prototype when visiting one of their suppliers many years ago.  Guess it never took off...



#32 buddy ny

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Posted 06 September 2019 - 09:32 PM

Really!
Wish,I'd seen that
Really wished I'd seen one complete.

I saw parts for a TeleVue Mak-Newt prototype when visiting one of their suppliers many years ago. Guess it never took off...



#33 buddy ny

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Posted 06 September 2019 - 09:42 PM

Had one, great scope, 4 color crossings, but built like a tank (including the objective cover), sold it because it was too long to fit in my car.


Got an new AP 130 late 90's, early 2000's
Posted about it , on the AP. User group. Was contacted by another user
Who wanted a straight up trade. It did look long & super over built
I was tempted. But only had the AP for a day or 2 befor the offer came
Still wished I'd had it for a month or so
Ultimate planetary it seemed

#34 Tyson M

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Posted 06 September 2019 - 11:17 PM

How rare are FrTelescopes and Astro-Optik-Manufaktur refractors?
Are there any oil-spaced ED doublets with f/9 and slower?

CN member donadani has a 100mm f10 refractor.  It is beautiful and I'm super jealous.  One of 25 I think?   Definitely rare.



#35 donadani

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Posted 06 September 2019 - 11:45 PM

reg. Astro Optik Manufaktur

 

105/1000 - oil spaced fluorit triplet - 12 pieces produced

130/1200 - air spaced ED doublet - guess 5 or 6 pieces produced

160/1600 - air spaced ED doublet - 5 pieces produced

180/900 - air spaced ED sixlet - 2 pieces produced (when I remember correct)

 

so definitely rare - when compared to a Tak FC-100N for example from what 100 or so were made ;)


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#36 gnowellsct

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Posted 07 September 2019 - 12:13 AM

There are a lot of “rare” scopes out there. It depends on how many were made and how many of the old ones have survived. I have three scopes that are generally considered rare:

 

Zactly so.  Rare scopes are common.  My f/6.9 92 mm CFF with FPL53 no. 002 is one of only two such scopes made.  It is the Omega.  The Alpha is owned by Dave P., a CN member.  


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#37 Traveler

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Posted 07 September 2019 - 01:44 AM

This Royal Astro Optical 76mm F15 refractor isn't rare, but this complete kit is -- only 6 are known to exist:  1964 Sears Model 6336 Professional-type Motorized Observatory

 

attachicon.gif P19 - Full Right Side CN2.jpg

 

There are hundreds of these RAO OTAs out there, re-branded by Mayflower, Sans & Streiffe, Sears, Tasco, and Royal.  I can't recall reading any negative posts about their optical quality.  The lens in my 6336 has a near-perfect DPAC pattern.

 

And, it just looks so cool standing in my man cave.

What an elagance,  magnificent!

Are the wheels original as well?



#38 Sasa

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Posted 07 September 2019 - 02:57 AM

Of course mine... I commissioned only one lens to be made

 

IMG_3773a.jpg


Edited by Sasa, 07 September 2019 - 02:57 AM.

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#39 Bomber Bob

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Posted 07 September 2019 - 08:03 AM

I used to own a D&G 5" F10 achro.  It was one of their first custom orders; and, back in 1988, their "production" models were F12.  Barry tried to talk me into the F12, but I wanted to keep the length & weight down for the mount I had at the time.



#40 Chris Cook

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Posted 07 September 2019 - 08:05 AM

Astro-Physics 10" f14 tri-space installed at the Rockford Amateur Astronomers Lockwood Park Observatory.  Doublet with a three element corrector.  Written up in the Oct 1985 issue of S&T.  Only one ever made by RC afaik.


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#41 Chris Cook

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Posted 07 September 2019 - 08:06 AM

Link to article: https://archive.org/...ge/n83/mode/2up


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#42 jag767

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Posted 07 September 2019 - 08:10 AM

1 of 1. 35mm cooke triplett.

 

Rare does not mean valuable lol.gif

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#43 cleggm1

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Posted 07 September 2019 - 09:44 AM

Apomax 130 mm F/12
Under 30 I think were made
Passed on one in the early nineties
Cool looking scope

Apomax 132mm f/12....only 23 made back in the 1990's.  Photo of mine built in 1996. Still used regularly. 

 
Apomax NJP 01
IMG 8958
IMG 9012

 

 


Edited by cleggm1, 07 September 2019 - 10:22 AM.

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#44 Blueox4

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Posted 07 September 2019 - 09:48 AM

How about the 2 earlier Stowaway runs. I wonder how many f/5 and f/7 Stowaways were made. I saw somewhere around 55-75 of the F/7’s but I don’t know if that’s correct. There must be fewer of those already than the newer Stowaway. 


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#45 Lucullus

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Posted 08 September 2019 - 03:24 PM

There are a lot of “rare” scopes out there. It depends on how many were made and how many of the old ones have survived. I have three scopes that are generally considered rare:

1) Brandon 130 (100 made with AP triplet)
2) Tak FCT-125 w/ original reducer
3) Original AP Stowaway f5

Others just seem rare since they don’t get sold as often and people hang on to them.

Agreed, good points.

 

Initially, I had in mind only refractors which were produced in small amounts; I am most interested in this aspect of rareness.

 

The first refractor built by galileo?

Good point, too. Also the Yerkes 40" post. Thus, I rephrase my initial question such that we focus on the time after 1960. [Addendum: and with excellent optical performance.]

 

 Zeiss APQ apochromats are expensive but not very rare. In fact I have seen them many times.

 

I think the degree of rareness depends on the geography/location. So i think a scope can be rare in the US but doesn't have to be rare in Europe or for example in Japan.

I meant globally.


Edited by Lucullus, 08 September 2019 - 04:26 PM.


#46 Bomber Bob

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Posted 08 September 2019 - 04:02 PM

Thus, I rephrase my initial question such that we focus on the time after 1960.

 

Okay.  If you ask this question over on the Classics Forum, you'll get a ton of responses.  The 1960s were a Golden Age for Japanese imports, and it's important to distinguish between the makers (lots of collaborations between Japanese companies) and the importers.

 

I have 3 rare to very rare Japanese refractors sold by USA importers:

 

- Sears Model 6336:  Exported by Royal Astro Optical, Ltd. Tokyo, this is the 76mm F15 EQ on a tall pedestal.

- Hy-Score Model 452:  This is a Goto "school scope" 60mm F20 EQ, with an unusual Steinheil contact doublet.

- Hy-Score Model 457:  This is another Royal Astro 50mm F10 on an unusual alt/az mount.

 

All 3 were made on or before Takahashi began to market refractors under their own brand.  I maintain a Registry of Classic Japanese scopes.  It's not all-inclusive, but looking at the relative numbers, there are many other rare refractors in the hands of CN Members -- like the Tasco 20TE, or the Sears Model 6345.  It's too bad the deep recession of the 1970s & the global market shifts put companies like Royal out of business -- they made great fracs!


Edited by Bomber Bob, 08 September 2019 - 04:04 PM.


#47 Lucullus

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Posted 08 September 2019 - 04:23 PM

Thus, I rephrase my initial question such that we focus on the time after 1960.

 

Okay.  If you ask this question over on the Classics Forum, you'll get a ton of responses.  The 1960s were a Golden Age for Japanese imports, and it's important to distinguish between the makers (lots of collaborations between Japanese companies) and the importers.

 

I have 3 rare to very rare Japanese refractors sold by USA importers:

 

- Sears Model 6336:  Exported by Royal Astro Optical, Ltd. Tokyo, this is the 76mm F15 EQ on a tall pedestal.

- Hy-Score Model 452:  This is a Goto "school scope" 60mm F20 EQ, with an unusual Steinheil contact doublet.

- Hy-Score Model 457:  This is another Royal Astro 50mm F10 on an unusual alt/az mount.

 

All 3 were made on or before Takahashi began to market refractors under their own brand.  I maintain a Registry of Classic Japanese scopes.  It's not all-inclusive, but looking at the relative numbers, there are many other rare refractors in the hands of CN Members -- like the Tasco 20TE, or the Sears Model 6345.  It's too bad the deep recession of the 1970s & the global market shifts put companies like Royal out of business -- they made great fracs!

Well, starting in the 60ies, but by far not restricted to that time...

I believe to have read that reputable refractors were also increasingly entering the market in the late 80ies to the 2000 years. So no need to keep it entirely in the Classics Forum. I just wrote 1960 in case there have been legends like the TEC140, Tak or AP apo refractors around then that might have been seldom, also due to their optical performance and global production numbers.



#48 gnowellsct

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Posted 08 September 2019 - 08:18 PM

Thus, I rephrase my initial question such that we focus on the time after 1960.

 

 

Well you order practically any CFF scope it is going to be one of ten or twenty.  And as I mentioned my CFF 92 f/6.9 with FPL 53 is one of two ever made.  Even if some day they knock out a few more (no plans for that currently) it will still be a pretty scarce item.

 

Rarity and "sought after" are not always the same thing.  There's a lot of nostalgia around the 1960s Japanese skinny achro refractors.  That makes a market.

 

Greg N



#49 Bomber Bob

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Posted 08 September 2019 - 08:46 PM

There are also some rare quality skinny refractors from the Classic category, too.  Sometimes rare in this group means few were made; but it also can mean that few have survived to the present.  I suppose that if a refractor is expensive enough, it will also be a rarity.  Lots of definitions / criteria for rare.



#50 Darren Bly

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Posted 08 September 2019 - 08:50 PM

How about the AP 7" f/7. I believe there were less the 20 of them.


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