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Fluorite Refractors

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#1 BillP

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Posted 29 June 2015 - 08:55 AM

Was wondering what refractors old and new use Fluorite elements in them?  The ones below are the commonly known list.  Please let me know if you know of more.

 

Current Production

Takahashi FC Series 76/100/250

Takahashi FCT Series 250

Takahashi FS Series 60
TEC 180

 

Discontinued

Orion FL 80/102
Vixen FL 80/102
Takahashi FC Series 50/60/100
Takahashi FCT Series 100/150/200

Takahashi FS Series 78/102/128/152
Tele Vue SDF 101


Edited by BillP, 30 June 2015 - 09:18 AM.


#2 Erik Bakker

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Posted 29 June 2015 - 09:12 AM

Bill,

 

These "out of production" models from the top of my mind:

 

Vixen/Celestron

FL55 S

FL70 S

FL80 S

FL90 S

FL102 S

 

Takahashi

FC76

FC90

FC125

FC150

 

FCT65

FCT76

FCT125 

 

FSQ106

FSQ106 N

 

FC-L "Sky" 90

 

Zeiss 

APQ 100/640  

APQ 100/1000

APQ 130/1000

APQ 150/1200

 

Astro-Physics Stowaway 92 f/4.9

 

TEC 160FL

TEC 110FL


Edited by Erik Bakker, 29 June 2015 - 09:18 AM.


#3 Far Star

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Posted 29 June 2015 - 09:16 AM

Baader Travel Companion:

 

http://www.baader-pl...dex.htm#english

 

 

 



#4 vahe

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Posted 29 June 2015 - 09:17 AM

TEC 110
TEC 160
TEC 200
Aries 7” F/8
Tak 200

Vahe

#5 jrbarnett

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Posted 29 June 2015 - 09:22 AM

Was wondering what refractors old and new use Fluorite elements in them?  The ones below are the commonly known list.  Please let me know if you know of more.

 

Current Production

Takahashi FC Series 76/100/250

Takahashi FCT Series 250

Takahashi FS Series 60
Takahashi FSQ Series 85/106/130
TEC 180

 

Discontinued

Orion FL 80/102
Vixen FL 80/102
Takahashi FC Series 50/60/100
Takahashi FCT Series 100/150/200

Takahashi FS Series 78/102/128/152
Tele Vue SDF 101

http://www.apm-teles...auf-Sideres.jpg

 

http://www.takahashi.../en/FET-300.php

 

http://images1.optic...or-sv90t-01.jpg

 

- J



#6 Far Star

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Posted 29 June 2015 - 09:25 AM

Borg 67/300 FL

Borg 71/400 FL

Borg 90/500 FL

 

http://www.aokswiss.ch/index_tel.html

 


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#7 Bill Barlow

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Posted 29 June 2015 - 09:26 AM

There was the Stellarvue 90TBV fluorite triplet that was discontinued about 5 years ago.  

 

Bill



#8 AustinAstronomer

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Posted 29 June 2015 - 10:38 AM

I don't think the TEC APO160FL is "out of production."  The TEC website stills lists it for sale.  And, to my knowledge, Yuri Petrunin has never said that it has been discontinued.



#9 Derek Wong

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Posted 29 June 2015 - 11:03 AM

I am combining the posts for convenience and adding and subtracting a few things.  The bold means "in production" but some may be sold out or one offs:

 

Fluorite Scopes:

 

APM - Custom built scopes including 304mm f/8

 

Aries 127mm f/6.9, 6" f/9, 7" f/8 and other triplets, 178 f/8, 356mm f/9 and f/12 (and probably anything in between) doublets

 

Astro-Physics 92mm f/4.9 Stowaway triplet

 

Baader  95/560 Travel Companion triplet

 

Borg 50/400, 55/250, 67/300, 71/400, 90/500 doublets

 

Burgess 91/700 doublet

 

Showa 100/1000 doublet http://www.astromart...ified_id=114368

 

Stellarvue 90/630 triplet

 

Takahashi FC 50, 60, 65, 76, 100, 100N, 125, 150 doublets
        FCL 90 doublet
        FCT 65, 76, 100, 125, 150, 200, 250 triplets
        FET 200, 300 triplet
        FS 60C, 78, 102, 128, 152 doublets
        FSQ 106 or 106N Petzvel

        TS 90

 

TEC  110FL, 160FL, 180FL, 200FL, 250VT triplets

 

Vixen FL series (sometimes Celestron or Orion) - 55, 70, 80, 90, 102 doublets

 

Zeiss APQ 100/640, 100/1000, 130/1000, 150/1200 triplets

 

Other Scopes:

 

Adcock fluorite 100/1200 doublet

http://www.iceinspac...ad.php?t=121073

Some controversy as to whether this was actually an ED lens

 

Televue Genesis Petzvel - had fluorite rear element but not in main objective

 

TMB - some very early models originally designed with fluorite but production models used OK4

 

William Optics - advertised as fluorite but most were FPL-53 or had LZOS lenses with OK4

 

Prototypes, one offs or rumored scopes:

 

APM 6" f/6

http://www.astromart...ified_id=336188

 

Borg 107/600 concept
https://digiborg.wor...20/cp-in-japan/

 

GOTO 80/1200 fluorite doublet
http://www002.upp.so.../hosi1.4x8e.htm

 

Zeiss APQ prototypes 80/500, 105/800, 110/840, 200/2000 triplets
          AQ prototype 100/1000 doublet
http://www.astromart...&news_id=&page=

 

Derek


Edited by Derek Wong, 01 July 2015 - 03:29 PM.

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#10 BillP

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Posted 29 June 2015 - 11:06 AM

WoW :bigshock:   So many!!



#11 Jon Isaacs

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Posted 29 June 2015 - 11:16 AM

Derek:

 

I believe the William optics scopes that were advertised as Fluorite were actually FPL-53.  I have one and that is what WO told me.

 

I believe the Televue Petzvals that used Fluorite did not have it in the objective, it was in the rear Petzval elements, I do not think of them as being "true" Fluorite scopes...

 

They say that if you clean your objective three times a day with Crest, it will last longer, have fewer cavities and provide cleaner, brighter views.. :lol:

 

Jon


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#12 doctordub

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Posted 29 June 2015 - 11:25 AM

:funny:

CS

Jonathan



#13 Scott99

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Posted 29 June 2015 - 11:30 AM

mmmmm, I want every one!  So, if I'm reading this correctly, the TEC250's being made as we speak are tied with Tak's 250mm monster for the biggest?  

 

one of the TEC customers needs to emerge and invite us over for a quality check!    :bow:


Edited by Scott99, 29 June 2015 - 11:31 AM.


#14 Stephen Kennedy

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Posted 29 June 2015 - 11:50 AM

According to Jim's post with a link, there is a Takahashi FET 300 refractor with an aperture of 300 mm.  There is a picture of it on a huge GEM.  The OTA is listed as having a mass of 150 kg.  To buy one I would probably have to sell my house and I live in California. 



#15 Derek Wong

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Posted 29 June 2015 - 12:19 PM

Derek:

 

I believe the William optics scopes that were advertised as Fluorite were actually FPL-53.  I have one and that is what WO told me.

 

I believe the Televue Petzvals that used Fluorite did not have it in the objective, it was in the rear Petzval elements, I do not think of them as being "true" Fluorite scopes...

 

They say that if you clean your objective three times a day with Crest, it will last longer, have fewer cavities and provide cleaner, brighter views.. :lol:

 

Jon

 

Hi Jon:

 

The stuff about William Optics is the same that I heard.  Some of the early scopes had LZOS optics.  From reading the TMB group, these were thought to be fluorite, but then the design was changed to OK4.  Various people thought that the first few lenses were fluorite, but later posts dispute this.

 

Do you know if the APOGRADE lenses in WO tubes were actually not fluorite?

 

I will put these things in a separate section.

 

Derek



#16 Jon Isaacs

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Posted 29 June 2015 - 12:55 PM

 

Derek:

 

I believe the William optics scopes that were advertised as Fluorite were actually FPL-53.  I have one and that is what WO told me.

 

I believe the Televue Petzvals that used Fluorite did not have it in the objective, it was in the rear Petzval elements, I do not think of them as being "true" Fluorite scopes...

 

They say that if you clean your objective three times a day with Crest, it will last longer, have fewer cavities and provide cleaner, brighter views.. :lol:

 

Jon

 

Hi Jon:

 

The stuff about William Optics is the same that I heard.  Some of the early scopes had LZOS optics.  From reading the TMB group, these were thought to be fluorite, but then the design was changed to OK4.  Various people thought that the first few lenses were fluorite, but later posts dispute this.

 

Do you know if the APOGRADE lenses in WO tubes were actually not fluorite?

 

I will put these things in a separate section.

 

Derek

 

 

Derek:

 

This is my understanding:  I believe they never used Fluorite, the 80mm F/6's were OK-4... The APOGRADE used the same objective as my 80mm Megrez II FD.. it says Fluorite on the objective cell but it's actually FPL-53.. 

 

There is a long thread on Astromart discussing all this, Floyd Blue had the triplet and was not pleased to discover it was not Fluorite..  

 

Jon



#17 doctordub

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Posted 29 June 2015 - 02:26 PM

If you have access to one, you can always do the green laser test. the FPL-53 lense is glass and the beam will be visible because of scatter. The Fluorite lens is crystal, there is minimal scatter so the beam is not visualized.

CS

Jonathan



#18 GShaffer

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Posted 29 June 2015 - 02:42 PM

Derek:
 
I believe the William optics scopes that were advertised as Fluorite were actually FPL-53.  I have one and that is what WO told me.
 
I believe the Televue Petzvals that used Fluorite did not have it in the objective, it was in the rear Petzval elements, I do not think of them as being "true" Fluorite scopes...
 
They say that if you clean your objective three times a day with Crest, it will last longer, have fewer cavities and provide cleaner, brighter views.. :lol:
 
Jon

 
Hi Jon:
 
The stuff about William Optics is the same that I heard.  Some of the early scopes had LZOS optics.  From reading the TMB group, these were thought to be fluorite, but then the design was changed to OK4.  Various people thought that the first few lenses were fluorite, but later posts dispute this.
 
Do you know if the APOGRADE lenses in WO tubes were actually not fluorite?
 
I will put these things in a separate section.
 
Derek


I have one of the APOGRADE lenses installed in a StellarVue Nighthawk OTA.....it was claimed to be a fluorite lens but who knows? I do know it works quite well and is my favorite small refractor I have owned.....
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#19 GJJim

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Posted 29 June 2015 - 04:36 PM

I have one of the APOGRADE lenses installed in a StellarVue Nighthawk OTA.....it was claimed to be a fluorite lens but who knows? I do know it works quite well and is my favorite small refractor I have owned.....

 

A green laser pointer will quickly show if the element is fluorite, or fluoro-crown glass.



#20 GShaffer

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Posted 29 June 2015 - 05:16 PM

I have one of the APOGRADE lenses installed in a StellarVue Nighthawk OTA.....it was claimed to be a fluorite lens but who knows? I do know it works quite well and is my favorite small refractor I have owned.....

A green laser pointer will quickly show if the element is fluorite, or fluoro-crown glass.


I am guessing that might be so if one knew what they are looking for and how to interpret what they see.....without that I doubt it :)

#21 LewisM

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Posted 29 June 2015 - 05:19 PM

Bill, you seem to be crossing over true Fluorite crystal (CaF2) and FPL-53, which is merely fluorite enriched glass.

 

For instance, the FSQ-85, FSQ-106 ED's and FSQ-130 are all FPL-53. Takahashi went away from true fluorite for a while and brought out FPL53 replacements or new models: TSA series, TOA series and the New Q's. These are NOT true fluorite telescopes.

 

Shame. They claim BETTER, I disagree, as obviously MANY do seeing they brought back a line of TRUE fluorites. The market demands it. FPL-53 is GOOD, but it can't QUITE match fluorite in some ways (yet FPL53 is better than flurotie in other ways)


Edited by LewisM, 29 June 2015 - 05:23 PM.

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#22 Jon Isaacs

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Posted 29 June 2015 - 05:50 PM

 

 

I have one of the APOGRADE lenses installed in a StellarVue Nighthawk OTA.....it was claimed to be a fluorite lens but who knows? I do know it works quite well and is my favorite small refractor I have owned.....

A green laser pointer will quickly show if the element is fluorite, or fluoro-crown glass.

 


I am guessing that might be so if one knew what they are looking for and how to interpret what they see.....without that I doubt it :)

 

 

Sent an email to William Optics. I think you will find that your "Fluorite" objective uses FPL-53...I have yet to hear of a WO scope the actually used CaF2 and I have following this story for about 10 years.

 

Jon



#23 GShaffer

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Posted 29 June 2015 - 06:04 PM

I have one of the APOGRADE lenses installed in a StellarVue Nighthawk OTA.....it was claimed to be a fluorite lens but who knows? I do know it works quite well and is my favorite small refractor I have owned.....

A green laser pointer will quickly show if the element is fluorite, or fluoro-crown glass.


I am guessing that might be so if one knew what they are looking for and how to interpret what they see.....without that I doubt it :)

 
Sent an email to William Optics. I think you will find that your "Fluorite" objective uses FPL-53...I have yet to hear of a WO scope the actually used CaF2 and I have following this story for about 10 years.
 
Jon


Guess you missed my implication above that I don't really care, I just know it works great :)

#24 Jon Isaacs

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Posted 29 June 2015 - 06:12 PM

 

 

 

 

I have one of the APOGRADE lenses installed in a StellarVue Nighthawk OTA.....it was claimed to be a fluorite lens but who knows? I do know it works quite well and is my favorite small refractor I have owned.....

A green laser pointer will quickly show if the element is fluorite, or fluoro-crown glass.

 


I am guessing that might be so if one knew what they are looking for and how to interpret what they see.....without that I doubt it :)

 

 
Sent an email to William Optics. I think you will find that your "Fluorite" objective uses FPL-53...I have yet to hear of a WO scope the actually used CaF2 and I have following this story for about 10 years.
 
Jon

 


Guess you missed my implication above that I don't really care, I just know it works great :)

 

 

Greg: 

 

I can't really judge your interest level other than the fact that you made the effort to write a post about it. I can assure you that whatever your interest level is, your objective is FPL-53..

 

Jon



#25 LewisM

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Posted 29 June 2015 - 06:15 PM

As far as I am aware NO Chinese manufacturer has made fluorite objectives. Period.

 

Marketing hype calls them fluorite, which is stretching the point just a tad :)

 

FPL-53 is GOOD. CaF2 is BETTER.


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