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4 inch sub f7 apos? 2 only?

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18 replies to this topic

#1 Darren Drake

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Posted 03 November 2019 - 12:02 PM

I am only aware of 2 such scopes.  The AP Traveler and the Vixen ED102SS.  Am I missing any others?  Thanks..



#2 25585

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Posted 03 November 2019 - 12:17 PM

Tele Vue NP101, Takahashi FSQ106


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#3 MrRoberts

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Posted 03 November 2019 - 12:20 PM

Sky Watchers Esprit 100 (F 5.5)


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#4 John O'Grady

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Posted 03 November 2019 - 12:25 PM

Vixen VSD100 astrograph at f/3.8


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#5 evan9162

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Posted 03 November 2019 - 12:30 PM

Orion Eon 110 (F/6) - yes, a bit big

TS Photoline 107 F/6.5

TS Imaging Star 102 F/5.1

TS Imaging Star 100 F/5.8

APM Super 107 F/6.5 (maybe the same as above)

APM LZOS 105 F/6.2

CFF 105 F/6

Vixen 100 F/3.8

Tak FSQ106 F/5

Borg 107 F3.9 (maybe not a true APO)


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#6 Tyson M

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Posted 03 November 2019 - 12:41 PM

Lots of available choice here listed above, just depends on budget and priorities on usage under the stars. 



#7 junomike

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Posted 03 November 2019 - 02:38 PM

WO 98 F6.2

ES 115 F5.5 (currently on sale!)



#8 Winks

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Posted 03 November 2019 - 06:30 PM

Tak FS-102



#9 Winks

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Posted 03 November 2019 - 06:32 PM

Sorry, that's f/8



#10 Esso2112

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Posted 04 November 2019 - 09:00 AM

Tak FCT-100 f6.4.

#11 MrGrytt

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Posted 04 November 2019 - 12:46 PM

TEC 110FL f/5.6


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#12 Simon B

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Posted 05 November 2019 - 02:15 AM

Borg 101ED F6.3

Pentax 100 SDUF F4



#13 Kon Dealer

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Posted 05 November 2019 - 01:27 PM

Kson 102ED f/6. 

Yes, some colour on very bright objects, but a very good all-rounder and travel scope.



#14 OldManSky

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Posted 06 November 2019 - 06:18 AM

William Optics ZS 103 f/6.9, GT102 f/6.9...



#15 edif300

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Posted 06 November 2019 - 06:34 AM

Pentax 105 SDHF

Pentax 105 SDP

#16 Jeff Morgan

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Posted 06 November 2019 - 03:33 PM

Canon FD 300 L @ f/2.8.

 

IMG_1132.jpg
 
IMG_1130.jpg
 

And it is fluorite! Requires a rather large star diagonal though.

 

IMG_2642.jpg

 


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#17 Littlegreenman

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Posted 07 November 2019 - 12:10 AM

That Canon might be a bargain on the used market. How is it for astronomy?



#18 Orogeneza

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Posted 07 November 2019 - 01:41 PM

Zeiss APQ 100/640 (F6.4)



#19 Jeff Morgan

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Posted 07 November 2019 - 04:05 PM

That Canon might be a bargain on the used market. How is it for astronomy?

 

 

I paid $800 for mine, probably overpaid slightly - based on telephoto manual focus market. But where else are you going to get a 4" f/2.8 fluorite refractor with famous name Japanese optics? On that basis, $800 was a steal.

 

Phenomenal for astronomy - if you can mount it. Too heavy and too much magnification for hand-held use. About 5 pounds IIRC.

 

The first challenge is an adapter for the telephoto mount. I had it easy here, my NVD has a C-mount and these adapters are common, only about $20.

 

For conventional astro eyepieces, Precise Parts can help you with a Canon (or Nikon) to 2" or T2 thread. Specify the minimum thickness on the adapter since telephotos don't have much flange to focal plane distance to play with:

 

https://en.wikipedia..._focal_distance

 

Just add a Baader Click Lock collar and you should be in business.


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