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Low range refractor 250mm to 380mm

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#1 Typhoon

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Posted 06 December 2019 - 10:44 AM

Hi,
I would like to know your opinion about this issue.
I have and Fsw106n and I'm looking for a small quality refractor 250mm to 380mm, I have read about Redcat, Ts061, but most of them have some problems with the stars in the borders.
Which tube will be suitable, without problems of "borders", and good for astrophotography?
Thanks!

#2 bobzeq25

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Posted 06 December 2019 - 11:23 AM

This is a popular choice among experienced imagers.  Especially since the Stellarvue 70T (which is what I use) is not available currently.

 

https://williamoptic...ing-refractor-b

 

There's no particular need for this particular version, but you do want the upgraded "II" version.

 

https://optcorp.com/...actor-telescope


Edited by bobzeq25, 06 December 2019 - 11:26 AM.


#3 Eric H

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Posted 06 December 2019 - 11:24 AM

FSQ-85 with .73 reducer/corrector will put you at 327mm and F3.8.


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#4 Typhoon

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Posted 07 December 2019 - 05:56 AM

Thanks for the answers!!
I have read about the WO 71 II, and there are some complains about the "prisma" shape of the stars that have some of them. I don't know if it is a commom issue or is something casual.

Edited by Typhoon, 07 December 2019 - 05:56 AM.


#5 Hesiod

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Posted 07 December 2019 - 05:58 AM

It depends on the sensor's specs, but many brands publish spot diagrams so it is easy to evaluate by yourself.
Anyway, you could give a look to Vixen vsd100 or fl55ss (the latter is especially small and fit for travels), or to Takahashi fsq85

#6 bobzeq25

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Posted 07 December 2019 - 12:33 PM

Thanks for the answers!!
I have read about the WO 71 II, and there are some complains about the "prisma" shape of the stars that have some of them. I don't know if it is a commom issue or is something casual.

No real data.  People complained about it with the original, a lot.  Less so with the II.  It's why I got the SV70T, not available right now.



#7 Typhoon

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Posted 07 December 2019 - 03:47 PM

It looks as WO the level of quality at the end of process is not as good as it should?
Well to sum up:
We have the WO Redcat and WO 71 II that if you are lucky yo should not have any problem.
The gold master Takahashi FSQ 85
Vixen FL55ss
SV70T not available and probably the best choice money/quality
And I have found the TSoptics 61 EDPM Apo 61mm F/4.5, is anyone tell me how it works this tube??
Thanks

#8 Jared

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Posted 07 December 2019 - 05:28 PM

Hi,
I would like to know your opinion about this issue.
I have and Fsw106n and I'm looking for a small quality refractor 250mm to 380mm, I have read about Redcat, Ts061, but most of them have some problems with the stars in the borders.
Which tube will be suitable, without problems of "borders", and good for astrophotography?
Thanks!


What size chip were you hoping to cover?

#9 Typhoon

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Posted 07 December 2019 - 07:11 PM

APS-C

#10 Hesiod

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Posted 08 December 2019 - 04:59 AM

With an aps-c sized sensor you should not have big issues, and it is most a matter of budget.

The Vixen VSD (380mm, ca 300mm with the reducer) is the fastest for this focal length (excluding reflecting astrographs or camera lenses, which could be interesting options as well) but it is rather bulky.

The fsq85 is a bit smaller but has longer focals (450 and 330mm, f/5 to f/3.8) and noticeably slower

The Takahashi Fs60 and Vixen fl55 are imho in the same boat: they trade speed with portability (both are fit for the use with small star trackers as well, but their speed ranges from f/6 to f/4).

Last spring I was searching for a compact travel astrograph and, after some evaluations, picked the Vixen fl55 over the FS60, and so far am really pleased by it.



#11 Simon B

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Posted 08 December 2019 - 12:55 PM

:borg: 55FL, 200mm F3.6 with reducer

 

Guess that's a bit shorter FL than you were looking for, but I thought it was worth a mention anyhow



#12 Typhoon

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Posted 09 December 2019 - 06:33 AM

Thanks again for yours answers.
I'm also considering theTS-Optics TSQ-71ED nice 347mm, I read that has the same elements as WO 71.

#13 GlenM

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Posted 09 December 2019 - 09:36 AM

You could also look at the Sharpstar offerings.

 

Glen.



#14 Typhoon

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Posted 11 December 2019 - 02:54 PM

Thanks for all your helpful answers.
Now I have to consult with the pillow and go deeply investigating all the choices.
Unfortunatly here in the north of spain this year the weather is horrible (no days last november and this december it looks the same),nightmare!!!


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