Jump to content

  •  

CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.

Photo

Looking at one of two refractors to companion my Binoculars

  • Please log in to reply
8 replies to this topic

#1 Dakota1

Dakota1

    Apollo

  • *****
  • topic starter
  • Posts: 1,195
  • Joined: 18 Oct 2010
  • Loc: Burson, Ca.

Posted 10 December 2019 - 10:48 PM

Not to far off around the first of Feb 2020 I am going a small refractor scope to be a companion to my Oberwerk 20 X 80 Deluxe III. I am looking at two refractors one is 

the Celestron  NexStar 102SLT go to set up. The second one is a Sky Watcher Star Travel  120 mm F/5  on a manual tripod which is OK with me. there are times I

wish I had a refractor to look deeper than the binos. I had many refractors and reflectors over time. I did kept all my eye  pieces when I sold all my scopes due to major

back problems and a hip replacement . I am restricted lifting heavy scopes so all the SCTs and large Refractors were gone. I am almost 80 years young and these

lite weight scopes will not be a problem.

I am looking for feed back on these two scopes as to Pros & Cons if any on there performance?

 

Thank you  Bill


Edited by Dakota1, 10 December 2019 - 10:56 PM.


#2 SeattleScott

SeattleScott

    Cosmos

  • *****
  • Posts: 8,786
  • Joined: 14 Oct 2011

Posted 11 December 2019 - 07:54 AM

Well the 120 will go a bit deeper, but it is also blazing fast, so it is mainly just a low power scope. The 102 won’t go dramatically deeper, but it should allow you close to 100x without considerable image breakdown. More of a low-medium scope instead of a low power specialist. And there is GoTo versus manual.

With these scopes CA will be the limiting factor so it isn’t like you would choose one or the other for better optical quality. It is really just a question of how much CA you can tolerate. I understand you are “middle aged” and can’t haul out big scopes anymore, and going down to F5 allows you to carry a bit larger aperture scope. But it also ramps up the false color. You just have to decide where the cutoff is. Your binoculars are probably F5 so you know they can provide nice views, at 20x or so.

Scott

#3 25585

25585

    Cosmos

  • *****
  • Posts: 9,884
  • Joined: 29 Aug 2017
  • Loc: In a valley, in the UK.

Posted 11 December 2019 - 09:29 AM

My first refractor was a 100mm F5 Tele Vue Genesis. Still my best companion to binos of 70mm. 100x mag is OK for CA.  



#4 earlyriser

earlyriser

    Surveyor 1

  • *****
  • Posts: 1,862
  • Joined: 08 Nov 2016
  • Loc: Cincinnati

Posted 11 December 2019 - 09:40 AM

I have a pair of 20X80 Oberwerk LW binoculars. I've found that having a telescope set up with an eyepiece that provides 40X to 60X is nice when I want to zoom in on something I see in the binoculars. Usually, my C6 on the Porta-II fills this role. In your case, I think either scope would work for that, but I'd go with the 120 to maximize light gathering power and because I mainly do deep-sky, not planets or lunar observing, so CA isn't really a problem for me.


  • 25585 likes this

#5 erin

erin

    Viking 1

  • *****
  • Posts: 843
  • Joined: 27 Jan 2018
  • Loc: MA

Posted 11 December 2019 - 09:41 AM

I had an Orion 100mm f6 and enjoyed it for DSO. It would have been a great companion to binoculars, but if I were starting over I would opt for the 120mm for those extra stars. 



#6 sg6

sg6

    Cosmos

  • *****
  • Posts: 8,774
  • Joined: 14 Feb 2010
  • Loc: Norfolk, UK.

Posted 11 December 2019 - 09:55 AM

The 120 has the advantage of aperture, the 102 the advantage of being a bit slower.

I would prefer the slower and so smaller aperture, I would rather have a scope around f/8 for either.

My 102/600 has a bit too much color but that is after use of a couple of ED's and apo's.

 

I would myself avoid a 120 f/5 achro. Although an 8mm eyepiece is 75ish and might be reasonable.

 

Could you dig out a 120/1000 and would the size be a problem, as well as the likely additional cost.



#7 Dakota1

Dakota1

    Apollo

  • *****
  • topic starter
  • Posts: 1,195
  • Joined: 18 Oct 2010
  • Loc: Burson, Ca.

Posted 11 December 2019 - 11:40 AM

Thanks for the feed back greatly appreciated

 

Bill


  • erin likes this

#8 bobhen

bobhen

    Skylab

  • *****
  • Posts: 4,444
  • Joined: 25 Jun 2005

Posted 11 December 2019 - 02:07 PM

I think the 120 F5 (which a lot of people love including me when I had one) is the better companion to your binoculars.

 

With these wide-field, low power scopes, a manual mount is all you need.

 

These fast achromats are not the best for the moon and planets but they can certainly be used for casual looks.

 

I’ve owned a 102mm F5 achromat for 15 years.

 

Bob



#9 tony_spina

tony_spina

    Mercury-Atlas

  • *****
  • Posts: 2,944
  • Joined: 14 Jun 2004
  • Loc: So. Cal.

Posted 11 December 2019 - 07:34 PM

I agree the ST120 is a great companion to binoculars 




CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.


Recent Topics






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics