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Favorite scopes for doubles

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45 replies to this topic

#26 JimP

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Posted 03 September 2021 - 08:58 AM

944F9810-E0AF-4AFC-83CD-3DC8C07EAD02.jpeg

 

AP 155 F/7.

 

 


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#27 Voyager 3

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Posted 03 September 2021 - 10:09 AM

A bit off topic ,
But Jim , do you use Binoviewer for doubles ? I've seen mixed reactions from folks using bver's for double stars .

PS : nice sunset !
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#28 dhkaiser

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Posted 03 September 2021 - 10:20 AM

attachicon.gif7317E147-1977-450E-8332-19E9057C25E4.jpegHere is my TMB 8” F/9. AP 130 F/8.35 in the background. 

 

JimP

Envious!



#29 JimP

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Posted 03 September 2021 - 02:02 PM

Actually, I do not use Binoviewers for doubles. Photo of the TMB 8” was made while viewing the Moon. I like Binoviewers very much while observing the moon and planets but, I don’t prefer to use  one for double stars.

JimP


Edited by JimP, 03 September 2021 - 02:06 PM.

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#30 icomet

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Posted 05 September 2021 - 04:06 PM

It's faster to just grab the 10" f/6 Swayze dob, but I like using the "anti-refractor" for doubles (6" f/10
Ed Beck Newt. w/ rotating rings on a GOTO mount). 

 

All this will probably change when the parts come in to complete the 12.5" f/8 1967 Cave/Lockwood

scope.

 

Clear Skies


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#31 icomet

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Posted 13 September 2021 - 07:56 PM

I decided to put together a 10" f/7.5 split tube dob for double stars.

 

Hope I can get it balanced and not run out of room. Base was made for a

different focal length.

 

Just add weight if necessary.

 

Clear Skies.

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  • 10 inch f_7.5 split dob.jpg

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#32 Starobserver

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Posted 14 September 2021 - 05:52 AM

I do my double star observing with my 6 and 12 inch newtonians. My favorite however is my 6 inch f5 mounted on an alt-azimuth mount. Personally I think that newtonians are highly underestimated when it comes to observing double stars. 

 

 

DSCF3506.jpeg

 

DSCF3508.jpeg

 

 


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#33 icomet

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Posted 14 September 2021 - 11:19 AM

I do my double star observing with my 6 and 12 inch newtonians. My favorite however is my 6 inch f5 mounted on an alt-azimuth mount. Personally I think that newtonians are highly underestimated when it comes to observing double stars. 

 

 

attachicon.gifDSCF3506.jpeg

 

attachicon.gifDSCF3508.jpeg

 

Correct.

 

Clear Skies.

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  • 6_ blue sm.jpg

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#34 BuffaloTri

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Posted 15 September 2021 - 04:12 PM

I prefer to use my TSA102 over the 18" Zambuto.  A double star at the limit of the big telescope looks a lot like a double star at the limit of the small telescope.  The main difference is that I may see a diffraction ring in the Tak, but my skies will never support a magnification high enough to show one in the big dob.  I get some satisfaction from splitting a very close double, but I mainly view doubles for aesthetic reasons.


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#35 icomet

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Posted 15 September 2021 - 04:14 PM

10" f/7.5 stuffed into the dob base that was for the split tube 10" f/6.

Bottom of OTA from the f/6, and the top of the OTA is the OTA from a binoviewer scope, f/4.7.

 

Clear Skies.

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  • 10 inch f_7.5 star splitter.jpg

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#36 DAVIDG

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Posted 16 September 2021 - 01:38 PM

 My favorite is my  4.25"  f/27  homemade Schiefspeigler. No central obstruction,  all reflective optics so no  chromatic aberration so  true colors on the stars ,  a long focal length so I can get to high power with simple optical eyepieces with long eye relief and the OTA is less then 3 feet long so easy to mount and transport.

 

                 - Dave 

 

                 

 

     meandmyschief.jpg              


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#37 Voyager 3

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Posted 16 September 2021 - 11:30 PM

I prefer to use my TSA102 over the 18" Zambuto.  A double star at the limit of the big telescope looks a lot like a double star at the limit of the small telescope.  The main difference is that I may see a diffraction ring in the Tak, but my skies will never support a magnification high enough to show one in the big dob.  I get some satisfaction from splitting a very close double, but I mainly view doubles for aesthetic reasons.

How frequently do you use your 18" for double stars ? 



#38 Bigzmey

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Posted 17 September 2021 - 12:06 PM

I prefer to use my TSA102 over the 18" Zambuto.  A double star at the limit of the big telescope looks a lot like a double star at the limit of the small telescope.  The main difference is that I may see a diffraction ring in the Tak, but my skies will never support a magnification high enough to show one in the big dob.  I get some satisfaction from splitting a very close double, but I mainly view doubles for aesthetic reasons.

Same hear, seeing rarely gets good enough for a large scope, so most of my sessions are with 4" frac.



#39 BuffaloTri

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Posted 17 September 2021 - 12:35 PM

How frequently do you use your 18" for double stars ? 

I don't ever setup the 18" specifically for doubles, but I look at some doubles every time I use the big telescope.  So I guess the answer is either never or often, depending on your point of view. :)

 

That said, there is no doubt that the big telescope is more capable of splitting doubles than the smaller refractor.  My old challenge doubles are all trivial with the big dob.


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#40 Voyager 3

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Posted 17 September 2021 - 12:47 PM

Good answer :-) .

#41 pez_espada

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Posted 17 September 2021 - 03:11 PM

My Carton 100 F13.



#42 pez_espada

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Posted 17 September 2021 - 03:12 PM

My Carton 100 F13.

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Edited by pez_espada, 17 September 2021 - 03:14 PM.

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#43 Rutilus

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Posted 18 September 2021 - 04:33 AM

My Carton 100 F13.

 

I have a Carton 100mm f/13, it's a very nice piece of glass.

For me it's refractors all the way. Nowadays I can not use Newtonian reflectors

due to a medical problem. I have a SCT and used maks but don't like the diffraction

pattern that they produce. Here is my Carton lens in ATM tube.

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#44 JimOfOakCreek

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Posted 18 September 2021 - 01:38 PM

I love my Stellarvue 4" APO!

 

B876454A-E734-45F6-AE07-E8AB140C8AF3.jpeg


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#45 NC Startrekker

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Posted 18 September 2021 - 02:39 PM

Very nice setup Jim. BTW - is that a Berlebach accessory tray you are using on your T-pod?  How did you mount it?



#46 Scott Beith

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Posted Yesterday, 07:07 PM

I really appreciate my refractors for double stars. Their excellent image quality helps...and the fact that I don't have any other kind of scope wink.gif

Same here.  


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