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Doubles trouble..scope choice


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Wow! Lots to consider. Thanks all. 

My main interest in doubles lies not in the toughest split,one can always find tougher and tougher pairs requiring  bigger and bigger scopes...hey why stop there  take up spectrographs..you get the idea. I like studying stellar evolution and doubles provide this and aesthetic differences as well. So colours are important. That favors the ED or All scopes . But if say the 72mm is doable budget wise the small focal length only gives 45x's for a 10mm eyepiece. Does a Barlow which introduces more glass surfaces take away some of the visual quality?

More to think about

Cheers

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17 minutes ago, Jimboscotland said:

Wow! Lots to consider. Thanks all. 

My main interest in doubles lies not in the toughest split,one can always find tougher and tougher pairs requiring  bigger and bigger scopes...hey why stop there  take up spectrographs..you get the idea. I like studying stellar evolution and doubles provide this and aesthetic differences as well. So colours are important. That favors the ED or All scopes . But if say the 72mm is doable budget wise the small focal length only gives 45x's for a 10mm eyepiece. Does a Barlow which introduces more glass surfaces take away some of the visual quality?

More to think about

Cheers

Barlows used to have a very bad reputation, but decent ones these days take away little or nothing, other than adding focal length.

A 72mm should cope with much higher mags than x45 too, I’ve had them up to x120 or more and they perform very well. The main consideration then is the small exit pupils and how well your eyes cope with it, floaters can become an issue but not necessarily a problem for doubles. Which eyepieces do you currently have?

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Just starting over, so I'd need the whole kit. But that's better in the long run than getting a scope pkg. and replacing things, I'd have what I like from the get go.

1 1/4 dialectic mirror diagonal and 1 1/4 eye pieces. Not sure of the finder as a long focal length eye piece could make it it's own finder.?? Recommended barlow??

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Hi @Jimboscotland, I would just like to add my experience with observing doubles.

At present I have 3 scopes. OMC250, Orion Optics 200mm F6 Newt. and an ST80.

The OMC250 gives the best resolution but lives in an observatory I wouldn't want to have to drag it around, it is pretty heavy.

The Newt was originally on an EQ5 and was portable around the garden but was a little unwieldy. It is now on a dob base so is very easy to move around the garden and set up to avoid obstructions. This scope gives fantastic views and combined with a quality eyepiece like an orthoscopic will provide a true colour view.

The ST80 is on a photo tripod. It is very portable, a true grab and go. The colour correction is ok. It does limit the fainter stars in light polluted skies.

Each of these scopes has it's place but if I had to choose one it would be the Newt. I have had it since 2005 and will never sell it. It is a great all-rounder.

Cheers

Ian

 

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8 hours ago, Jimboscotland said:

I like studying stellar evolution

You’d probably enjoy carbons stars too then? Quite a few of those around, which increases the number of interesting objects available to a smaller scope. If stars are your thing, it’s hard to beat a refractor for aesthetic pleasure. So for doubles and carbon stars, would I choose my 100mm F10 achro or my previously owned 72mm ED refractor? The achro has better resolving power but introduces a yellow cast and is pretty unwieldy at 1000mm FL and therefore not always fun to use. However the purple halo typical of achros is only visible on really bright stars. The yellow cast can be annoying in some situations, but actually it can highlight the colours of orange and red stars, even if not totally accurate. The 72mm gave lovely pinpoint views, superb contrast and was just so easy to use. If you can get a used 80mm ED perhaps that’s the best of both worlds?

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10 minutes ago, Jimboscotland said:

Thanks Rob for the suggestion of the Starwave 80mm ED. Worth considering.

The primary targets in my light polluted urban garden are doubles using the 102ED version. I've owned the scope about twenty months and it consider it a bargain (£495 at the time)... During this period I've also owned a 102mm Mak and have a 127 Mak. On doubles, the little maksutovs are out performed in every way by the refractor.

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  • 4 weeks later...
On 15/08/2022 at 11:42, dweller25 said:

I am so glad you posted this review up about the scopetech. Note the review is for a Tak version which is identical to the scopetech. 

I had been wondering about the performance of this. The fact it is made in Japan and the same standard as a Tak says an awful lot. 

Seems near ED performance from an F10 achro is possible when done right. I can only assume they are using top quality glass to get such good results. 

Comes with 2 quality ortho's as well, what's not to like. 

If I didn't already have an 80mm frac, I would be very, very tempted to buy one of these. 

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