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SW Pro ED120 vs ES ED127 Essential Series

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#1 wrvond

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Posted 10 September 2019 - 06:00 PM

Hi folks,

I'm at an impasse. I'm trying to decide between the Sky Watcher Pro ED120 900mm f/7.5 doublet and the Explore Scientific ED127 Essential Series 952mm f/7.5 triplet

 

I'd love to hear which you pick and why.

 

Thanks in advance.

 



#2 nicoledoula

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Posted 10 September 2019 - 06:08 PM

If I were an imager I'd take the triplet, but I'm not so The 120 ED would be my ticket. You might get a smidge more detail with 7mm's but I'll take the shorter cool down times. 


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#3 coopman

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Posted 10 September 2019 - 06:34 PM

What do you plan to use it for?



#4 junomike

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Posted 10 September 2019 - 06:44 PM

IME the 120ED is as well color corrected or better than the ES.

Easy choice for me as I'm visual and would rather have a faster acclimating OTA.


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#5 Jond105

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Posted 10 September 2019 - 06:49 PM

Sky-Watcher 120ED all day. Biased opinion, but, a doublet with the glass elements that is extremely well corrected. The focuser is a little rough with heavier eyepieces out of the box. That’s a downside. Will have to learn to tweak or replace it. I was just never drawn to the oversized dew shield of the ES. The Sky-Watcher was just always and still is well regarded by many of its owners, and now I’m one of them. 

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#6 Gary Riley

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Posted 10 September 2019 - 06:53 PM

Really like my SW 120 ED Pro.  Fairly light-weight, quick cool down time and I am unable to detect any CA in mine at all.  The focuser is the only weak-link about it, IMO, but still very useable.  

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#7 wrvond

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Posted 10 September 2019 - 06:57 PM

What do you plan to use it for?

Visual.



#8 areyoukiddingme

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Posted 10 September 2019 - 07:08 PM

I would check the thread on the test reports on the ES scopes. For what the tests are worth, they seem to generally be diffraction limited or a little better.

 

People rave about the quality of the optics in the Skywatchers, so I would guess that you are somewhat more likely to get something of excellent optical quality from Skywatcher than from ES. How much better, hard to tell as it's rare to hear someone gripe about the optics on their 120eds.


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#9 Sleep Deprived

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Posted 10 September 2019 - 07:47 PM

I own an ES ED127, and have nothing bad to say about it.  So any recommendation I can make would be as biased as any of the SW120 owners here.  Performance-wise, you won't go wrong either way.  Nor would you regret one over the other.  With that in mind, you might want to look at other factors:  price, weight, standard accessories, available accessories, or even (heck, why not?) color.

 

FWIW, I like my 127.  I have not looked through a SW120.  Is this a 1st scope, an upgrade, or a down-size?  What kind of mount to you want/have?  If performance is very similar, you'll have to decide on other factors, and decide which of those factors are important to you.

 

Either way you go, good luck and enjoy your new scope!


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#10 jeremiah2229

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Posted 10 September 2019 - 07:54 PM

The Evostar 120 with 2" diagonal, RACI and two rails on the rings ready to go is a smidgen over 14 pounds. The 130mm triplet set up the same is 26 pounds. Guess which one gets left indoors? My sample of the 120 gets no complaints from me at all, I'm thankful.  waytogo.gif

 

 

Peace...


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#11 wrvond

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Posted 10 September 2019 - 08:01 PM

Things that attract me to the ES are:

1. Sliding dew shield 

2. Crayford style focuser

3. True 5” clear aperture 

4. Traditional color scheme

 

Things that attract me to the SW are:

1. Faster cooling due to less and slightly smaller glass

2. I already have a GSO 2" Linear Bearing Crayford Focuser that should fit right in



#12 wrvond

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Posted 10 September 2019 - 08:06 PM

  Is this a 1st scope, an upgrade, or a down-size?  What kind of mount to you want/have?  

This is an upgrade - replacing a Meade LX70 R5 app on a CG5 GOTO mount.



#13 Jond105

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Posted 10 September 2019 - 08:25 PM

This is an upgrade - replacing a Meade LX70 R5 app on a CG5 GOTO mount.

Having 2 120 f/8.3 achros myself, I feel/wish the 120ED was the first and only scope I had upgraded it from. Would have saved me a lot of money. 


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#14 Sleep Deprived

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Posted 10 September 2019 - 08:47 PM

 

This is an upgrade - replacing a Meade LX70 R5 app on a CG5 GOTO mount.

Well, duh!  I should have looked at your 'signature', or whatever it's called, to see all your equipment.  Definitely NOT a first scope.  If it were me (and it isn't, I realize), I'd lean towards the lighter scope, but I'd look for a used one (of either) and grab the first one that seems like a good deal.  But that's what I do.  I got a screaming deal on my ED127.  I, too, wanted a true 5" aperture, so that caused me to lean to the 127.  Yes, there's the danger of getting one with undisclosed problems/abuse, but for the most part sellers on these forums are honest.  If I save $100 on a $1500 scope, I think I am getting away with something.  If I save $500, I get a rush and feel more alive than ever!!  Sad, but true.  If you have the $$$ and don't want the risk, go with a new one and feel great that you got what you wanted, knowing that YOU are the one that gets to wear off the 'new car smell' of it.

 

Something to consider, and if I had ANY complaint about the ED127 it would be this, is that a sliding/removeable dew shield probably weighs more than one left in place.  The ES one probably weighs close to 2# or more (haven't weighed it) and has an extra heavy ring at its base - it has a thicker body (I think it is 2 metal layers thick all the way around) than a single-layer dew shield.  BECAUSE it is removeable, and heavy, I am looking into putting the dew shield in the closet for safe keeping, and having my everyday dew shield be a flat-black painted piece of acetate (or similar film/sheet material) and wrap it around the end of the scope --- should block stray light and dew as well as the big metal thing.  The dew shield is quite hefty.


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#15 areyoukiddingme

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Posted 10 September 2019 - 09:10 PM

The Evostar 120 with 2" diagonal, RACI and two rails on the rings ready to go is a smidgen over 14 pounds. The 130mm triplet set up the same is 26 pounds. Guess which one gets left indoors? My sample of the 120 gets no complaints from me at all, I'm thankful.  waytogo.gif

 

 

Peace...

 

Are you certain about the weight? My recollection is that the 6" F8 came in around 22/23lb with rings installed. 



#16 wrvond

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Posted 10 September 2019 - 09:22 PM

Thank you all for your insightful replies. They have really helped me figure out what is important to me and what is not so important.  bow.gif

 

I’ve got a message in on a used SW so we’ll see how it goes. waytogo.gif


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#17 jeremiah2229

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Posted 10 September 2019 - 09:48 PM

Are you certain about the weight? My recollection is that the 6" F8 came in around 22/23lb with rings installed. 

Which one?

 

The 120 Evostar is just over 14 pounds as posted and the 130mm triplet is a SV130EDT and is 26 pounds as posted.

 

 

Peace...



#18 Sleep Deprived

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Posted 10 September 2019 - 10:07 PM

I forgot until just now, but I was asked the weight of my ES ED127 back in April, and posted this:

 

 

I bought a used ES127 about a month ago.  I don't know how old it is. Mine has a metal tube, not the carbon-fiber tube.  I just weighed mine with the carrying handle, a Vixen-style dovetail, no diagonal, no spotting/tracking scope, and with the dew shield.  This weighed in at 18.2 lbs on my bathroom digital scale.

 

Clear skies to all!


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#19 areyoukiddingme

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Posted 10 September 2019 - 10:35 PM

Which one?

 

The 120 Evostar is just over 14 pounds as posted and the 130mm triplet is a SV130EDT and is 26 pounds as posted.

 

 

Peace...

 

I had assumed you were referring to the OP and the comparison was the ES 127mm. I had the ES 152, which was definitely lighter than 26lb.


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#20 nva

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Posted 11 September 2019 - 06:19 AM

The 127mm FCD100 aluminium version can be had for about ~1600 as the SW120ED (amazon) right now if you can find a 10% off coupon while their summer sale is still going on.


Edited by nva, 11 September 2019 - 07:08 AM.

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#21 wrvond

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Posted 11 September 2019 - 09:30 AM

It's a done deal!

 

https://www.cloudyni...-pro-ed120-ota/

 

 

Once again, thanks to all for your help!


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#22 Jond105

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Posted 11 September 2019 - 02:16 PM

It's a done deal!

 

https://www.cloudyni...-pro-ed120-ota/

 

 

Once again, thanks to all for your help!

Congratulations. You’ll love it I bet. 


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#23 Sleep Deprived

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Posted 11 September 2019 - 02:25 PM

Congrats on your decision!  You were looking at 2 very nice scopes, so either way would have been good.  I like it that you asked about them both before you made your decision, so you could make a more informed decision.  Enjoy!!!


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#24 Jon_Doh

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Posted 14 September 2019 - 03:44 PM

You made the right decision/purchase imo.  I considered both telescopes and really was leaning toward the 127 until I had a chance to look through both.  The 120 had better color correction.  Looking at bright stars like Vegas made the decision for me.  


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#25 wrvond

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Posted 14 September 2019 - 04:52 PM

You made the right decision/purchase imo.  I considered both telescopes and really was leaning toward the 127 until I had a chance to look through both.  The 120 had better color correction.  Looking at bright stars like Vegas made the decision for me.  

I've been to Vegas, it's definitely bright! I think I even saw a few stars while I was there - assuming Tom Jones still counts! ;)  :D

 

(You know I just couldn't let that one get by! :D)


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