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evostar / black diamond 120 mm, tread

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#1 sunnyday

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Posted 20 October 2020 - 12:16 PM

you have one, give us your impressions.

 

 

Apochromatic refractors have somewhat of a cult following; they are considered the finest instrument to observe and photograph the skies. Due to increasing popularity and lower manufacturing costs, these once-expensive telescopes are now much more affordable.

The Razor-sharp, false colour-free "APO" optics are perfect for visual and photographic applications. Advanced anti-reflection coatings optimize light transmission through the glass, approaching 99.5% transmission. The optical tube is fully baffled and blackened to reduce stray, unfocused light to maximize contrast.

Sky-Watcher chose Schott optical glass for the crown element. Schott pioneered the scientific development of optical glass. Their optical glass specialists are dedicated and experienced. The high levels of quality of Schott optical glass is further enhanced by their stringent quality control procedures. In short, you want the best, right?

The second lens element is comprised of FPL-53 Extra-low Dispersion glass, an exotic blend containing Fluorite. When combined with the Crown element, higher resolution and contrast is achieved by virtually eliminating chromatic aberration, an effect caused by colors focusing to different points.

This model, and previous incarnations are popular not only as a first scope, but as a second scope for autoguiding. It provides more field of view than a Schmidt-Cassegrain, making it the perfect companion.

 

Features
FPL-53 ED glass aids in the elimination of chromatic aberration
Crown element made with Schott optical glass
Fully baffled and blackened for maximum contrast
2" Crayford focuser w/ 10:1 fine-focus for smooth, precise focusing
Includes Aluminum carry case .

Specifications
Aperture: 120mm (4.7")
Focal Length: 900mm (35.4")
Focal Ratio: f/7.5

Lens Construction: doublet APO, first element crown glass, second element FPL-53 ED glass
Focuser: 2" 10:1 dual-speed Crayford, with lock screw
Eyepiece: 2" 28mm (32x) w/ adjustable eye guard
Diagonal: 2" Dielectric star diagonal, 1.25" reducer adapter, both with brass compression rings

Finderscope: 9x50 right-angle correct-image
Mount Type: Cast Aluminum rings with 44mm (1.75") dovetail bar, can be mated to a variety of mounts.
 


Edited by sunnyday, 20 October 2020 - 12:22 PM.


#2 sunnyday

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Posted 20 October 2020 - 12:28 PM

this telescope is fascinating.
first, the quality of construction.
the materials used for the lenses.
and its still affordable price.

 

I have no difficulty in paying homage to this telescope, it is in a class of its own. for the visual (that's what I do with) it impressive, the color correction is worthy of the biggest name of telescope, but at a much lower price.



#3 wrvond

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Posted 20 October 2020 - 12:54 PM

I put a Feather Touch focuser on mine.

 

You don't know what you don't know.

At one time, I had a GSO focuser that included a rotating ring. I thought that was pretty great. Then I switched to the Feather Touch focuser. What a difference!

I'm sure there are telescopes that are machined much more precisely with glass that is much better than this Sky-Watcher, but I've never looked through them, so this one is the best I've ever used and I am quite satisfied with it.


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#4 sunnyday

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Posted 20 October 2020 - 01:02 PM

I put a Feather Touch focuser on mine.

 

You don't know what you don't know.

At one time, I had a GSO focuser that included a rotating ring. I thought that was pretty great. Then I switched to the Feather Touch focuser. What a difference!

I'm sure there are telescopes that are machined much more precisely with glass that is much better than this Sky-Watcher, but I've never looked through them, so this one is the best I've ever used and I am quite satisfied with it.

I agree the focuser is not of great quality, but it is still good.

I also have a 100 dz tak and an es 127 triplet.
but in this 120mm doublet step, I find it to be the best.
that said it is only my opinion nothing else.


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#5 jeffmac

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Posted 20 October 2020 - 08:02 PM

this telescope is fascinating.
first, the quality of construction.
the materials used for the lenses.
and its still affordable price.
 
I have no difficulty in paying homage to this telescope, it is in a class of its own. for the visual (that's what I do with) it impressive, the color correction is worthy of the biggest name of telescope, but at a much lower price.


Well, I don't have this scope but I once thought about buying one. I don't necessarily need one. I have two 4" apos. But, I toyed with the idea of an almost 5" apo to gain a little more resolution. Of course, I would probably have to consider purchasing a more adequate mount. I've been fascinated with the almost unanimous satisfaction from owners of this scope. But one thing that perplexes me is the price of a new SW Evostar 120. The asking price for this scope has gone up at least two times. It is now a paltry $300 or so less than the SW Evostar 150 and fast approaching the price of Tak's FC100. If I were in the market and the price went up again, I'd opt for the Vixen 115ED. That being said, the SW Evostar 120 is still much less than most if not all other 120ED scopes. I guess I should have jumped on one when they were $1250 and I remember seeing ads in CN and Astromart for under $1000.

Edited by jeffmac, 20 October 2020 - 08:40 PM.


#6 sunnyday

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Posted 20 October 2020 - 08:10 PM

Well, I don't have this scope but I once thought about buying one. I don't necessarily need one. I have two 4" apos. But, I toyed with the idea of an almost 5" apo to gain a little more resolution. Of course, I would probably have to consider purchasing a more adequate mount. I've been fascinated with the almost unanimous satisfaction from owners of this scope. But one thing that perplexes me is the price of a new SW Evo 120. The asking price for this scope has gone up at least two times. It is now a paltry $300 or so less than the SW Evo 150 and fast approaching the price of Tak's FC100. If I were in the market and the price went up again, I'd opt for the Vixen 115ED. That being said, the SW Evo 120 is still much less than most if not all other 120ED scopes. I guess I should have jumped on one when they were $1250 and I remember seeing ads in CN and Astromart for under $1000.

you're absolutely right, i paid $ 1600 canadian with taxes and everything.
now it is 2650 still in canadian, as you say i find it too close to the price of a tak 100 fc.
but it's still a 120mm.


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#7 jeffmac

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Posted 20 October 2020 - 08:44 PM

you're absolutely right, i paid $ 1600 canadian with taxes and everything.
now it is 2650 still in canadian, as you say i find it too close to the price of a tak 100 fc.
but it's still a 120mm.


Just checked Highpoint Scientific. $1950. If I bought one now, it would be used.
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#8 helpwanted

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Posted 28 October 2020 - 12:00 AM

FPL-53 Extra-low Dispersion glass, an exotic blend containing Fluorite

 

i don’t think FPL-53 contains any Fluorite, it’s one step down below Fluorite, which is a crystal made in a lab, FPL-53 is a glass. 
 

 

http://www.ianmoriso...jective-lenses/  


Edited by helpwanted, 28 October 2020 - 12:04 AM.


#9 Petripher

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Posted 28 October 2020 - 06:40 AM

FPL-53 has chunks of fluorite mixed in with the glass when melted to a greater or lesser extent re:grades of FPL-53

Very funny, you have a nice humor lol.gif 



#10 sunnyday

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Posted 28 October 2020 - 07:42 AM

nowhere in my book it says that fpl- 53 has fluorite or is fluorite .



#11 sunnyday

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Posted 28 October 2020 - 07:53 PM

what does this mean, my english is not my first language.

 

FPL-53 ‘Super ED’ or ‘FD’ glass made by Ohara in Japan with an Abbe Number of 94.94 − less expensive and easier to work with than fluorite crystal with a very similar Abbe Number to fluorite. Chemically more stable than fluorite.  Also referred to as ‘Synthetic Fluorite’ or ‘SF’ glass.  It is easier to design a colour free lens using FPL-53 than glass with lower Abbe numbers, but it is somewhat harder to figure and does not maintain its shape as well with changes in temperature.  Triplet lenses using fluorite or FPL-53 can give essentially perfect correction for chromatic aberration both in focus and outside of focus.



#12 sunnyday

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Posted 28 October 2020 - 08:11 PM

the way I understand it.
that is, there is no fluorite mixed with the glass.
it comes from skywatcher.



#13 Astrola72

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Posted 28 October 2020 - 08:20 PM

My first AP scope was an SW 120ED Pro (same scope I think). Got it and a CGEM for $1800! Shot this with an Atik 314 on the 120ED:

 

get.jpg?insecure

 

Joe


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#14 sunnyday

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Posted 28 October 2020 - 08:47 PM

My first AP scope was an SW 120ED Pro (same scope I think). Got it and a CGEM for $1800! Shot this with an Atik 314 on the 120ED:

 

get.jpg?insecure

 

Joe

very nice and sharp, thanks .



#15 sunnyday

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Posted 28 October 2020 - 08:48 PM

http://www.ianmoriso...jective-lenses/



#16 The Luckster

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Posted 28 October 2020 - 09:35 PM

Here is my SW120ED with GSO 2-speed focuser.  After several sessions, I determined the GSO unit was no better than the stock focuser.  I have since returned the GSO unit to the ST120, and returned the stock unit to the SW120.  I'm visual only, and my loads wont's exceed 4 lbs.  BTW, the stock focuser works just fine and I have no intentions of replacing it with another Crayford...only a R&P.

 

IMG_0707_LR-2_LR.jpg

 

 

CS

 

jason


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#17 sunnyday

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Posted 28 October 2020 - 09:45 PM

Here is my SW120ED with GSO 2-speed focuser.  After several sessions, I determined the GSO unit was no better than the stock focuser.  I have since returned the GSO unit to the ST120, and returned the stock unit to the SW120.  I'm visual only, and my loads wont's exceed 4 lbs.  BTW, the stock focuser works just fine and I have no intentions of replacing it with another Crayford...only a R&P.

 

attachicon.gifIMG_0707_LR-2_LR.jpg

 

 

CS

 

jason

nice setup , thanks


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#18 Echolight

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Posted 28 October 2020 - 10:27 PM

I just got the 80 a couple of weeks ago for 40% off. It was sold as used because the original box was damaged during shipping and refused by the original purchaser. I wouldn't have paid $825 for it. Everything inside the case was unmolested, undamaged, in it's factory packaging, and as it should have been.

31E23216-04EB-40D9-A43B-89893D25E425.jpeg
 

Great little wide field visual scope. And I've run up the power to 187x on planets and 240x on the moon with pretty nice views. Hope to use it for some casual imaging in the future.

 

I like that it came in a case even if it is a cheap case...to protect it during shipping.
Focuser is ok. I like the 2-speed. A rack and pinion would've been nice.

The visual back should have been better. The diagonal could've been better.
I wanted the RACI finder for one of my other scopes. So that was a plus.

I've used the 5mm eyepiece a couple of times and it's not bad.

 

All in all the accessory package is nothing special. But at least you don't have to buy anything extra to use it if you don't want to.

 

Sure would't mind a 120 equivalent. That'll probably be the grand finale to my accumulating astro equipment. Some time right after a 12 inch dob.


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#19 sunnyday

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Posted 28 October 2020 - 10:32 PM

I just got the 80 a couple of weeks ago for 40% off. It was sold as used because the original box was damaged during shipping and refused by the original purchaser. I wouldn't have paid $825 for it. Everything inside the case was unmolested, undamaged, in it's factory packaging, and as it should have been.

attachicon.gif31E23216-04EB-40D9-A43B-89893D25E425.jpeg
 

Great little wide field visual scope. And I've run up the power to 187x on planets and 240x on the moon with pretty nice views. Hope to use it for some casual imaging in the future.

 

I like that it came in a case even if it is a cheap case...to protect it during shipping.
Focuser is ok. I like the 2-speed. A rack and pinion would've been nice.

The visual back should have been better. The diagonal could've been better.
I wanted the RACI finder for one of my other scopes. So that was a plus.

I've used the 5mm eyepiece a couple of times and it's not bad.

 

All in all the accessory package is nothing special. But at least you don't have to buy anything extra to use it if you don't want to.

 

Sure would't mind a 120 equivalent. That'll probably be the grand finale to my accumulating astro equipment. Some time right after a 12 inch dob.

put a photo with its mount.
nice scope btw.
thanks.



#20 Echolight

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Posted 28 October 2020 - 11:03 PM

put a photo with its mount.
nice scope btw.
thanks.

But it's not a 120..

 

Here it is with a WO DuraBright and 20 Hyperwide giving 30x and about 3.33 degrees TFoV.

782C2848-0E5E-415E-8EB2-860A1522D255.jpeg

 

Here's an unfocused hand held phone pic😜

When I was a kid I thought this was the Little Dipper!

E835285B-2CA3-4CF2-9F57-553B226B7B69.jpeg


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#21 sunnyday

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Posted 28 October 2020 - 11:05 PM

but it's an evostar,laugh.gif



#22 Gary Riley

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Posted 28 October 2020 - 11:13 PM

Here is my SW 120 ED Pro.  Purchased it here on CN for $900 a few years ago.  Had to add a diagonal and a 8x50 RACI finder and a Telrad.  I may change out the focuser later on to something like a Moonlight.  The CG-4 mount I have it on works fine for me for visual use.  I really enjoy using this scope too!  

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  • E40B374B-63FB-48E7-BEAC-E11B293F8114.jpeg

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#23 sunnyday

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Posted 29 October 2020 - 07:25 AM

Here is my SW 120 ED Pro.  Purchased it here on CN for $900 a few years ago.  Had to add a diagonal and a 8x50 RACI finder and a Telrad.  I may change out the focuser later on to something like a Moonlight.  The CG-4 mount I have it on works fine for me for visual use.  I really enjoy using this scope too!  

nice setup,
I have a cg-4 at home, good idea, thanks.



#24 sunnyday

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Posted 29 October 2020 - 12:04 PM

Here is my SW 120 ED Pro.  Purchased it here on CN for $900 a few years ago.  Had to add a diagonal and a 8x50 RACI finder and a Telrad.  I may change out the focuser later on to something like a Moonlight.  The CG-4 mount I have it on works fine for me for visual use.  I really enjoy using this scope too!  

I presume that if you put the 120 on the cg-4, it's all fine.
not too many vibrations I suppose?



#25 Gary Riley

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Posted 29 October 2020 - 07:07 PM

I observe from my back deck. I use vibration suppression pads under the legs to help with vibrations. I also try to use a light touch when focusing. It works for me for the most part.
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