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AT102ED - on sale, has anyone used one?

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1013 replies to this topic

#1 joelin

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Posted 31 May 2018 - 12:50 PM

I'm in the market for a refractor to go on my Orion Sirius. Sometimes visual, but primarily imaging.

 

I came across this: https://www.astronom...ota_p20548.aspx on sale for $100 off. Seems like a pretty good price!

 

Can anyone speak to the quality of it and how it works with a field flattener and a full frame sensor?


Edited by joelin, 31 May 2018 - 12:50 PM.


#2 Cometeer

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Posted 31 May 2018 - 12:55 PM

Oh man, why'd you have to post this? bawling.gif  Now I'm tempted to get one! grin.gif


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#3 gnowellsct

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Posted 31 May 2018 - 01:35 PM

I think you should just buy it.  If it turns out to be horrible you can sell it for $250 and then you will have gained valuable experience you can tell us about for the mere sum of $250.  If it turns out to be great then you have a great telescope for $250.  

 

Plus I was reading in Bloomberg that China's trade surpluses are getting smaller and that is threatening a decrease in investment in world bond markets (translation: interest rates will go up) so the patriotic thing to do is buy imports and drive up the trade deficit.

 

Greg N


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#4 gnowellsct

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Posted 31 May 2018 - 01:36 PM

In the back of your mind, though, set aside $500 for an a feather touch focuser.  You may need it.  


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#5 eros312

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Posted 31 May 2018 - 01:50 PM

In the back of your mind, though, set aside $500 for an a feather touch focuser.  You may need it.  

Nah, the focuser on mine is better than anything I've ever used before, though I've never used a FT.


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#6 nicoyenny

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Posted 31 May 2018 - 01:53 PM

Thanks, now I ALSO want one ... How can I justify getting another 4" refractor?


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#7 joelin

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Posted 31 May 2018 - 02:19 PM

What flatteners or reducers work well with this?
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#8 CHASLX200

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Posted 31 May 2018 - 05:48 PM

I have one and it was the best bang for the buck chuck. Now if it is 100 off it is even a better bang for the buck.  The focuser is fine on mine. Mine takes a 3mm Delite and can go even higher if i had more power to give it.

 

Can't get a better deal neal.


Edited by CHASLX200, 31 May 2018 - 05:49 PM.

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#9 Cpk133

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Posted 31 May 2018 - 06:06 PM

I think you should just buy it.  If it turns out to be horrible you can sell it for $250 and then you will have gained valuable experience you can tell us about for the mere sum of $250.  If it turns out to be great then you have a great telescope for $250.  

 

Plus I was reading in Bloomberg that China's trade surpluses are getting smaller and that is threatening a decrease in investment in world bond markets (translation: interest rates will go up) so the patriotic thing to do is buy imports and drive up the trade deficit.

 

Greg N

You work in sales, or is that new common core math?  lol.gif


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#10 Steve Allison

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Posted 31 May 2018 - 06:29 PM

If I weren't a long-focus achromat nut, this telescope would now be on its way to me.

 

Think about it. A brand new, FOUR (4) inch, F7, multicoated ed refractor with a 2 speed focuser and mounting rings for $500 lousy bucks? 

 

On the other hand, if it didn't throw up a perfect diffraction disk, I would not keep it. No matter how color-free it might otherwise be.

 

Fussy Steve


Edited by Steve Allison, 31 May 2018 - 06:51 PM.

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#11 GOLGO13

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Posted 31 May 2018 - 07:19 PM

I had a scope like this (102 ED with FK61). It was by Astrotelescopes, but has been sold under many companies names.

 

It was a nice scope, but it was somewhere in-between and achromat and a FPL53 doublet. Pretty good color correction, but still plenty of color.

 

For 499 that's not a bad deal! That being said, I would suggest the Skywatcher 100mm ED for just a little more. I think it's a much better deal for what you get: https://www.astronom...ope_p18772.aspx


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#12 Jon Isaacs

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Posted 31 May 2018 - 07:26 PM

I had the first version of the AT-102ED.. I actually had the very first one.  $500 for this new one, better focuser, presumably the same basic optics, no sliding dew shield.  That's unbelievable.  An AR-102 is $400, it comes with a dielectric diagonal but it's just an achromat.  

 

This is what I thought of the AT-102ED... 

 

https://www.cloudyni...h-at102ed-r1690

 

Jon


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#13 CHASLX200

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Posted 31 May 2018 - 08:03 PM

Got my AT102 ED out warming up now.  Very hot and heavy tonite.  Just a pure steam bath. Maybe seeing will be very good.



#14 starman876

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Posted 31 May 2018 - 10:17 PM

FPL53 doublet is about as close as your going to get to having Fluorite.   Sort of the poor mans Tak.  


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#15 CHASLX200

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Posted 01 June 2018 - 05:08 AM

Seeing was dead still about, but jupiter thru the clouds was very dim. So a no go for last nite.



#16 Jon Isaacs

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Posted 01 June 2018 - 05:40 AM

FPL53 doublet is about as close as your going to get to having Fluorite.   

 

The AT-102ED is not an FPL-53 doublet, it's an FK-61 doublet, FK-61 is comparable to FPL-51 on the Abbe-Normal chart.  

 

jon


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#17 glend

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Posted 01 June 2018 - 01:12 PM

The AT-102ED is not an FPL-53 doublet, it's an FK-61 doublet, FK-61 is comparable to FPL-51 on the Abbe-Normal chart.  

 

jon

Yes it states that FK-61 pretty clearly in the product webpage, which is one contributor to the low price. 



#18 Exnihilo

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Posted 01 June 2018 - 01:45 PM

Looks nice, I could be tempted at some point!


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#19 CHASLX200

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Posted 01 June 2018 - 06:35 PM

It sure gives me pinpoint stars.  Maybe i can try jupiter tonite.  I have not sold the AT102ED yet so that must tell ya guys something.


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#20 Moondust

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Posted 01 June 2018 - 07:22 PM

It sure gives me pinpoint stars.  Maybe i can try jupiter tonite.  I have not sold the AT102ED yet so that must tell ya guys something.

Yes it does. Your next scope to try out is still on the delivery truck. BeatingADeadHorse.gif  Seriously though, report back to us about Jupiter. I am considering one of these scopes and the sale price is making it harder to ignore.   


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#21 CHASLX200

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Posted 01 June 2018 - 07:27 PM

Looks like better weather tonite. Wished i had a 2mm eyepiece.  3mm is still not pushing it.



#22 CHASLX200

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Posted 01 June 2018 - 08:15 PM

Jupiter is popping tonnite. Bright red on the big spot and a nice dark oval above the red spot. Moons are perfect little disk with a 3mm Delite. Also have the SW 150mm Mak out side by side. Hard to pick a winner as both scopes are a total diff horse since the Mak F/12 and the AT102 F/7. 


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#23 Moondust

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Posted 01 June 2018 - 08:36 PM

Jupiter is popping tonnite. Bright red on the big spot and a nice dark oval above the red spot. Moons are perfect little disk with a 3mm Delite. Also have the SW 150mm Mak out side by side. Hard to pick a winner as both scopes are a total diff horse since the Mak F/12 and the AT102 F/7. 

Sounds promising. How much CA are we talking on Jupiter? I assume you're staying up for Luna, Saturn and Mars and giving a full report back to us in the wee hours.goodjob.gif  



#24 CHASLX200

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Posted 01 June 2018 - 08:41 PM

Not enough color to bother me and i am picky about color.  Just a tiny bit of purple. A 7mm Nagler seems to give the best pop on Jupiter and a 5mm Radian also does very well.  You start getting a dim image at 5mm and 3mm on Jupiter.  Scope is very light and a GP mount holds it fine.


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#25 Moondust

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Posted 01 June 2018 - 09:23 PM

Not enough color to bother me and i am picky about color.  Just a tiny bit of purple. A 7mm Nagler seems to give the best pop on Jupiter and a 5mm Radian also does very well.  You start getting a dim image at 5mm and 3mm on Jupiter.  Scope is very light and a GP mount holds it fine.

Since you mentioned the GRS was showing I grabbed my little AT 72 ED II and pointed it at big Jupe. The salmon color of the GRS was dazzling with a 3.2 mm eyepiece at 135x, I don't remember seeing such vivid color in the spot with any of my other scopes (most much larger and way more expensive) over the years, it always seemed to be just a shade of grey to me. This little 72 continues to amaze me. I have moved to a different location and seeing here seems to be excellent most of the time so that may be part of the reason the view is so good.  I can only imagine how much better it would be in the 102.     




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