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AT72EDII vs TSAPO72F6

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#1 blemasle

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Posted 10 October 2019 - 06:54 AM

Hi,

Are there any real difference between a AT72EDII and a TSAPO72F6 ?
They are supposed to be same according to many resources online, including here on CN.
 
But then, I found this link : https://www.landseas...try-test-r.html
Based on the visual, I'm pretty convinced that the AT72EDII match the "Deluxe CNC" version whereas the TSAPO72F6 is the "Standard" version.
The difference stated in that last link description aren't meaningfull to be, as both focuser appears to be identical (and both models have the standoff on the pictures).

Those rebranded scopes are tough to differentiate for a newbie like myself. It's hard to know if you're making the right assumptions frown.gif
 
Regards,
Bertrand
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#2 sg6

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Posted 10 October 2019 - 07:21 AM

With a rebrand you can often find you need to identify the source. That can be fun.

Different brands will offer different add-ons and accessories - one or two eyepieces, 2 Kellners/1 plossl, assorted finders.

 

What I am curious about is there any QA at the manufacturer and how, or if, they classify the scopes/lens.

Thinking here that if the scopes/lens are graded A, B, C.

Then what does the one you buy come from in that grading?

 

Testing the optics likely is a 2 second operation these days, so I expect something is performed.

 

Does AT perform any acceptance test when the scopes/lens appear ?

I say AT as I would be reasonably sure that TS do not, whereas AT might - only might however.



#3 Chris Johnson

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Posted 10 October 2019 - 12:24 PM

Both the TS and Altair specify 1 element fpl53 glass. Astro Tech does not specify the glass in their scope.



#4 frebie

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Posted 10 October 2019 - 01:03 PM

The AT-72EDII uses an FPL-53 element, as described in the product title and description on the Astronomics website. The earlier and discontinued AT72ED used FPL-51, but was upgraded to 53 in the current 72EDII, along with other mechanical improvements.


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#5 K.K

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Posted 10 October 2019 - 10:44 PM

AT72EDII's focuser looks the same as the TSAPO72F6. Just the color is different.
Altair's "Deluxe CNC" version seems to be able to rotate the focuser. The "Standard" version is not possible. However, it can be rotated at the end of the draw tube.



#6 blemasle

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Posted 11 October 2019 - 02:28 AM

AT72EDII's focuser looks the same as the TSAPO72F6. Just the color is different.
Altair's "Deluxe CNC" version seems to be able to rotate the focuser. The "Standard" version is not possible. However, it can be rotated at the end of the draw tube.


I got carried away by the black color of the back of the tube, thinking the black part of the AT72 matched the black part of the Altair CNC version.
That was totally wrong!

So all three tubes seems to be identical, and the Altair CNC version is one step higher. The good news is, the CNC version comes with an optical report which means every scope is tested.
Strangely, even the Standard version does not match the Altair price point. So there must be another difference somewhere...

The TS optics feel cheaper than the Astro-Tech / Altair though. In part because of the tiny screws they used. Plus, it seems to be "missing" a part at the back (the red one on other tubes).
I honestly don't know what this is cause I never used a scope before, only DSLR lenses smile.gif

#7 Jaimo!

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Posted 11 October 2019 - 06:03 PM

All things being equal, I'd buy a scope from Astronomics, the generous sponsor of CloudyNights...  Support the community.


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#8 Tyson M

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Posted 11 October 2019 - 06:13 PM

The AT72EDII gets amazing reviews.  Seems to be a great grab and go scope fitting on the smallest phototripods.  



#9 blemasle

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Posted 12 October 2019 - 12:38 PM

All things being equal, I'd buy a scope from Astronomics, the generous sponsor of CloudyNights...  Support the community.


That would be a good reason to buy this one indeed. I was originally looking for a retailer in europe to avoid moving the scope all around the world though smile.gif
I can't find the flattener that is supposed to go with that scope on the astronomics website. Should I really find the dedicated one or can I grab any flattener designed for roughly he same APOS (size/apeture) ?

#10 Jaimo!

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Posted 12 October 2019 - 05:15 PM

That would be a good reason to buy this one indeed. I was originally looking for a retailer in europe to avoid moving the scope all around the world though smile.gif
I can't find the flattener that is supposed to go with that scope on the astronomics website. Should I really find the dedicated one or can I grab any flattener designed for roughly he same APOS (size/apeture) ?

That makes perfect sense.

 

Jaimo!



#11 blemasle

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Posted 12 October 2019 - 05:31 PM

That makes perfect sense.

 

Jaimo!

Could you help me regarding the choice of a flattener. I sometimes see that some manufacturer make dedicated flatteners, which are  supposed to be an "optical match" for the scope they're designed to.

 

Is that just marketing **** or is it the preferred way to go ?



#12 Anhydrite

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Posted 12 October 2019 - 11:37 PM

The TS scope looks like the William Optics Z73.



#13 blemasle

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Posted 13 October 2019 - 06:57 AM

The TS scope looks like the William Optics Z73.


It just looks like it, but I doubt there are the same.
The TS / Astro Tech weight 2.18kg, whereas the Z73 weights 2.50kg, even 2.83 for the Z73 II (all with rings and dovetail).

#14 Anhydrite

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Posted 13 October 2019 - 10:22 AM

It just looks like it, but I doubt there are the same.
The TS / Astro Tech weight 2.18kg, whereas the Z73 weights 2.50kg, even 2.83 for the Z73 II (all with rings and dovetail).

Good point.  Probably not the same.



#15 blemasle

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Posted 31 January 2020 - 07:09 AM

As an closing point for those that would come across this thread, I settled on the Altair Astro 72 EDF "Deluxe".
It is essentialy the same as the the AT72EDII, but comes from the UK with an optical test report. Although the optical report validity can be discussed, it is at least a guarantee of quality control.

So far I'm pretty happy with it and have obtained good results during my first nights.
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#16 Dinomonaco

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Posted 12 June 2020 - 08:35 AM

Hello Explorer 1,
So I just across this post and find myself in exactly the same situation as you were regarding which way to go: AT72II, TSAPO72 or the Altair 72EDF.
I see you finally decided on the Altair 72. I’m leaning towards the same. Although the AT72II is $300 cheaper than Altair. I wonder why. So what are your impressions of the scope. CA must be great considering the glass type used. Any issues worth mentioning? Thanks in advance.

#17 blemasle

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Posted 14 June 2020 - 03:16 PM

Hi,

 

The AT72II was out of the equation for me. I didn't want to order my scope in the US while I'm in France. Just a precaution in case a problem arose. That left me with either the Altair 72EDF or the TSAPO72. I have no real ideas why the AT72II is 300$ cheaper than the Altair. But the AT72EDII seems to be closer to the regular 72EDF than the 72EDF Deluxe. Doing so, the standard edition is roughly in the same price point (469$ vs 499£).

So far, It is a great scope, although I had issue with field curvature at first.

I'm using an APS-C, a rather large sensor from an astrophotography point of view. With such wide sensors, field curvature can be a hassle if you do not have the right field flattener. I originally settled on the Hotech SCA Field flattener but it didn't work as expected in my case. Plus, despite what the manufacturer claims, it has never been designed nor is suited for such short focal lengths at all. I'm not the only one who came to this conclusion and I should have search better before buying it.

I also bought a long Perng 0.8x field flattener in the hope of widening my field of view, but it was even worse than the Hotech and barely half of the image was usable.

At that point, I started to doubt the scope itself and contacted Altair Astro, which were very thoughtful and patient with all my questions I must say. They pointed to me that they sell an adjustable 1.0x field flattener which is commonly used with the 72EDF, but I didn't really like the design of it. Plus, TS optics sells a dedicated 1.0X field flattener for the TSAPO72 that screws directly on the scope, has an integrated field rotator, and is supposed to optically match the TSAPO, which is almost the same if not identical to the 72EDF. I'm happy to report that this one is a gem. I used a variable M48 to find the right spot, but it is very close from the manufacturer specs (around 56mm vs 55mm).

You can find a few results obtained with that scope, and the Hotech SCA. I haven't published an image with the TSFlat72 yet, so field curvature isn't ideal on the link below. Because of this, you can easily inspect around images center (no corners has under corrected field curvature worsen the aberrations) to get a better idea about CA, which is almost inexistant.

 

https://www.astrobin...docyfc/?nc=user

https://www.astrobin...yf93n9/?nc=user

https://www.astrobin...zfcnhw/?nc=user

 

Feel free to ask any other questions you might ask :)

Regards


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#18 gwlee

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Posted 14 June 2020 - 04:08 PM

Hi,

Are there any real difference between a AT72EDII and a TSAPO72F6 ?
They are supposed to be same according to many resources online, including here on CN.
 
But then, I found this link : https://www.landseas...try-test-r.html
Based on the visual, I'm pretty convinced that the AT72EDII match the "Deluxe CNC" version whereas the TSAPO72F6 is the "Standard" version.
The difference stated in that last link description aren't meaningfull to be, as both focuser appears to be identical (and both models have the standoff on the pictures).

Those rebranded scopes are tough to differentiate for a newbie like myself. It's hard to know if you're making the right assumptions frown.gif
 
Regards,
Bertrand

Don’t know, and I have owned an AT72ED2 for years. Rebrands of the same scope from the same offshore manufacturer often have differences specified by the importer. Sometimes they are significant differences, but more often they are cosmetic. You can ask Mike at Astronomics, but expect he will say he doesn’t know. 
 

Many of us here own the AT72ED2 and can vouch for it, so that would be my recommendation  between these two. 


Edited by gwlee, 14 June 2020 - 04:14 PM.



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