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AT 125 EDL doublet

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57 replies to this topic

#1 sipster

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Posted 26 July 2020 - 08:32 PM

I believe  I will be anxiously awaiting  the arrival  of this scope. Looking for a big brother  doublet to my tv85. This At 125 EDL sounds promising. Anyone  else looked into this scope?



#2 SeattleScott

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Posted 26 July 2020 - 08:34 PM

It is basically the SV Access 125. Plenty of reviews out there. Should be a nice scope and compliment your TV85.

Scott
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#3 starryhtx

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Posted 28 July 2020 - 01:26 PM

I'm interested in it, waiting for some reviews to come up here. 


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#4 SeattleScott

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Posted 28 July 2020 - 03:56 PM

There was a thread about it. I don’t think anyone has received one yet. Definitely one to watch. But I wouldn’t expect it to be really any different than the SV Access and other rebrands. Which were quite good. The way I see it, it is a known product coming out under a different label. If it is something you want you can probably just go ahead and order it. It is basically the same price even so no reason to believe the AT reincarnation is going to be any better or worse.

Scott

Edited by SeattleScott, 28 July 2020 - 03:56 PM.


#5 areyoukiddingme

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Posted 28 July 2020 - 05:18 PM

My now vague recollection is that Stellarview had two versions, and a higher guarantee in Strehl for their premium version.

 

I think there'a  U.K. supplier that also has a high Strehl  guarantee. And yep, plus a bigger focuser:

 

https://www.altairas...cuser-454-p.asp

 

I don't see any such guarantees from the Telescope Service version, however.

 

But I'm going to go out on a limb and say that they all come from the same factory, and the factory will be doing the 95% Strehl guarantee.

 

Seems that there's just variations on set up based on who is making the order.

 

I'm inclined to give the German version a try, but the exchange rates is on a bit of a tear right now.


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#6 Heywood

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Posted 28 July 2020 - 05:21 PM

My now vague recollection is that Stellarview had two versions, and a higher guarantee in Strehl for their premium version.

 

I think there'a  U.K. supplier that also has a high Strehl  guarantee. And yep, plus a bigger focuser:

 

https://www.altairas...cuser-454-p.asp

 

I don't see any such guarantees from the Telescope Service version, however.

 

But I'm going to go out on a limb and say that they all come from the same factory, and the factory will be doing the 95% Strehl guarantee.

 

Seems that there's just variations on set up based on who is making the order.

 

I'm inclined to give the German version a try, but the exchange rates is on a bit of a tear right now.

 

Very interesting!  Thank you!!


Edited by Heywood, 28 July 2020 - 05:23 PM.


#7 areyoukiddingme

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Posted 28 July 2020 - 05:25 PM

I also recall that of the group, Stellarview were doing their own figuring (touch ups?) on the lenses for their premium version.


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#8 SeattleScott

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Posted 28 July 2020 - 05:54 PM

I also recall that of the group, Stellarview were doing their own figuring (touch ups?) on the lenses for their premium version.

Correct, so that option was unique to them and not available through the other rebrands.

Various rebrands offered the 95% Strehl guarantee at various points in time with mixed results. I got the impression this was more for marketing purposes than an true guarantee of getting an outstanding lens. Other than the SV upgrade option, but then you paid extra for that. So personally I wouldn’t expect to get something on par with a 120-130 Tak at this price level, but at least they are being tested and there is some sort of QA happening, and I haven’t heard of any lemons. Generally I get the impression they range from fine to excellent, like most budget Apos.

Scott
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#9 sipster

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Posted 29 July 2020 - 12:05 AM

I'm interested in it, waiting for some reviews to come up here. 

Looks like this version is coming in January. Sv version  discontinued. Stay tuned.



#10 SeattleScott

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Posted 29 July 2020 - 12:13 AM

Looks like this version is coming in January. Sv version discontinued. Stay tuned.

Wow still six months away and already promoting it? Ok yeah stay tuned.

#11 25585

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Posted 29 July 2020 - 06:13 AM

My now vague recollection is that Stellarview had two versions, and a higher guarantee in Strehl for their premium version.

 

I think there'a  U.K. supplier that also has a high Strehl  guarantee. And yep, plus a bigger focuser:

 

https://www.altairas...cuser-454-p.asp

 

I don't see any such guarantees from the Telescope Service version, however.

 

But I'm going to go out on a limb and say that they all come from the same factory, and the factory will be doing the 95% Strehl guarantee.

 

Seems that there's just variations on set up based on who is making the order.

 

I'm inclined to give the German version a try, but the exchange rates is on a bit of a tear right now.

The Altair with FPL53 lens, 3.7" focuser & "binoviewer ready" looks, perfect on paper waytogo.gif  


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#12 CHASLX200

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Posted 29 July 2020 - 06:16 AM

A f/12 would be nice.


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#13 Jon_Doh

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Posted 29 July 2020 - 11:41 AM

A f/12 would be nice.

No.


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#14 CHASLX200

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Posted 29 July 2020 - 06:21 PM

No what?



#15 SeattleScott

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Posted 29 July 2020 - 09:44 PM

A 5” F7 or so is a reasonably portable scope, and it will already have good CA control. A 5” F12 almost needs a backyard observatory.

Scott
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#16 Jon Isaacs

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Posted 30 July 2020 - 07:26 AM

I also recall that of the group, Stellarview were doing their own figuring (touch ups?) on the lenses for their premium version.

 

I have to wonder about that.  Any touch up would require recoating the lens(es) which is not a minor task.  Particularly for a lens that is already coated.  

 

Jon


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#17 dothead

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Posted 30 July 2020 - 07:43 AM

A f/12 would be nice.

Here you go:

 

http://www.frtelesco.../frt120ded.html


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#18 SeattleScott

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Posted 30 July 2020 - 09:32 AM

I have to wonder about that. Any touch up would require recoating the lens(es) which is not a minor task. Particularly for a lens that is already coated.

Jon

Well they were charging $600 for the upgrade.

#19 Toddeo

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Posted 30 July 2020 - 09:47 AM

Looks almost like a Moon Lite focuser.



#20 peleuba

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Posted 30 July 2020 - 10:08 AM

No what?

 

No, Thank you.  


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#21 peleuba

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Posted 30 July 2020 - 10:21 AM

I have to wonder about that.  Any touch up would require recoating the lens(es) which is not a minor task.  Particularly for a lens that is already coated.  

 

Jon

 

Yep -  me too.  Jon, you know that I think there is no way that SV was retouching a coated lens -  absolutely no way.

 

There are a couple of things that SV may have done to increase the quality:

 

(1)  Tweak the current lens by rotating and spacing then testing for best configuration.  This can gain one to a few Strehl value points.

 

(2)  Order the lens from the OEM at a higher spec'd minimum quality and sell it for a premium.

 

As you alluded to, it makes no sense from a production standpoint nor a financial standpoint for SV to polish off the coating; refigure the lens; recoat the glass.  I mean, if you are going to do that then just order the raw materials (glass) and make a lens.  


Edited by peleuba, 30 July 2020 - 11:42 AM.

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#22 Jon Isaacs

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Posted 30 July 2020 - 11:23 AM

Well they were charging $600 for the upgrade.

 

Nonetheless, refiguring and recoating is a lot of work. 

 

My guess is they tested the objectives and what your $600 bought you was one that tested better.

 

Jon


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#23 25585

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Posted 30 July 2020 - 11:31 AM

That lens in a Moonraker tube would be cool.


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#24 SeattleScott

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Posted 30 July 2020 - 01:16 PM

Nonetheless, refiguring and recoating is a lot of work.

My guess is they tested the objectives and what your $600 bought you was one that tested better.

Jon

So some cherry picking and maybe reconfiguring but not actual touch up. That makes sense.

Scott

#25 Jeff B

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Posted 30 July 2020 - 03:30 PM

So some cherry picking and maybe reconfiguring but not actual touch up. That makes sense.

Scott

Yes, it does.

 

In my hi-fi hobby, it's very common for an OEM to cherry pick the best measuring phono cartridges of a particular design/production run and relabel (and re-color) them as "deluxe", which, actually, they are.  But of course there is an up-charge associated with the harvest.  

 

Jeff




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