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The AT92

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1270 replies to this topic

#1226 Astrojedi

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Posted 01 April 2020 - 11:36 AM

Unfortunately not that young anymore but not too old yet. : )

 

I found that the image was relatively bright. I think I hit a good patch of seeing - not unusual here and makes all the difference. on nights like this my EdgeHD 8 can easily do 600x on the moon and provides incredibly sharp views.

 

There were some floaters and the dust motes on the EP / Barlow glass were quite obvious as well. But after a few seconds I am so engrossed in the view that I think my brain filters them out to some extent. 



#1227 honyi

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Posted 27 April 2020 - 12:45 PM

Can the 2" clamp at the end of the focuser be removed, in order to have threads for screwing in an imaging train? Thanks!



#1228 ChrisWhite

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Posted 27 April 2020 - 09:56 PM

Can the 2" clamp at the end of the focuser be removed, in order to have threads for screwing in an imaging train? Thanks!


Yes. There are three grub screws to loosen and the compression mount unthreads.

The draw tube is 68mm x 1 thread. (Same as moonlite)
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#1229 X-Lurker

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Posted 27 April 2020 - 10:21 PM

I’m in the market for a new refractor, but been out of the loop for quite some time... So would someone please explain to me why the AT92 has a higher price than the AT115?


Edited by X-Lurker, 27 April 2020 - 10:28 PM.


#1230 rkaufmann87

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Posted 27 April 2020 - 11:54 PM

I’m in the market for a new refractor, but been out of the loop for quite some time... So would someone please explain to me why the AT92 has a higher price than the AT115?

Astronomics says it right in their advertisement:

 

"If you are looking for the best fast focal ratio/compact APO refractor that Thomas Back and Roger Ceragioli could create, then look no further."


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#1231 desertlens

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Posted 28 April 2020 - 12:31 AM

I’m in the market for a new refractor, but been out of the loop for quite some time... So would someone please explain to me why the AT92 has a higher price than the AT115?

Roger has posted a concise answer to your question. I'd emphasize that this scope is very fast and very well color corrected... not easily accomplished. If you've been out of the loop for a while, you may not know that Thomas Back (deceased too soon) and Roger Ceragioli are well respected as optics designers. Both have or had longstanding relationships with Astronomics, for whom the scope was designed. There's some interesting background info on the Astronomics site.


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#1232 X-Lurker

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Posted 28 April 2020 - 07:00 PM

Roger has posted a concise answer to your question. I'd emphasize that this scope is very fast and very well color corrected... not easily accomplished. If you've been out of the loop for a while, you may not know that Thomas Back (deceased too soon) and Roger Ceragioli are well respected as optics designers. Both have or had longstanding relationships with Astronomics, for whom the scope was designed. There's some interesting background info on the Astronomics site.

Very interesting... So how are they able to do this color correction with what seems to be a lesser quality of glass? Are they able to grid/polish and configure the glass in such a way that it’s superior than what other mass produced scope mfg’s can achieve with higher quality glass? Please forgive my ignorance, I’m finding this fascinating and I’m even more excited about this scope. 



#1233 rkaufmann87

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Posted 28 April 2020 - 07:09 PM

Very interesting... So how are they able to do this color correction with what seems to be a lesser quality of glass? Are they able to grid/polish and configure the glass in such a way that it’s superior than what other mass produced scope mfg’s can achieve with higher quality glass? Please forgive my ignorance, I’m finding this fascinating and I’m even more excited about this scope. 

Perhaps you should call Astronomics, however they do not use a lesser quality of glass. They use "It is a triplet with a center element of FCD100 (ED), one mating element of LAL14 (Lanthanum), and then a third element." according to Astronomics. It's a great scope, if I could I would have one myself.


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#1234 desertlens

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Posted 28 April 2020 - 08:10 PM

Very interesting... So how are they able to do this color correction with what seems to be a lesser quality of glass? Are they able to grid/polish and configure the glass in such a way that it’s superior than what other mass produced scope mfg’s can achieve with higher quality glass? Please forgive my ignorance, I’m finding this fascinating and I’m even more excited about this scope. 

To begin with, FCD-100 and FPL-53 are virtually identical and both have close to the same Abbe number (a measure of dispersion) as Fluorite (the benchmark), so there's nothing inferior about the glasses used. The optical prescription and the manufacturing specifications (Strehl .95+, etc.) are carefully managed by 2 excellent designers and Michael at Astronomics. The AT92 is made in small batches, not mass produced. I can say without equivocating that his is a high quality scope for the way I use it, visual only.


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#1235 Astrojedi

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Posted 28 April 2020 - 08:18 PM

The AT92 is an excellent scope. It has better color correction than my Tak doublets and nearly just as sharp. In my opinion a compact triplet of such high quality glass and figure at this price is excellent value for money. Of course it is not for everyone as each person has their own priorities and hence their own definition of value.


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#1236 X-Lurker

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Posted 28 April 2020 - 10:29 PM

Thanks for the clarification! But some how I’ve overlooked where it points this out? So where does it describe the type of glass used? All I can find is this “92mm f/5.5 apochromatic triplet optics using an ED/Lanthanum combination” and this “It uses an ED (Extra-low Dispersion) glass center element in combination with a rear Lanthanum element for a sharp images that are high in contrast and free from spurious color (chromatic aberration).” 



#1237 rrice

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Posted 28 April 2020 - 10:57 PM

Hi!
   I have a  6 month old HEQ-5 with my fantastic AT 92, ASI533 MC color pro, ASIAIR PRO and the ZWO guide scope with a ASI292 guide camera. Here at sea level.
   It is simply a great set up, easy to move, simple PA, All great equipment and software.

    Truly happy with my new AT92, great focuser, build, lenses and Mike is good to work with.

Robin

 

observatory at 6800 ft in Santa Fe, NM.

to much stuff to list, but the AT92 is now going on the big mount!


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#1238 gene 4181

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Posted 28 April 2020 - 11:09 PM

It is a triplet with a center element of FCD100 (ED), one mating element of LAL14 (Lanthanum), and then a third element.

 Here we are X Lurker  ,  1 st page ,  #4


Edited by gene 4181, 28 April 2020 - 11:10 PM.


#1239 rkaufmann87

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Posted 29 April 2020 - 12:40 AM

Thanks for the clarification! But some how I’ve overlooked where it points this out? So where does it describe the type of glass used? All I can find is this “92mm f/5.5 apochromatic triplet optics using an ED/Lanthanum combination” and this “It uses an ED (Extra-low Dispersion) glass center element in combination with a rear Lanthanum element for a sharp images that are high in contrast and free from spurious color (chromatic aberration).” 

Right in this thread, please click https://www.cloudyni...84898-the-at92/



#1240 X-Lurker

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Posted 29 April 2020 - 08:30 AM

 Here we are X Lurker  ,  1 st page ,  #4

Thank you!



#1241 ChrisWhite

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Posted 12 May 2020 - 10:26 PM

For those wondering which field flattener to get, I recently tested the Esprit 100 field flattener.  The Esprit is a pretty similar spec scope to the AT92.  The flattener worked very well. 

 

Link to my imaging thread for this scope.  https://www.cloudyni...ope/?p=10185575

 

Here is the result with a QSI6129.  Stars are also round in the OAG, so correction is pretty good. 

 

AA.JPG


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#1242 elmiko

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Posted 12 May 2020 - 11:36 PM

Looking really good Chris! What is the backspace distance?



#1243 ChrisWhite

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Posted 13 May 2020 - 05:18 AM

Looking really good Chris! What is the backspace distance?


56mm. So right on spec with the field flattener plus 1mm for filters.

#1244 elmiko

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Posted 21 June 2020 - 05:45 PM

Chris, which screws do I remove the green or red?

Attached Thumbnails

  • 20200621_154513.jpg


#1245 RogeZ

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Posted 21 June 2020 - 06:27 PM

Green. That will show the M68 flange which can also be removed for a M63 drawtube connection.
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#1246 elmiko

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Posted 21 June 2020 - 07:56 PM

Green. That will show the M68 flange which can also be removed for a M63 drawtube connection

When I removed those 3 screws it was the inside of the focuser tube. It has female threads.


Edited by elmiko, 21 June 2020 - 07:59 PM.


#1247 RogeZ

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Posted 21 June 2020 - 10:15 PM

There are 3 more screws to get to the drawtube...

You are at the flange which is M68.
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#1248 elmiko

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Posted 22 June 2020 - 11:55 AM

Thanks Roger!



#1249 elmiko

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Posted 24 August 2020 - 08:41 AM

get.jpg?insecure

 

I reprocessed this image. It's been cloudy and smoke from wildfires outside of the Phoenix area. 


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#1250 CHASLX200

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Posted 25 August 2020 - 06:06 PM

get.jpg?insecure

 

I reprocessed this image. It's been cloudy and smoke from wildfires outside of the Phoenix area. 

That is crazy good. I mean who could have done that back in the 70's with a much bigger scope?
 


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