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Thinking of spending $$$ on a refractor?

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28 replies to this topic

#1 RichA

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Posted 20 September 2022 - 11:49 PM

Look what this fellow did with a $2000 Chinese Newtonian:

 

https://www.astrobin...5520.1663733882

 

I've owned only 2 Newtonians (out of 200+ scopes) but this is...respectable!

 


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#2 Polyphemos

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Posted 20 September 2022 - 11:51 PM

Impressive!



#3 steveward53

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Posted 21 September 2022 - 12:01 AM

10" beats 6" everytime , in every situation ... wink.gif


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#4 jlinsobe

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Posted 21 September 2022 - 12:09 AM

Wow, impressive.  And not that heavy. 
EQR8 hmmm.

 

I just read that  those are made in Germany 

https://en.lacerta-o...kularauszug--#m

 

Listed at 1,950 usd, but sold out


Edited by jlinsobe, 21 September 2022 - 12:16 AM.


#5 photomagica

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Posted 21 September 2022 - 12:39 AM

A well designed Newtonian with a truly excellent mirror and secondary and good thermal management is really hard to beat.

Bill


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#6 steveward53

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Posted 21 September 2022 - 12:57 AM

Wow, impressive.  And not that heavy. 
EQR8 hmmm.

 

I just read that  those are made in Germany 

https://en.lacerta-o...kularauszug--#m

 

Listed at 1,950 usd, but sold out

It's this one , the 254/1200 actually ... wink.gif

 

https://szolnoktavcs...r-belessel-2646

 

The carbon tube's made in Germany and assembled in Austria . Skywatcher optics.


Edited by steveward53, 21 September 2022 - 12:58 AM.


#7 larrytOMC200

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Posted 21 September 2022 - 02:05 AM

One of the best images I have ever seen. Very well done.  Larry



#8 RichA

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Posted 21 September 2022 - 03:59 AM

A well designed Newtonian with a truly excellent mirror and secondary and good thermal management is really hard to beat.

Bill

If you measure  the detail in that shot, work out the arc sec diameter, closest I've seen was a heavy optimized C14 on Mars.



#9 RichA

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Posted 21 September 2022 - 04:02 AM

It's this one , the 254/1200 actually ... wink.gif

 

https://szolnoktavcs...r-belessel-2646

 

The carbon tube's made in Germany and assembled in Austria . Skywatcher optics.

Jean Dragesco said 1 night in 30 will produce that kind of detail on planets.  A top-notch 7 inch refractor might, just might match it but it would still be harder to capture photographically because although Jupiter is a bright planet, the delineation of subtle colour shades needs aperture and superb seeing.


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#10 firemachine69

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Posted 21 September 2022 - 06:55 AM

Wow, impressive.  And not that heavy. 
EQR8 hmmm.

 

I just read that  those are made in Germany 

https://en.lacerta-o...kularauszug--#m

 

Listed at 1,950 usd, but sold out

 

 

We have an eqr8 in our club. Currently disassembled because the screws rusted out. 



#11 t.r.

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Posted 21 September 2022 - 07:51 AM

Why is this posted in the refractor forum…the “Topic” twist doesn’t meet the standard for posting it here?
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#12 JerryX

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Posted 22 September 2022 - 06:27 PM

Especially impressive that it's an f/4.7.



#13 sdedalus83

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Posted 22 September 2022 - 07:07 PM

Jean Dragesco said 1 night in 30 will produce that kind of detail on planets.  A top-notch 7 inch refractor might, just might match it but it would still be harder to capture photographically because although Jupiter is a bright planet, the delineation of subtle colour shades needs aperture and superb seeing.

I doubt I get seeing like that one night in 3000.


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#14 alnitak22

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Posted 22 September 2022 - 07:12 PM

Why is this posted in the refractor forum…the “Topic” twist doesn’t meet the standard for posting it here?

Maybe because Rich thinks refractor-philes need to see it! I agree.


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#15 alnitak22

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Posted 22 September 2022 - 07:12 PM

Look what this fellow did with a $2000 Chinese Newtonian:

 

https://www.astrobin...5520.1663733882

 

I've owned only 2 Newtonians (out of 200+ scopes) but this is...respectable!

Astonishing.



#16 BlueTrane2028

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Posted 22 September 2022 - 07:17 PM

We all know that refractors have a max size before they become a real issue for handling and mounting (also price), and the 10" used for that pic is above that level for most people.

There's nothng wrong with having a mix of types.

Fantastic image, thanks for sharing it.


Edited by BlueTrane2028, 22 September 2022 - 07:18 PM.


#17 Tkall

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Posted 22 September 2022 - 07:36 PM

I bet he had a hard time escaping Jupiter's gravity after he shot that.


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#18 Suavi

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Posted 22 September 2022 - 09:42 PM

Very nice image but overcooked IMHO. To much de-noise and too much sharpening. Here is a link to the same data prior to mathematical transformations: https://www.astrobin.../full/dv8k41/0/
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#19 M44

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Posted 22 September 2022 - 10:00 PM

"Thinking of spending $$$ on a refractor?"

 

Yes. I do. 

 

I usually avoid even imaging topics of refractors in this forum. I don't click.

This one made me click and it changes nothing. For me of course. 


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#20 nicknacknock

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Posted 23 September 2022 - 12:09 AM

This topic is about reflectors, hence it is better served in the reflectors forum.


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#21 Bill Weir

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Posted 23 September 2022 - 02:38 AM

What this image (actually the second one) does is confirm what I was just seeing tonight with my 150mm dob. The GRS is very dark and condensed this year. It close to the meridian and watching the total process of Io reappearing from behind Jupiter was a fun time. 

 

Bill


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#22 Ihtegla Sar

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Posted 23 September 2022 - 03:06 AM

Very nice image but overcooked IMHO. To much de-noise and too much sharpening. Here is a link to the same data prior to mathematical transformations: https://www.astrobin.../full/dv8k41/0/


What I find most impressive about either version are the albedo features visible on Ganymede but I would tend to agree with your assessment. The version linked in the OP looks like an oil painting whereas this one looks like a photo.

Edited by Ihtegla Sar, 23 September 2022 - 03:10 AM.


#23 bobhen

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Posted 23 September 2022 - 04:01 AM

Look what this fellow did with a $2000 Chinese Newtonian:

 

https://www.astrobin...5520.1663733882

 

I've owned only 2 Newtonians (out of 200+ scopes) but this is...respectable!

 

Why is this posted in the refractor forum…the “Topic” twist doesn’t meet the standard for posting it here?

 

Maybe because Rich thinks refractor-philes need to see it! I agree.

This is a wonderful and detailed image that shows the imager's skill at data collection and post processing. However, it is "decades old news" that large, "decent or average" quality optics (not even excellent optics) coupled with "today's digital capture and post processing" techniques can produce detailed planetary "images" that exceed what small aperture scopes (including refractors) can produce when "used for planetary imaging".

 

These modern planetary images are all about the digital revolution, not optical quality or visual observing. Have a look at the 1974 Celestron catalog and see what Celestron thinks high quality planetary images look like. Same optics as today, only the digital capture and post processing capabilities are new.

 

Every refractor or small aperture telescope owner already knows this and has known this for decades. This wonderful image probably should have been posted in the reflector or imaging forums. 

 

Top image Jupiter with a C8. Bottom image Saturn with a C14. From the 1974 Celetsron catalog. 

 

Bob

Attached Thumbnails

  • C8 planetary image 1974.jpg
  • Celestron planetary image C14 1974.jpg

Edited by bobhen, 23 September 2022 - 04:01 AM.

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#24 Nippon

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Posted 23 September 2022 - 08:14 AM

"Thinking of spending $$$ on a refractor?"

 

Yes. I do. 

 

I usually avoid even imaging topics of refractors in this forum. I don't click.

This one made me click and it changes nothing. For me of course. 

I too avoid imaging topics. Almost all Newtonians these days are either Dobsonian type or they are optimized for imaging. Bring back the Newtonian OTAs of the past in the F/6 and F/8 F ratios designed for visual observing and I would certainly be a fan. Until then I'll keep my 4" refractor and 180mm Mewlon.


Edited by Nippon, 23 September 2022 - 08:14 AM.

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#25 NinePlanets

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Posted 23 September 2022 - 08:30 AM

bobhen

> These modern planetary images are all about the digital revolution, not optical quality or visual observing.

...

> Every refractor or small aperture telescope owner already knows this and has known this for decades.

 

Bob

 

 

 

Bingo!  [smile.gif]


Edited by NinePlanets, 23 September 2022 - 08:32 AM.



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