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Poor stars with Esprit 80ED

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#1 milkychris

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Posted 21 January 2020 - 11:24 PM

I purchased a new Esprit 80ED and am disappointed so far with the stars. I am using a ASI183MM Pro camera and the stars are jagged and there is an uneven halo around the bright stars.

 

I have tried the same camera setup on my AT60ED and am happy with it.

 

Here are a couple pics comparing the same stars on the different scopes.  The first one is a single 10 second exposure from the Esprit and the second one is a 60 second exposure from the AT60ED. 

 

What could be causing the Esprit stars to look so much worse?

Attached Thumbnails

  • M45 Esprit80ED.jpg
  • M45 AT60ED.jpg


#2 tonyt

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Posted 21 January 2020 - 11:46 PM

A little too much pressure from the centering screws - needs adjustment by the manufacturer. See here: http://interferometr...ml?view=sidebar


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#3 ezwheels

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Posted 22 January 2020 - 12:50 AM

Tony,

 

That is quite the link you shared. They are offering a pretty great service for Esprit buyers in the EU. I wonder if this is how they test and tune all the Esprits that they sell?



#4 tonyt

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Posted 22 January 2020 - 05:20 AM

It seems like they do check and if necessary adjust each esprit - certainly adds some value. However if you get an esprit with collimation issues skywatcher quickly takes care of it if you send them a photo of a star.



#5 SilverLitz

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Posted 22 January 2020 - 09:11 AM

Last night, I saw something similar with the Esprit 100 for the 1st time, but I suspect it was temperature related, as temps were <20degF.



#6 Stephen Kennedy

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Posted 22 January 2020 - 07:22 PM

The spikes coming from the bright star are very asymetrical which would lead me to believe that at least one of the lenses is not orthagonal to the light from the star.  This telescope has a major defect and needs to go back to the factory for repair.



#7 milkychris

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Posted 22 January 2020 - 07:58 PM

Last night, I saw something similar with the Esprit 100 for the 1st time, but I suspect it was temperature related, as temps were <20degF.


I am in touch with the manufacturer and they mentioned that temperature can cause some of this. But I’m in Florida and took pics at 65 and 50F. I didn’t see a difference. They both looked bad.


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#8 milkychris

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Posted 08 March 2020 - 09:35 PM

Skywatcher gave me a new scope and it is certainly better than the last but I am still disappointed.  I put three different cameras on it with completely different spacers to rule out tilt from anything after the flattener and they all have the same issue with an asymmetrical halo on bright stars  These cameras have no issue on my AT60ED.  Below is a pic comparing them on the Esprit where I only adjusted the left side of the histogram.  I guess I got another dud?  I'm really frustrated right now.

Attached Thumbnails

  • esprit star compare.jpg


#9 Brule

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Posted 08 March 2020 - 10:17 PM

Skywatcher gave me a new scope and it is certainly better than the last but I am still disappointed.  I put three different cameras on it with completely different spacers to rule out tilt from anything after the flattener and they all have the same issue with an asymmetrical halo on bright stars  These cameras have no issue on my AT60ED.  Below is a pic comparing them on the Esprit where I only adjusted the left side of the histogram.  I guess I got another dud?  I'm really frustrated right now.

Sorry to hear about your frustrations. I had this exact problem where stars "flared" out in one direction. I reached out to them and they sent me a replacement (took 3 months unfortunately as they had sold out over the holidays). I got lucky with the replacement as it no longer had this issue, but while waiting I ended up buying an alternative scope which I'm now using going forward for wide-field, so will probably just cut my loses and sell the Esprit.

 

Anyway, I know this doesn't really help you, but you're not alone. I would reach out to them again with this evidence, and I hope you're lucky on the 3rd replacement.



#10 milkychris

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Posted 09 March 2020 - 12:19 AM

Yeah I’m not sure if I want to try my luck with a third one at this point.  I think I’ll just get a refund and stick with my AT scope.  Besides the star issues the first one had debris on the back side of the lens and the fine focuser knob came right off it. When I unwrapped this second scope there was a hex bolt in the protective wrapping that was from the focuser, they must have forgot to screw it in during assembly.  Minor issues but not the kind of QC I was expecting.


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