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Who has some experiences with the JMI NGT-12.5?

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#1 Mikoka

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Posted 25 July 2021 - 07:25 AM

Hello,

 

I have an offer for a  JMI NGT-12.5.

That scope was a dream-scope for me in the later 90 years of the last century.

But unfortunately much to expensiv.......

I can purchase an used one now; it should get some refreshing, but is in acceptable condition.

I would ask you, who are owners and users of that scope, now or in the past, for some experiences

with this scope (handling, observing of deep sky objekts , planets and the moon).

I hope, that these experiences will help me to make my decision to buy it or not.

 

Thank you very much and best regards   Michael



#2 randcpoll

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Posted 25 July 2021 - 08:48 AM

As you noted, the technology is ancient by today's standards. However, I had the chance to use one in Australia for a while 15+ years ago. I thought it was a marvelous instrument with nice, sharp stars and excellent tracking. As a Newtonian it is easy to collimate. It was a bit power hungry, but if you have AC available that is not a problem. Even unguided I got some beautiful images on film with that scope even though focusing wasn't perfect. Here is one greatly reduced for CN.

 

  

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#3 Mikoka

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Posted 25 July 2021 - 09:28 AM

Oh, thank you very much for your replie, randcpoll,

if I purchase it, I will use it for visual observing mainly.

Very nice picture  :-)

 

Best regards  Michael



#4 Starman1

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Posted 25 July 2021 - 12:31 PM

Having tracking will allow you to use narrower field eyepieces, at much higher powers, than using a simple dob on an alt-az mount without tracking.

From that standpoint, it is important to become expert in collimation, mirror cooling, and polar alignment, because the instrument is capable of magnifications up to 600-700x in a wind-free environment.

I also recommend a coma corrector if the scope is f/5 or shorter to yield better star images--especially if using wide, ultrawide, or hyperwide eyepieces.



#5 Mikoka

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Posted 26 July 2021 - 07:15 AM

Hi Don,

 

thank you very much - sounds pretty good.

 

regards  Michael




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