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Is there a 6" Newtonian with baffles?

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#1 betelgeuse91

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Posted 10 April 2019 - 09:28 PM

I look at the Astro-Tech, Orion, TPO, but they all seem to not have baffles on 6" Newtonians.

 

I am wondering if there is any 6" Newtonian with baffles that is not too expensive... 

 

Is there one..? I mean, baffles are essential for imaging, right? 


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#2 EJN

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Posted 10 April 2019 - 09:38 PM

I mean, baffles are essential for imaging, right?

 

No


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#3 TOMDEY

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Posted 10 April 2019 - 10:18 PM

Controlling stray light matters, but circular baffles going down a tube are just one way to address it. On Newtonians, blackening the interior of a not-too-skinny tube are also very effective. And having the front end of the tube not too short, and putting something extra-black right behind the folding flat (where the focuser is pointing)... stuff like that. And most certainly avoiding direct light-trespass and even seeking good dark skies. The very best baffling is... a dome!    Tom


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#4 scngc7317

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Posted 10 April 2019 - 10:21 PM

NO, No and hell No, not on Newtonian's 

 

2724

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#5 17.5Dob

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Posted 10 April 2019 - 10:25 PM


 I mean, baffles are essential for imaging, right? 

No +3


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#6 Vondragonnoggin

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Posted 10 April 2019 - 10:31 PM

6” newt - no

6” mak-newt - yes. Intes Micro MN66 has baffles, but a very small secondary. Don’t know if it would be best for imaging.


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#7 agmoonsolns

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Posted 10 April 2019 - 10:33 PM

What Vondragonnoggin said above, the Maksutov-Newtonians definitely have them.



#8 Vondragonnoggin

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Posted 10 April 2019 - 10:34 PM

Astro Tech 6” RC has them too



#9 betelgeuse91

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Posted 10 April 2019 - 10:39 PM

I see... I'm surprise to hear that the baffles are not essential for Newtonians. I had a wrong belief!

 

I gave up on the RC as I am scared of the collimation, and Maksutov-Newts are too expensive for me...

 

But if not having baffles is not big of deal, I will definitely consider a 6" Newtonian..! 


Edited by betelgeuse91, 10 April 2019 - 10:43 PM.


#10 Vondragonnoggin

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Posted 10 April 2019 - 10:44 PM

I see... I'm surprise to hear that the baffles are not essential for Newtonians. I had a wrong belief!

 

I gave up on the RC as I am scared of the collimation, and Maksutov-Newts are too expensive for me...

 

But if not having baffles are not too big of deal, I will definitely consider a 6" Newtonian..! 

A 6” F/4 is pretty critical on collimation too. Much more for the Boren-Simon version with F/2.8 reducer. Not much getting around that one at those speeds. Even the David Levy Comet Hunter from ES is pretty critical at F/4.8

 

Had a guy showing me a three hour session with the Comet Hunter and he made short work of collimating with a Hotech laser. Practice. This guy was very practiced at it.


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#11 betelgeuse91

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Posted 10 April 2019 - 10:49 PM

A 6” F/4 is pretty critical on collimation too. Much more for the Boren-Simon version with F/2.8 reducer. Not much getting around that one at those speeds. Even the David Levy Comet Hunter from ES is pretty critical at F/4.8

 

Had a guy showing me a three hour session with the Comet Hunter and he made short work of collimating with a Hotech laser. Practice. This guy was very practiced at it.

I once had a f/5 Newtonian so I am pretty confident with collimating Newtonians (I am aware that f/4 is much more sensitive to collimation but I hope I won't struggle too much..)

 

But collimating RC is something... something out of this universe. 



#12 ghostboo

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Posted 08 May 2019 - 08:59 PM

I look at the Astro-Tech, Orion, TPO, but they all seem to not have baffles on 6" Newtonians.

 

I am wondering if there is any 6" Newtonian with baffles that is not too expensive... 

 

Is there one..? I mean, baffles are essential for imaging, right? 

I have a GSO 6" f/4 Imaging Newt. No baffles but I really don't think that's a problem. I'm pretty happy with it so far. It's imperative to do a good job with collimation. Out of the box, I used a Cheshire to get a rough collimation and finally my Hotech SCA crosshair laser to finish it off. Now, I just check it with the Hotech when I get it on the mount. Takes about two minutes. Here's a couple images taken with this OTA: 

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  • M20 Newt 183 30 250 resized.jpg
  • M27 Newt 183 30 250 resized.jpg

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#13 betelgeuse91

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Posted 14 May 2019 - 03:43 PM

I have a GSO 6" f/4 Imaging Newt. No baffles but I really don't think that's a problem. I'm pretty happy with it so far. It's imperative to do a good job with collimation. Out of the box, I used a Cheshire to get a rough collimation and finally my Hotech SCA crosshair laser to finish it off. Now, I just check it with the Hotech when I get it on the mount. Takes about two minutes. Here's a couple images taken with this OTA: 

Thank you Brian for providing good examples.


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#14 SeattleScott

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Posted 15 May 2019 - 10:41 PM

Keep in mind baffles can exacerbate cool down time because they trap warm air inside the tube. Flocking does not. Mak Newt is a closed tube design so the air is already trapped anyway. Mewlon or the new classical Cassegrain at least have relatively short tubes. Not sure a fully baffled 10” Dob would ever cool down, at least without fans to push the air around.

So no, reflectors generally are not baffled. For good reason.

Scott

#15 Vondragonnoggin

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Posted 15 May 2019 - 10:51 PM

Here is a cool CN article on stray light control in a Newtonian 

 

https://www.cloudyni...elescopes-r2006

 

Talks about where baffling might be helpful and what isn’t needed.




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