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Lightweight F4-F6 150mm/6" Newtonian OTA for Child

beginner observing outreach reflector
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#1 Spacefreak1974

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Posted 12 June 2019 - 07:02 AM

Hello

My 10yr old currently uses a 4.5" F/4 Newtonian on a GSO SKyview Deluxe ALt/Az mount. Its pretty much the perfect scope for a child given adjustable eyepiece height, lightweight, etc other than one thing and that is aperture. I'd like to get a lightweight 6" newtonian for him that'll still work well on the GSO Skyview Deluxe (similar to a Porta 2 from Vixen).

 

I'd also like to keep the costs down as well

 

Anyone have any recommendations?

 

Jon



#2 KerryR

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Posted 12 June 2019 - 07:43 AM

A 150mm f5 would push that mount a bit. It'd work for low and moderate powers, and there'd be tube/tripod interference.

A 130mm f5 would work nicely, but it's not much of an aperture gain. Detectable, but not a significant upgrade.

Honestly, if you want a 6", I'd move to an f8 Dob-- it'd be much better mounted, be a nice jump up in aperture, and behave optically very differently to the 4.5" f4.

 



#3 SeattleScott

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Posted 16 June 2019 - 11:22 AM

I am with Kerry. If you don’t care about vibrations you could stick a 6” F5 on there, but you are getting close to the capacity of the mount. Even if you could still get an AZ4 for $200 and a 6” F5 with 2” focuser for $220, that would still be $20 more than an 8” Dob. So if you want to go bigger you are looking at a 6” or 8” Dob.

Scott

#4 kfiscus

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Posted 16 June 2019 - 05:55 PM

I'd recommend the Orion XT6 if you could accept an f/8 dob.  The 2 pieces are a combined 34 pounds.  They can be gotten used for $150, new they're $300.


Edited by kfiscus, 16 June 2019 - 06:01 PM.


#5 GoFish

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Posted 16 June 2019 - 06:30 PM

I have a Celestron Omni XLT 150, 6” f/5 Newtonian that I like very much. I bought it used. You should be able to find one for $150 or less, plus shipping, here on CN or maybe AstroMart. 

 

Based on a sample of one, this is a heckuva scope for the price. I can’t speak to whether your mount can support it effectively. 



#6 tomykay12

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Posted 16 June 2019 - 06:40 PM

My 150 xlt rides pretty nicely on a CG-4; I really don't see it behaving nicely on a lesser mount.



#7 Sky Muse

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Posted 16 June 2019 - 07:09 PM

Hello

My 10yr old currently uses a 4.5" F/4 Newtonian on a GSO SKyview Deluxe ALt/Az mount. Its pretty much the perfect scope for a child given adjustable eyepiece height, lightweight, etc other than one thing and that is aperture. I'd like to get a lightweight 6" newtonian for him that'll still work well on the GSO Skyview Deluxe (similar to a Porta 2 from Vixen).

 

I'd also like to keep the costs down as well

 

Anyone have any recommendations?

 

Jon

There's actually one more aspect of that 114mm, it's an f/4, and more difficult to collimate, not to mention the difficulty in reaching the higher powers of which an 114mm aperture is capable.

 

I have the same mount as your own, older, and in white, but with a pier, and here with a 6" f/5 Newtonian mounted upon it...

 

6 f5r.jpg

 

The pier actually benefits a longer telescope, like a long-focus refractor or Newtonian...

 

072118 - First Light.jpg

 

...with that being a 114mm f/8 Newtonian.

 

I've had no trouble observing with the 6" f/5 on that mount, not at all. It performs much better as a matter of fact than when it was attached to its original mount...

 

6 f5w2.jpg

 

A 6" f/5 OTA...

 

https://www.highpoin...ShoC4L0QAvD_BwE

 

If you go with a 6" f/8 "Dobsonian", I would suggest this one over the Orion...

 

https://www.astronom...ope-s11600.html

 

...although the eyepieces will be positioned a bit higher perhaps, depending.  It comes with a 1.25"/2" metal focusser.  That of the Orion 6" f/8 is a 1.25" only, and of plastic.  The Orion does have the better primary-cell, spring-loaded, but that of the Sky-Watcher can be far more easily renovated, with metal springs, than the plastic focusser of the Orion.


Edited by Sky Muse, 16 June 2019 - 07:09 PM.


#8 SeattleScott

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Posted 16 June 2019 - 09:32 PM

That looks like a better tripod than he has. Looks like the old Astrotech Voyager. Those were nice GNG mounts. I didn’t get one in time. The tripod reminds me of my HAL130. I’m sure it isn’t that stable, but the design looks similar. I would expect that mount to handle a 6” F5 based on my research. Not so sure about his mount, based on the picture I googled, and a buddies experience.

Scott


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