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

beginner observing outreach reflector
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#1 Spacefreak1974

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.

 




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