Question For Newtonian Telescope Owners

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Refractordude
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Question For Newtonian Telescope Owners

#1

Post by Refractordude »


What is your opinion? Right click the image.

Thanks to you all
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notFritzArgelander
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Re: Question For Newtonian Telescope Owners

#2

Post by notFritzArgelander »


It's true. Atmospheric seeing is often the factor limiting resolution. In the US most places rarely get 0.5" seeing that a 10" scope would make use of. Average seeing has a 1-2" diffraction disk caused by the atmosphere so a telescope of 5" aperture is enough.

But this only applies to resolution. More aperture will always give a brighter image.
Scopes: Refs: Orion ST80, SV 80EDA f7, TS 102ED f11 Newts: AWB 130mm, f5, Z12 f5; Cats: VMC110L, Intes MK66,VMC200L f9.75 EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binoculars: Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker IV, Vixen Porta II, Celestron CG5
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Re: Question For Newtonian Telescope Owners

#3

Post by Lady Fraktor »


This is about average air cell size than telescope design. SCT are affect the same.
Any telescope over 6" will show more turbulence on poor nights but 4" telescopes will still be more useful for a longer time.
See Far Sticks: Antares Elita 103/1575, AOM FLT 105/1000, Bresser BV 127/1200, Nočný stopár 152/1200, Vyrobené doma 70/700, Stellarvue NHNG DX 80/552, TAL RS100/1000, Vixen SD115s/885
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Re: Question For Newtonian Telescope Owners

#4

Post by notFritzArgelander »


Lady Fraktor wrote: Thu Feb 27, 2020 5:10 am This is about average air cell size than telescope design. SCT are affect the same.
Any telescope over 6" will show more turbulence on poor nights but 4" telescopes will still be more useful for a longer time.
Exactly. It has nothing to do with Newtonians and everything to do with the aperture of whatever the optics are.
Scopes: Refs: Orion ST80, SV 80EDA f7, TS 102ED f11 Newts: AWB 130mm, f5, Z12 f5; Cats: VMC110L, Intes MK66,VMC200L f9.75 EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binoculars: Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker IV, Vixen Porta II, Celestron CG5
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kt4hx United States of America
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Re: Question For Newtonian Telescope Owners

#5

Post by kt4hx »


Well I can tell you, at my dark site, I almost exclusively use my 17.5 inch dob. As nFA mentioned I am after light grasp because the vast majority of my targets are galaxies and other extended objects. While seeing is certainly important to me in this quest, transparency is the primary factor I look at for my observing. But on nights when seeing is horrid, I can attest to the fact that its a struggle to focus stars in the big fella while using over 200x, and sometimes less than that. On such evenings, smaller details within a galaxy can escape my detection because of poor resolution. However, on steadier nights I can push up to around 400x+ and still easily focus stars, which does yield the resolution needed for pulling out the smaller details within some galaxies.
Alan

Scopes: Astro Sky 17.5 f/4.5 Dob || Apertura AD12 f/5 Dob || Zhumell Z10 f/4.9 Dob ||
ES AR127 f/6.5 || ES ED80 f/6 || Apertura 6" f/5 Newtonian
Mounts: ES Twilight-II and Twilight-I
EPs: AT 82° 28mm UWA || TV Ethos 100° 21mm and 13mm || Vixen LVW 65° 22mm ||
ES 82° 18mm || Pentax XW 70° 10mm, 7mm and 5mm || barlows
Filters (2 inch): DGM NPB || Orion Ultra Block, O-III and Sky Glow || Baader HaB
Primary Field Atlases: Uranometria All-Sky Edition and Interstellarum Deep Sky Atlas
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Re: Question For Newtonian Telescope Owners

#6

Post by helicon »


I have noticed that on nights of poor seeing my 6" scope will apparently produce sharper images than my 10" - but this difference is outweighed by the fact that the larger scope gathers much more light and with decent transparency will always outperform the 6" on fainter and distended objects...
-Michael
Refractors: ES AR152 f/6.5 Achromat on Twilight II, Celestron 102mm XLT f/9.8 on Celestron Heavy Duty Alt Az mount, KOWA 90mm spotting scope
Binoculars: Celestron SkyMaster 15x70, Bushnell 10x50
Eyepieces: Various, GSO Superview, 9mm Plossl, Celestron 25mm Plossl
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