Question For 6" Achromatic Owners

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Refractordude
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Question For 6" Achromatic Owners

#1

Post by Refractordude »


What 6" achromatic telescope do you own? How do you bring out the colors when observing globular clusters at high magnification? My thinking is that at high magnification the violet color of an achromatic would be a problem. Yes dark skies, but what about some type of filter? Perhaps a filter will ruined true colors of the cluster.
Last edited by Refractordude on Thu Jun 18, 2020 5:43 pm, edited 1 time in total.
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Lady Fraktor Slovakia
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Re: Question For 6" Achromatic Owners

#2

Post by Lady Fraktor »


I have a Celestron 150mm f/8, the best thing for spotting the subtle shadings in a globular are very dark skies and well dark adapted eyes.
Some people see a warmer tones and some seem to see a cooler tone.
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
EQ: TAL MT-1, Vixen SXP, AXJ, AXD
Az/Alt: AYO Digi II/ Argo Navis, Stellarvue M2C/ Argo Navis
Tripods: Berlebach Planet (2), Uni 28 Astro, Report 372, TAL factory maple, Vixen ASG-CB90, Vixen AXD-TR102
Diagonals: Astro-Physics, Baader Amici, Baader Herschel, iStar Blue, Stellarvue DX, Takahashi prism, TAL, Vixen flip mirror
Eyepieces: Antares to Zeiss
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John Baars Netherlands
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Re: Question For 6" Achromatic Owners

#3

Post by John Baars »


I own a f/5
I can't remember having seen colors with it in Globular clusters. not even in a 14 inch SCT.
CA is not visible for me in the f/5 on stars fainter than magnitude 4- 5. I have never been a champion in seeing colors, so I see no colors in globulars.
Sometimes some color in the Lucida of small open cluters, sometimes in extended open clusters. The red stars in the double Perseus cluster are a good example of the latter.
Refractors in frequency of use : *SW Evostar 120ED F/7.5 (all round ), * Vixen 102ED F/9 (vintage), both on Vixen GPDX.
GrabnGo on Alt/AZ : *SW Startravel 102 F/5 refractor( widefield, Sun, push-to), *OMC140 Maksutov F/14.3 ( planets).
Most used Eyepieces: *Panoptic 24, *Morpheus 14, *Leica ASPH zoom, *Zeiss barlow, *Pentax XO5.
Commonly used bino's : *Jena 10X50 , * Canon 10X30 IS, *Swarovski Habicht 7X42, * Celestron 15X70, *Kasai 2.3X40
Rijswijk Public Observatory: * Astro-Physics Starfire 130 f/8, * 6 inch Newton, * C9.25, * Meade 14 inch LX600 ACF, *Lunt.
Amateur astronomer since 1970.
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notFritzArgelander
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Re: Question For 6" Achromatic Owners

#4

Post by notFritzArgelander »


6” is too small an aperture to see colors in a globular cluster for me. Sometimes if the seeing is extremely fine I can get a pale hint of color in the 12”. To get really good color saturation needs 20-40” aperture to my eyes.
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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helicon United States of America
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Re: Question For 6" Achromatic Owners

#5

Post by helicon »


In my 6" achro I have not seen colors in globular clusters. I have noticed spectacular differences in color with open clusters, e.g., Beehive, M52, and the Double Cluster, among others. I believe the individual stars in globulars (magnitude 12.5 - 14 and fainter) are too faint to show coloration.
-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
Camera: ZWO ASI 120
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Re: Question For 6" Achromatic Owners

#6

Post by notFritzArgelander »


helicon wrote: Fri Jun 26, 2020 5:06 pm In my 6" achro I have not seen colors in globular clusters. I have noticed spectacular differences in color with open clusters, e.g., Beehive, M52, and the Double Cluster, among others. I believe the individual stars in globulars (magnitude 12.5 - 14 and fainter) are too faint to show coloration.
So with a 40" scope you get about an 11 magnitude gain and you can start to match the colors on bright stars that the unaided eye can see.
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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