Jupiter looks soft/fuzzy at 133x in 4" parabolic reflector?
- Lady Fraktor
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Re: Jupiter looks soft/fuzzy at 133x in 4" parabolic reflector?
The lunar surface can take ridiculous amounts of magnification at times so you cannot judge magnification of other objects by it.
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See Far Sticks: Elita 103/1575, AOM FLT 105/1000, Bresser 127/1200 BV, Nočný stopár 152/1200, Vyrobené doma 70/700, Stellarvue NHNG DX 80/552, TAL RS 100/1000, Vixen SD115s/885
EQ: TAL MT-1, Vixen SXP, SXP2, AXJ, AXD
Az/Alt: AYO Digi II, Stellarvue M2C, Argo Navis encoders on both
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, Tak prism, TAL, Vixen
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- StarBru
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Re: Jupiter looks soft/fuzzy at 133x in 4" parabolic reflector?
realflow100 wrote: ↑Fri May 15, 2020 3:55 am "and with a telescope the faintest DSO I can see is orion nebula and andromeda galaxy. and just barely otherwise im limited to just a few clusters and mostly stars like pleiades is really bright and easy to see stars with my telescope at lower magnifications. cant really see any other galaxies or DSO."
I just recently was able to see M104, the Sombrero Galaxy, at a magnification of 40x using a 10mm eyepiece in my inexpensive Meade 80mm
Also, for example, other
Bruce
Refractors: Meade AR-5 127mm f/9.3, Meade ST-80 f/5 and Meade 60mm f/12, Jason 60mm f/15 #313, Jason 60mm f/12 #306 S7, Bushnell Sky Chief III 60mm f/15.
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Refractors: Meade AR-5 127mm f/9.3, Meade ST-80 f/5 and Meade 60mm f/12, Jason 60mm f/15 #313, Jason 60mm f/12 #306 S7, Bushnell Sky Chief III 60mm f/15.
Reflectors/Catadioptrics: Meade 10" F/4 Schmidt-Newtonian, Galileo 120mm f/8.3 Newtonian, Meade 2045D 4" f/10 SCT, Meade ETX-90EC f/13.8 & Sarblue 60mm f/12.5 Maksutov-Cassegrains.
Mounts: Skywatcher EQ6-R Pro & Meade LXD55 Equatorial mounts, ES Twilight II and Meade 2102 ALT/AZ mounts, a modified 10" SkyQuest Dobsonian mount, various 60mm EQ mounts.
Misc: Celestron 20x80mm binoculars, Revolution II Imager/accessories, & lots of optical accessories/eyepieces.
Projects: 8" f/2.9 and 65mm f/10 reflectors, Dobson-style binocular mirror mount.
- realflow100
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Re: Jupiter looks soft/fuzzy at 133x in 4" parabolic reflector?
I live in a heavily light polluted area. so all I can see is the VERY BRIGHTEST OF THE BRIGHTEST deep sky objects. and I have no chance of escaping it. no working vehicle to drive anywhere. and its this bad for at least 10 mile radius. so no walking either.
naked eye its somewhere between abortle 5 to bortle 9 depending on where im looking and what object im actually trying to find. Can't see andromeda or orion nebula naked eye. Can't see milky way either. (When they are well above the horizon)
i'm limited to mostly stars pleiades. andromeda galaxy. and orion nebula.
triangulum is invisible at any magnification ive tried.
Even using my star tracker and aligning it to some stars. I still struggle to find things. and can't see anyDSO fainter than andromeda pleiades or orion nebula. Planets are fairly easy to spot though.
The faintest star I could see naked eye is about magnitude 4 to 4.5-ish so it's no wonder I can't see andromeda naked eye. pleiades looks about as faint as a magnitude 3 to 3.5-ish object to me. if I were to compare the apparent brightness to another star.
heres a 30-second exposure at F5.6 at 55mm focal length on a canon 500D of orions belt moon not up.
Orion nebula is hardly even visible. and the core is blown out to boot. from the excessive light pollution
naked eye its somewhere between a
i'm limited to mostly stars pleiades. andromeda galaxy. and orion nebula.
triangulum is invisible at any magnification ive tried.
Even using my star tracker and aligning it to some stars. I still struggle to find things. and can't see any
The faintest star I could see naked eye is about magnitude 4 to 4.5-ish so it's no wonder I can't see andromeda naked eye. pleiades looks about as faint as a magnitude 3 to 3.5-ish object to me. if I were to compare the apparent brightness to another star.
heres a 30-second exposure at F5.6 at 55mm focal length on a canon 500D of orions belt moon not up.
Orion nebula is hardly even visible. and the core is blown out to boot. from the excessive light pollution
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Canon EOS 100D/SL1
Tamron 18-200mm F3.5-F6.3 II VC lens
canon 50mm STM F1.8
svbony 8-24mm zoom eyepiece
svbony goldline 66 degree 9mm and 6mm + 40mm plossl + 2x barlow.
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- John Baars
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Re: Jupiter looks soft/fuzzy at 133x in 4" parabolic reflector?
I have read your remarks about your telescope.
- Bare in mind that it is a superfast F4 system. Only the most expensive eyepieces are capable of handling such a lightcone. The "kit-eyepieces" certainly won't. The sweet spot of sharpness is only several arcminutes wide. (4 Jupiters on a row or so) Beyondcoma starts. You call it warping.
- The mirror may not be a truly parabolic one. Although parabolising costs only minutes on a mirror that size, being a mass-product it may not have been done properly. Chances are that is still more spherical-like than a parabolic-one. It adds to the fuzziness.
- The ripply-water effect on very bright objects may have to do with the accuracy of the surface as a whole. Sounds like 1/2 wave peak to valley , where it should be at least 1/4. Being a typical wide-field instrument the manufacturer doesn't put more effort in it since it is not designed to function on the highest magnification levels. Adds to the fuzziness.
- Mass-product are more often not well polished. Mechanically polished in stead of done by hand on a pitch-bottom. Result is micro-ripple, visible as static stains on a defocused star. In focus: pixellated/ blocky. This also adds to the fuzziness on Jupiter.
Venus is a harsh object to evaluate you telescope on. And so is Jupiter. Take this all and add some severe seeing. It will become even worse. Don't take it too hard on the telescope. It works well at low power widefieldviews of the Milky Way, what is was made for and it will even give reasonable views of the Moon at low magnification.
- Bare in mind that it is a superfast F4 system. Only the most expensive eyepieces are capable of handling such a lightcone. The "kit-eyepieces" certainly won't. The sweet spot of sharpness is only several arcminutes wide. (4 Jupiters on a row or so) Beyond
- The mirror may not be a truly parabolic one. Although parabolising costs only minutes on a mirror that size, being a mass-product it may not have been done properly. Chances are that is still more spherical-like than a parabolic-one. It adds to the fuzziness.
- The ripply-water effect on very bright objects may have to do with the accuracy of the surface as a whole. Sounds like 1/2 wave peak to valley , where it should be at least 1/4. Being a typical wide-field instrument the manufacturer doesn't put more effort in it since it is not designed to function on the highest magnification levels. Adds to the fuzziness.
- Mass-product are more often not well polished. Mechanically polished in stead of done by hand on a pitch-bottom. Result is micro-ripple, visible as static stains on a defocused star. In focus: pixellated/ blocky. This also adds to the fuzziness on Jupiter.
Venus is a harsh object to evaluate you telescope on. And so is Jupiter. Take this all and add some severe seeing. It will become even worse. Don't take it too hard on the telescope. It works well at low power widefieldviews of the Milky Way, what is was made for and it will even give reasonable views of the Moon at low magnification.
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.
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Rijswijk Public Observatory: * Astro-Physics Starfire 130 f/8, * 6 inch Newton, * C9.25, * Meade 14 inch LX600 ACF, *Lunt.
Amateur astronomer since 1970.
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.
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Re: Jupiter looks soft/fuzzy at 133x in 4" parabolic reflector?
You live under bortle 9 skies like me. Your situation is best suited with a maksutov or refractor telescope at f8 or better. Such a telescope is way better on what is best available to you (moon/planets) than a f4 reflector. I am very very happy with the moon, planets, and brighter stars/doubles using my f8 refractor. If you decide make sure the scope is shipped by Walmart, not a vendor selling at the Walmart website. Right click the image.
https://www.walmart.com/ip/Celestron-As ... e/17355891
https://www.walmart.com/ip/Celestron-Ex ... /862501170
https://www.telescope.com/Orion/Orion-S ... eAscending
https://www.walmart.com/ip/Celestron-As ... e/17355891
https://www.walmart.com/ip/Celestron-Ex ... /862501170
https://www.telescope.com/Orion/Orion-S ... eAscending
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Re: Jupiter looks soft/fuzzy at 133x in 4" parabolic reflector?
realflow100:
I apologize if my reply to your problems seem a bit frank/forthrightly.
I apologize if my reply to your problems seem a bit frank/forthrightly.
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