Should A Refractor Be Called A Reflector?
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Should A Refractor Be Called A Reflector?
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Re: Should A Refractor Be Called A Reflector?
JT
∞ AP Scopes: #1: TPO 6" f/9 RC #2: ES 102 f/7 APO #3: ES 80mm f/6 APO
∞ G&G Scopes: #1: Meade 102mm f/7.8 #2: Bresser 102mm f/4.5
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Searching the skies since 1966. "I never met a scope I didn't want to keep."
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Re: Should A Refractor Be Called A Reflector?
But why would you want to do either of those things? The terms refractor and reflector make a practical and useful distinction between the two types of scopes on the basis of their optical properties and construction. So I'd say let's leave our terminology as it is!
Mounts: Vixen SXW/Starbook (original); Stellarvue M2C alt-az.
Eyepieces: Televue: 55mm Plossl, 22mm Panoptic, 17.3mm Delos, 13mm Nagler, c. 1980, 11mm Plossl, 7mm Nagler, 5mm Radian; Meade 15mm Super Plossl; VERNONSCOPE 2.4X BARLOW
Binoculars: Leica 8x32 Trinovids, circa 1997; Orion Megaview 20x80, Orion Paragon Plus mount.
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Re: Should A Refractor Be Called A Reflector?
* Celestron C6 SCT on a Twilight 1 Alt-Az mount
Prof. Barnhardt to Klaatu in The Day the Earth Stood Still: "There are several thousand questions I'd like to ask you.”
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Re: Should A Refractor Be Called A Reflector?
Man... That's some icky-tasting stuff!
=============================================================================
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Re: Should A Refractor Be Called A Reflector?
JT
∞ AP Scopes: #1: TPO 6" f/9 RC #2: ES 102 f/7 APO #3: ES 80mm f/6 APO
∞ G&G Scopes: #1: Meade 102mm f/7.8 #2: Bresser 102mm f/4.5
∞ Guide Scopes: 70 & 80mm fracs -- The El Cheapo Bros.
∞ Mounts: iOptron CEM70AG, SW EQ6R, Celestron AVX, SLT & GT (Alt-Az), Meade DS2000
∞ Cameras: #1: ZWO ASI294MC Pro #2: 662MC #3: 120MC, Canon T3i, Orion SSAG, WYZE Cam3
∞ Binos: 10X50,11X70,15X70, 25X100 ∞ AP Gear: ZWO EAF and mini EFW and the Optolong L-eXteme filter
∞ EPs: ES 2": 21mm 100° & 30mm 82° Pentax XW: 7, 10, 14, & 20mm 70°
Searching the skies since 1966. "I never met a scope I didn't want to keep."
- notFritzArgelander
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Re: Should A Refractor Be Called A Reflector?
Refractors are dioptrics.AntennaGuy wrote: ↑Mon Nov 11, 2019 9:04 pm I agree with JT. Although the optical quality of a diagonal is important, its primary role is simply to re-direct the beam. The image forming mechanisms are either lenses or mirrors. Since eyepieces are normally made from lenses, that leaves the main objective (lens = refractor, or mirror = reflector) as the determinant of whether a telescope is a reflector or refractor (otherwise we'd have to call nearly all telescopes refractors). There are some potentially confusing mixtures (e.g., Schmidt-Cassegrain, Maksutov, etc.). But those are normally still considered to be reflectors, while their aperture-sized lens-type elements are considered to be "correctors."
Newtonians, classical Cassegrains and all mirror systems are catoptrics.
Maksutovs, SCTs that mix lenses and mirrors are catadioptrics.
The use of a diagonal is a nonessential option.
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Re: Should A Refractor Be Called A Reflector?
I am wrong and great answer nFAnotFritzArgelander wrote: ↑Mon Nov 11, 2019 9:41 pmRefractors are dioptrics.AntennaGuy wrote: ↑Mon Nov 11, 2019 9:04 pm I agree with JT. Although the optical quality of a diagonal is important, its primary role is simply to re-direct the beam. The image forming mechanisms are either lenses or mirrors. Since eyepieces are normally made from lenses, that leaves the main objective (lens = refractor, or mirror = reflector) as the determinant of whether a telescope is a reflector or refractor (otherwise we'd have to call nearly all telescopes refractors). There are some potentially confusing mixtures (e.g., Schmidt-Cassegrain, Maksutov, etc.). But those are normally still considered to be reflectors, while their aperture-sized lens-type elements are considered to be "correctors."
Newtonians, classical Cassegrains and all mirror systems are catoptrics.
Maksutovs, SCTs that mix lenses and mirrors are catadioptrics.
The use of a diagonal is a nonessential option.
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Re: Should A Refractor Be Called A Reflector?
Mounts: SW: SkyTee2, AzGTi; iOptron: AZMP; ES: Twilight I; Bresser: EXOS2; UA: MicroStar.
Binos: APM: 100-90 APO; Canon: IS 15x50; Orion: Binoviewer, LG II 15x70, WV 10x50, Nikon: AE 16x50, 10x50, 8x40.
EPs: Pentax: XWs & XFs; TeleVue: Delites, Delos, Panoptic & Plossls; ES: 68, 62; Vixen: SLVs; Baader: BCOs, Aspherics, Mark IV.
Diagonals: Baader: BBHS mirror, Zeiss Spec T2 prism, Clicklock dielectric; TeleVue: Evebrite dielectric; AltairAstro: 2" prism.
Filters: Lumicon: DeepSky, UHC, OIII, H-beta; Baader: Moon & SkyGlow, Contrast Booster, UHC-S, 6-color set; Astronomik: UHC.
Solar: HA: Lunt 50mm single stack, W/L: Meade Herschel wedge.
Observing: DSOs: 3122 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 2196, S110: 77). Doubles: 2461, Comets: 34, Asteroids: 261
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Re: Should A Refractor Be Called A Reflector?
because both the light gathering optics and the eyepiece are dioptrics, and there is a zenith diagonal in between.
The other one, listed by not_Fritz, would be catadioptric-diagonal-dioptrix, ...
Regarding the old German Schiefspiegler, I have nothing better than calling it Schiefspieglerteutonics.
The Fraunhofer tracking
ZEISS has decided to call their refracting spotting scope, Diascope.
Following ZEISS, Thomas Baader has renamed the astroplanar remake into Eudiascopic
It's Tuesday noon here, time for a cup of coffee and a cake, but not Leibnitzkeks, I tell you
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Leica 82mm APO Televid
Eyepieces: Docter UWA; Leica B WW and WW Asph. Zoom; Leica HC Plan S and L, monocentric; Pentax SMC XW, O-, XO; Tak MC O, Carl Zeiss B WW, and Pl, E-Pl, S-Pl, W-Pl;
Swarovski SW; Baader Symmetric Diascope Edition; Nikon NAV SW, ; TMB supermonocentric; Rodenstock; Vixen HR; TV Delos
Filters: Astrodon, Astronomik, Baader, Balzers, Zeiss West and East, Lumicon
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Re: Should A Refractor Be Called A Reflector?
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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Re: Should A Refractor Be Called A Reflector?
Here are some images from the web
cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7,asi 290 mm
mounts : eq6 pro/eq8/mesu 200 v2
filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, chroma 3nm ha,sii,oiii,nii,rgb,lowglow,uv/ir,Thousand Oaks Solar Filter,1.25'' #47 violet,pro planet 742 ir,pro planet 807 ir,pro planet 642 bp ir.
extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel,tele vue 2x barlow .
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Re: Should A Refractor Be Called A Reflector?
DSO AP: Orion 200mm f/4 Newtonian Astrograph; ATIK 383L+; EFW2 filter wheel; Astrodon Ha,Oiii,LRGB filters; KWIQ/QHY5 guide scope; Planetary AP: Celestron C-11; ZWO ASI120MC; Portable: Celestron C-8 on HEQ5 pro; C-90 on wedge; 20x80 binos; Etc: Canon 350D; Various EPs, etc. Obs: 8' Exploradome; iOptron CEM60 (pier); Helena Observatory (H2O) Astrobin
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Re: Should A Refractor Be Called A Reflector?
EP: 5.5mm, 8.8mm, 14mm, 20mm, 24mm Meade 5000 UWA's, BCO's w/ Q-Turret, 26mm, 32mm, 40mm Meade 4000 Plossls, Orion Expanse, 30mm, 20mm, 15mm GSO Superview, Various others.
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Re: Should A Refractor Be Called A Reflector?
Eps: 4mm Ramsden, 6mm Huygenian, 12.5mm Huygenian, 20mm Huygenian, 4mm Plossl, 10mm Plossl, 20mm Plossl, Barlow 2x, Barlow 3x, Barlow 5x, Solomark LP Filter, Dark Green Moon Filter.
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Re: Should A Refractor Be Called A Reflector?
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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Naked Eye: Two Eyeballs
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Re: Should A Refractor Be Called A Reflector?
Kathy,
and when it makes spikes around the stars,
then it is catadioptric asterix,
JG
Leica 82mm APO Televid
Eyepieces: Docter UWA; Leica B WW and WW Asph. Zoom; Leica HC Plan S and L, monocentric; Pentax SMC XW, O-, XO; Tak MC O, Carl Zeiss B WW, and Pl, E-Pl, S-Pl, W-Pl;
Swarovski SW; Baader Symmetric Diascope Edition; Nikon NAV SW, ; TMB supermonocentric; Rodenstock; Vixen HR; TV Delos
Filters: Astrodon, Astronomik, Baader, Balzers, Zeiss West and East, Lumicon
Binoculars (7x42 up to 15x85): Docter Nobilem, Leica Ultravid, Nikon Astroluxe, Swarovski EL Swarovision; BA8 (Kunming Optical)
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Re: Should A Refractor Be Called A Reflector?
Language is by usage, so if you overthink it, people might tease you for it, as shown in the posts above.
--Russmax
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Re: Should A Refractor Be Called A Reflector?
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