Achromatic and apochromatic doublets
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Achromatic and apochromatic doublets
are all apochromatic doublets made out of ED glass and do they have the same design as achromatic ones?
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Re: Achromatic and apochromatic doublets
Mechanical and optical design is very similar. The only difference is that in APO doublet one of the two glass elements in the objective is replaced with ED glass.
Scopes: Stellarvue: SV102ED; Celestron: 9.25" EdgeHD, 8" SCT, 150ST, Onyx 80ED; iOptron: Hankmeister 6" Mak; SW: 7" Mak; Meade: 80ST.
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, 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: 3106 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 2180, S110: 77). Doubles: 2437, Comets: 34, Asteroids: 257
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, 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: 3106 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 2180, S110: 77). Doubles: 2437, Comets: 34, Asteroids: 257
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Re: Achromatic and apochromatic doublets
The general layout of the elements will be the same if comparing a Fraunhofer achro to a Fraunhofer apo or Steiheil apo to a Steinheil achro but you could not take the extra low dispersion element from one and put it in the other.
Each element has two specific curves needed for its focal length to make it mate to the other element(s)
You could likely replace a element from a mass produced achromat to another similar achromat orapo to apo but not achro to apo , the different curves would not match up.
Each element has two specific curves needed for its focal length to make it mate to the other element(s)
You could likely replace a element from a mass produced achromat to another similar achromat or
Gabrielle
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
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Eyepieces: Antares to Zeiss (1011110)
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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
Eyepieces: Antares to Zeiss (1011110)
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Re: Achromatic and apochromatic doublets
To your first question, any ED doublet will have one element made of extra low dispersion glass, Lanthanum is a common mating lens.
Each glass type (FPL-53, OK-4, FPL-55, etc) will have a designed curve to mate with the extra element.
Focal length design, style of design (Fraunhofer, Baker, etc) and precision of figuring/ polishing will also dictate needed curves.
Is there something specific you are looking for?
Each glass type (FPL-53, OK-4, FPL-55, etc) will have a designed curve to mate with the extra element.
Focal length design, style of design (Fraunhofer, Baker, etc) and precision of figuring/ polishing will also dictate needed curves.
Is there something specific you are looking for?
Gabrielle
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
Eyepieces: Antares to Zeiss (1011110)
The only culture I have is from yogurt
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
Eyepieces: Antares to Zeiss (1011110)
The only culture I have is from yogurt
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Re: Achromatic and apochromatic doublets
Why do the Skywatcher ED doublets cost more than some Explore Scientific triplets? The least expensive triplet should cost more than an ED doublet of the same aperture , but that is not always the case. I love my 150mm f/ 8 achromatic. For very distant objects like galaxies I use full aperture . For closer brighter objects I use a 100mm or 90mm aperture mask. However, a 150mm Ed doublet would be nice to own. What would you say is the best 150mm ED doublet under $3000? The first question is more important to me. Left click the images. Thanks all
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Re: Achromatic and apochromatic doublets
It's not a simple matter of counting optical surfaces. Figuring, polishing and testing cost time and money. Not all companies make the same effort for each optical surface.
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: Achromatic and apochromatic doublets
From what I was told, here it would be a case of pure marketing, the 120 ed that sells very very well.Refractordude wrote: ↑Mon Feb 08, 2021 11:38 pm Why do the Skywatcher ED doublets cost more than some Explore Scientific triplets? The least expensive triplet should cost more than an ED doublet of the same aperture, but that is not always the case. I love my 150mm f/8 achromatic. For very distant objects like galaxies I use full aperture. For closer brighter objects I use a 100mm or 90mm aperture mask. However, a 150mm Ed doublet would be nice to own. What would you say is the best 150mm ED doublet under $3000? The first question is more important to me. Left click the images. Thanks all
I spoke to two dealers, one told me that the glass used by
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Re: Achromatic and apochromatic doublets
When I was looking for my firstRefractordude wrote: ↑Mon Feb 08, 2021 11:38 pm Why do the Skywatcher ED doublets cost more than some Explore Scientific triplets? The least expensive triplet should cost more than an ED doublet of the same aperture, but that is not always the case. I love my 150mm f/8 achromatic. For very distant objects like galaxies I use full aperture. For closer brighter objects I use a 100mm or 90mm aperture mask. However, a 150mm Ed doublet would be nice to own. What would you say is the best 150mm ED doublet under $3000? The first question is more important to me. Left click the images. Thanks all
Now, from what I hear
For the second part of the question, I have considered 6"
Scopes: Stellarvue: SV102ED; Celestron: 9.25" EdgeHD, 8" SCT, 150ST, Onyx 80ED; iOptron: Hankmeister 6" Mak; SW: 7" Mak; Meade: 80ST.
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, 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: 3106 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 2180, S110: 77). Doubles: 2437, Comets: 34, Asteroids: 257
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, 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: 3106 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 2180, S110: 77). Doubles: 2437, Comets: 34, Asteroids: 257
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Re: Achromatic and apochromatic doublets
I can't speak to the SkyWatcher models but I have the E.S. ED127mm model you posted above and I've been extremely happy with it. Both visually and imaging with the E.S. 3" 0.7x reducer/flattener.
All of the images I've posted here were taken with that setup.
All of the images I've posted here were taken with that setup.
Greg M.~ "Ad Astra per Aspera"
Scopes: Celestron EdgeHD14", Explore Scientific ED152CF & ED127 APO's, StellarVue SV70T, Classic Orange-Tube C-8, Lunt 80mm Ha double-stack solar scope.
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Filters: 36mm Chroma LRGB & 3nm Ha, OIII, SII, L-Pro, L-eXtreme
Eyepieces: 27mm TeleVue Panoptic, 4mm TeleVue Radian, Explore Scientific 82° 30mm, 6.7mm , Baader 13mm Hyperion, Explore Scientific 70° 10mm, 15mm, 20mm, Meade 8.8mm UWA
Software: N.I.N.A., SharpCapPro, PixInsight, PhotoShop CC, Phd2, Stellarium
https://www.nevadadesertskies.com
Scopes: Celestron EdgeHD14", Explore Scientific ED152CF & ED127 APO's, StellarVue SV70T, Classic Orange-Tube C-8, Lunt 80mm Ha double-stack solar scope.
Mounts: Astro-Physics Mach One, iOptron CEM70EC Mount, iOptron ZEQ25 Mount.
Cameras: ZWO ASI2600mm Pro, ZWO 2600MC Pro, ZWO ASI1600mm
Filters: 36mm Chroma LRGB & 3nm Ha, OIII, SII, L-Pro, L-eXtreme
Eyepieces: 27mm TeleVue Panoptic, 4mm TeleVue Radian, Explore Scientific 82° 30mm, 6.7mm , Baader 13mm Hyperion, Explore Scientific 70° 10mm, 15mm, 20mm, Meade 8.8mm UWA
Software: N.I.N.A., SharpCapPro, PixInsight, PhotoShop CC, Phd2, Stellarium
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Re: Achromatic and apochromatic doublets
Any violet color at high mag?AstroBee wrote: ↑Tue Feb 09, 2021 4:08 am I can't speak to the SkyWatcher models but I have the E.S. ED127mm model you posted above and I've been extremely happy with it. Both visually and imaging with the E.S. 3" 0.7x reducer/flattener.
All of the images I've posted here were taken with that setup.
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Re: Achromatic and apochromatic doublets
None that I've ever noticed. And I also have their 152mm doublet. The purple fringing is very apparent through it.Refractordude wrote: ↑Tue Feb 09, 2021 4:56 amAny violet color at high mag?AstroBee wrote: ↑Tue Feb 09, 2021 4:08 am I can't speak to the SkyWatcher models but I have the E.S. ED127mm model you posted above and I've been extremely happy with it. Both visually and imaging with the E.S. 3" 0.7x reducer/flattener.
All of the images I've posted here were taken with that setup.
Greg M.~ "Ad Astra per Aspera"
Scopes: Celestron EdgeHD14", Explore Scientific ED152CF & ED127 APO's, StellarVue SV70T, Classic Orange-Tube C-8, Lunt 80mm Ha double-stack solar scope.
Mounts: Astro-Physics Mach One, iOptron CEM70EC Mount, iOptron ZEQ25 Mount.
Cameras: ZWO ASI2600mm Pro, ZWO 2600MC Pro, ZWO ASI1600mm
Filters: 36mm Chroma LRGB & 3nm Ha, OIII, SII, L-Pro, L-eXtreme
Eyepieces: 27mm TeleVue Panoptic, 4mm TeleVue Radian, Explore Scientific 82° 30mm, 6.7mm , Baader 13mm Hyperion, Explore Scientific 70° 10mm, 15mm, 20mm, Meade 8.8mm UWA
Software: N.I.N.A., SharpCapPro, PixInsight, PhotoShop CC, Phd2, Stellarium
https://www.nevadadesertskies.com
Scopes: Celestron EdgeHD14", Explore Scientific ED152CF & ED127 APO's, StellarVue SV70T, Classic Orange-Tube C-8, Lunt 80mm Ha double-stack solar scope.
Mounts: Astro-Physics Mach One, iOptron CEM70EC Mount, iOptron ZEQ25 Mount.
Cameras: ZWO ASI2600mm Pro, ZWO 2600MC Pro, ZWO ASI1600mm
Filters: 36mm Chroma LRGB & 3nm Ha, OIII, SII, L-Pro, L-eXtreme
Eyepieces: 27mm TeleVue Panoptic, 4mm TeleVue Radian, Explore Scientific 82° 30mm, 6.7mm , Baader 13mm Hyperion, Explore Scientific 70° 10mm, 15mm, 20mm, Meade 8.8mm UWA
Software: N.I.N.A., SharpCapPro, PixInsight, PhotoShop CC, Phd2, Stellarium
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Re: Achromatic and apochromatic doublets
Is lanthanum really worth the extra cost or is it just marketing? I'd Google, but I'm lazy.
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Re: Achromatic and apochromatic doublets
Totally worth it.
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: Achromatic and apochromatic doublets
Let me back off my "totally worth it" to the extent of adding a "within reason". What are you thinking of getting?
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: Achromatic and apochromatic doublets
As far as I can see it is a mixed bag, Explore triplets have a good reputation, but they don’t use FPL53 (rather going for Hoya FCD001 ED). As said elsewhere, the matching and machine work, air spacing etc. all affect the performance. Waving FPL53, triplet etc. are marketing ways of selling by specification. At the end of the day, we are being sold to.
Forums tend to be full of people saying, you must have a; XYZ; ABC; or DEF for this or that. Read reviews, in a wide variety, watch videos, and at the end of the day make your choice for your work.
As a salesman I can honestly tell you that specifications are a marketing ploy, often the more glorified the specification the more hyped the product. I work for a top end spectrometer company, our competitors carefully tune their specifications to beat ours on paper. How do we combat this? Happily invite them to do a side-by-side comparison- that is reality.
Want to compare telescopes - find a way to look through them...
Forums tend to be full of people saying, you must have a; XYZ; ABC; or DEF for this or that. Read reviews, in a wide variety, watch videos, and at the end of the day make your choice for your work.
As a salesman I can honestly tell you that specifications are a marketing ploy, often the more glorified the specification the more hyped the product. I work for a top end spectrometer company, our competitors carefully tune their specifications to beat ours on paper. How do we combat this? Happily invite them to do a side-by-side comparison- that is reality.
Want to compare telescopes - find a way to look through them...
Cheers,
Tony.
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Tony.
Smart Scope: Dwarf II - Club and outreach work.
AP Refractor: Altair 72EDF Deluxe F6;1x & 0.8 Flatteners; Antares Versascope 60mm finder. ASIAir Pro.Li battery pack for grab & go.
Celestron AVX Mount; X-cel LX eyepieces & Barlows 2x 3x, ZWO 2” Filter holder,
Cameras: main DSO ASI533MC; DSO guide ASI120MM; Planetary ASI224MC; DSLR Canon EOS100 stock.
Filters: Astronomik IR cut; Optolong L-Pro; Optolong L-Enhance.
Binoculars: Celestron 15 x 70.
Latitude: 52.219853
Longitude: -1.034471
Accuracy: 5 m
Bortle 4 site. https://maps.google.com/?q=52.21985,-1.03447
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Re: Achromatic and apochromatic doublets
80mm F7 EDL. I'd sell my ST80 and ST120 to help finance it. Or not.notFritzArgelander wrote: ↑Fri Jun 04, 2021 4:48 pmLet me back off my "totally worth it" to the extent of adding a "within reason". What are you thinking of getting?
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I drink tea, I read books, I look at stars when I'm not cursing clouds. It's what I do.
=============================================================================
AT50, AT72EDII, ST80, ST102; Scopetech Zero, AZ-GTi, AZ Pronto; Innorel RT90C, Oberwerk 5000; Orion Giantview 15x70s, Vortex 8x42s, Navy surplus 7x50s, Nikon 10x50s
I drink tea, I read books, I look at stars when I'm not cursing clouds. It's what I do.
=============================================================================
AT50, AT72EDII, ST80, ST102; Scopetech Zero, AZ-GTi, AZ Pronto; Innorel RT90C, Oberwerk 5000; Orion Giantview 15x70s, Vortex 8x42s, Navy surplus 7x50s, Nikon 10x50s
- Lady Fraktor
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Re: Achromatic and apochromatic doublets
Do you have a link to share?
Gabrielle
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
Eyepieces: Antares to Zeiss (1011110)
The only culture I have is from yogurt
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
Eyepieces: Antares to Zeiss (1011110)
The only culture I have is from yogurt
- notFritzArgelander
- In Memory
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Re: Achromatic and apochromatic doublets
If you mean this one?
https://www.teleskop-express.de/shop/pr ... ektiv.html
Then totally worth it. I paid $600 for theSV ED80 Access which is ED + lanthanum and I am very, very happy with it. I think the OEM is the same. The SV had a higher price because of additional QC.
https://www.teleskop-express.de/shop/pr ... ektiv.html
Then totally worth it. I paid $600 for the
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
- BFaucett
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Re: Achromatic and apochromatic doublets
from Astronomics
ASTRO-TECH AT80EDL REFRACTOR
https://www.astronomics.com/astro-tech- ... -3515.html
Cheers! Bob F.
_____________________________________________________
I'm a backyard stargazer. Houston Astronomical Society (link)
scopes: Astro-Tech: AT60ED, AT70ED, AT72EDII ● Celestron: 80ED, Omni XLT AZ 102, C90 Mak ● S-W: Skymax 102 Mak
eyepieces: ES82 4.7, 6.7, 8.8, 11, 14 ● Astro-Tech UWA 4, 7, 10, 13, 16 ● ES68 20, 24 ● ES62 5.5, 9, 20 ● ES52 4.5, 30 ● APM UFF 30
Meade 5000 UWA 82° 5.5, 8.8, 14 ● StarGuider Dual ED 60° 3.2, 5, 8, 12, 15, 18, 25 ● Astro-Tech PFF 60/65° 5.5, 10.5, 15.5, 19, 25
I'm a backyard stargazer. Houston Astronomical Society (link)
scopes: Astro-Tech: AT60ED, AT70ED, AT72EDII ● Celestron: 80ED, Omni XLT AZ 102, C90 Mak ● S-W: Skymax 102 Mak
eyepieces: ES82 4.7, 6.7, 8.8, 11, 14 ● Astro-Tech UWA 4, 7, 10, 13, 16 ● ES68 20, 24 ● ES62 5.5, 9, 20 ● ES52 4.5, 30 ● APM UFF 30
Meade 5000 UWA 82° 5.5, 8.8, 14 ● StarGuider Dual ED 60° 3.2, 5, 8, 12, 15, 18, 25 ● Astro-Tech PFF 60/65° 5.5, 10.5, 15.5, 19, 25
- notFritzArgelander
- In Memory
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Re: Achromatic and apochromatic doublets
Yes, that would work too.BFaucett wrote: ↑Fri Jun 04, 2021 7:55 pm
from Astronomics
ASTRO-TECH AT80EDL REFRACTOROTA FCD-100 AND LANTHANUMF/ 7 DOUBLET
https://www.astronomics.com/astro-tech- ... -3515.html
Cheers! Bob F.
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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