Achromatic and apochromatic doublets
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Achromatic and apochromatic doublets
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Re: Achromatic and apochromatic doublets
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: 3106 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 2180, S110: 77). Doubles: 2461, Comets: 34, Asteroids: 261
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Re: Achromatic and apochromatic doublets
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
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 (1000101)
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Re: Achromatic and apochromatic doublets
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?
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 (1000101)
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Re: Achromatic and apochromatic doublets
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Re: Achromatic and apochromatic doublets
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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
REFRACTOR , TS-Optics Doublet SD-APO 125 mm f/7.8 . Lunt 80mm MT Ha Doublet Refractor .
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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"
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: 3106 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 2180, S110: 77). Doubles: 2461, Comets: 34, Asteroids: 261
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Re: Achromatic and apochromatic doublets
All of the images I've posted here were taken with that setup.
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.
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
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Re: Achromatic and apochromatic doublets
Man... That's some icky-tasting stuff!
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Re: Achromatic and apochromatic doublets
Totally worth it.
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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?
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Re: Achromatic and apochromatic doublets
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...
Tony.
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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?
Man... That's some icky-tasting stuff!
=============================================================================
AT50, AT72EDII, ST80, ST102; Scopetech Zero, AZ-GTi, AZ Pronto; Innorel RT90C, Oberwerk 5000; Orion Giantview 15x70s, Vortex 8x42s, Navy surplus 7x50s, Nikon 10x50s
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Re: Achromatic and apochromatic doublets
Do you have a link to share?
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 (1000101)
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- notFritzArgelander
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Re: Achromatic and apochromatic doublets
https://www.teleskop-express.de/shop/pr ... ektiv.html
Then totally worth it. I paid $600 for the
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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
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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.
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