90mm Doublets?
- pakarinen
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90mm Doublets?
Man... That's some icky-tasting stuff!
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- Lady Fraktor
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Re: 90mm Doublets?
The brain needs about 20 mm
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- Bigzmey Online
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Re: 90mm Doublets?
Would you buy 90ED though if you have 102ED?
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: 90mm Doublets?
The only doublet apochromat I'm aware of is this one:
https://www.sciencecenter.net/hutech/pr ... age/10.htm
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- Lady Fraktor
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Re: 90mm Doublets?
If it was something unique I may, if just a regular refractor off the shelf most likely not.
A bit like my current 100 mm
Remember a supposed ED is just a slightly better corrected achromat
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- Lady Fraktor
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Re: 90mm Doublets?
They should just call that a camera lensNakedgun wrote: ↑Tue Mar 21, 2023 3:46 am The only doublet apochromat I'm aware of is this one:
https://www.sciencecenter.net/hutech/pr ... age/10.htm
Though with a Panoptic 41 mm it would give just under a 5°
If you keep a eye on the Stellarvue site a pre-owned 90 mm Raptor will occasionally appear for sale. Wonderful telescopes
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Re: 90mm Doublets?
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
- Lady Fraktor
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Re: 90mm Doublets?
The
From memory most 90 mm refractors tend to be longer focal lengths as well, Synta and Meade both produced some very nice achromats in the past.
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Re: 90mm Doublets?
For me getting 80mm was purpose fit. My Onyx ED just barely fits carry-on pelican case. An inch longer and it would not be air travel friendly.
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: 90mm Doublets?
~Lady Fraktor wrote: ↑Tue Mar 21, 2023 4:38 amThey should just call that a camera lensNakedgun wrote: ↑Tue Mar 21, 2023 3:46 am The only doublet apochromat I'm aware of is this one:
https://www.sciencecenter.net/hutech/pr ... age/10.htm
Visual only, for me.
:
:
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- Lady Fraktor
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Re: 90mm Doublets?
The best way, insert eyepiece and view. None of that voodoo the
I have never seen a Borg refractor here before, how are they for views/ build quality?
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- pakarinen
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Re: 90mm Doublets?
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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