Parfocal surprises

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The Happy Parrot
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Parfocal surprises

#1

Post by The Happy Parrot »


No idea how common this is, but I was pleasantly surprised to discover my budget 12mm Agena StarGuider eyepiece is parfocal with my fancy 5mm Meade MWA 100 degree ep. Are there other such happy coincidences?

I mention this because I recently bought a 14mm/82 degree Meade and was thinking of selling the 12mm StarGuider, only to learn the Meades are not parfocal. They are from a different era and OEM manufacturer, but I somehow hoped they would match.
Parfocal eyepieces.
Parfocal eyepieces.
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Graeme1858 Great Britain
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Re: Parfocal surprises

#2

Post by Graeme1858 »


The Happy Parrot wrote: Sun Jun 06, 2021 1:22 am No idea how common this is, but I was pleasantly surprised to discover my budget 12mm Agena StarGuider eyepiece is parfocal with my fancy 5mm Meade MWA 100 degree ep. Are there other such happy coincidences?

Nothing better than a pleasant surprise!
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Bigzmey United States of America
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Re: Parfocal surprises

#3

Post by Bigzmey »


It has happened to me to. Some of my Orthos and Plossls are parfocal to wide fields.
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.

Observing: DSOs: 3106 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 2180, S110: 77). Doubles: 2382, Comets: 34, Asteroids: 255
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Ruud
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Re: Parfocal surprises

#4

Post by Ruud »


I never had such luck!
7x50 Helios Apollo 8x42 Bresser Everest 73mm f/5.9 WO APO 4" f/5 TeleVue Genesis 6" f/10 Celestron 6SE 0.63x reducer 1.8, 2, 2.5 and 3x Barlows eyepieces from 4.5 to 34mm
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