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Thread: Are there zoom eyepieces more like 20mm to 40mm?

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    Default Are there zoom eyepieces more like 20mm to 40mm?



    Hello All,

    I see that most 1.25 zoom eyepieces are 8 to 24mm or shorter focal length. Do they make 1.25 zoom eyepieces with focal lengths like 20 to 40mm?

    Would a spotting scope eyepiece such as this work with my Orion 102 Mak?
    https://www.bhphotovideo.com/c/produ..._regal_m2.html

    Harry
    Orion Apex 102mm Mak, Celestron 6x30 finder, Orion 90* prism diagonal, 45* erecting prism diagonal, Celestron straight through porro prism, Tele Vue 1.8x Barlow, 25mm 52* Super Plossl eyepiece, SVBONY 23mm 62* Aspheric eyepiece, 8.5mm Konig eyepiece

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    Default Re: Are there zoom eyepieces more like 20mm to 40mm?

    Looking through the Q&A section on the website they say it has a 1.25" barrel so no need for an adapter and it has be used in at least a 90mm Mak.
    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
    Mounts: Celestron SLT w/ pier mod & EQ-3 tripod, Celestron hypertuned CG-5 w/ tracking motor & Argo Navis, Manfrotto 028B w/ Stellarvue M2C, Manfrotto 055PRO w/ 128RC, TAL-1 HD EQ, Vixen SXP w/ HAL-130 SXG & half pier
    Diagonals: 2" Astro-Physics MaxBright, 2" Zeiss/ Baader prism, 2" Baader Herschel Wedge (Photo Version), 2" Orion Amici prism, 2" Stellarvue Dielectric, 2" TeleVue Everbrite
    Eyepieces: A-Z

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    The weakest link in the optical chain is the large nut located directly behind the eyepiece/ camera. - Gabrielle
    Ya gotta keep this Apo/
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    thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)

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    Default Re: Are there zoom eyepieces more like 20mm to 40mm?

    Thank you Gabby,

    I didn't think to look in Q&A. From there I started looking for other information on the eyepiece. From what I could find, it seems that the Celestron spotting scope zoom eyepiece is a standard 8 to 24mm zoom.

    I looked through a fair amount of zoom eyepiece information and couldn't find any longer focal length zoom eyepieces. I could see where there might be less demand for a long focal length zoom, but there should be enough demand. Maybe there is a manufacturing problem or FOV problem.

    If anyone knows of long focal length 1.25 zoom eyepieces, please let me know.

    Harry
    Orion Apex 102mm Mak, Celestron 6x30 finder, Orion 90* prism diagonal, 45* erecting prism diagonal, Celestron straight through porro prism, Tele Vue 1.8x Barlow, 25mm 52* Super Plossl eyepiece, SVBONY 23mm 62* Aspheric eyepiece, 8.5mm Konig eyepiece

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    Default Re: Are there zoom eyepieces more like 20mm to 40mm?

    The 8-24mm is pretty much the standard, the only exceptions are the shorter focal length TeleVue and Speer-Waler.
    In longer focal lengths as a zoom I imagine it would be difficult to manage the focal length, magnification and eyepiece aberrations properly to get a decent FOV.
    harryhh likes this.
    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
    Mounts: Celestron SLT w/ pier mod & EQ-3 tripod, Celestron hypertuned CG-5 w/ tracking motor & Argo Navis, Manfrotto 028B w/ Stellarvue M2C, Manfrotto 055PRO w/ 128RC, TAL-1 HD EQ, Vixen SXP w/ HAL-130 SXG & half pier
    Diagonals: 2" Astro-Physics MaxBright, 2" Zeiss/ Baader prism, 2" Baader Herschel Wedge (Photo Version), 2" Orion Amici prism, 2" Stellarvue Dielectric, 2" TeleVue Everbrite
    Eyepieces: A-Z

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    The weakest link in the optical chain is the large nut located directly behind the eyepiece/ camera. - Gabrielle
    Ya gotta keep this Apo/
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)

    Refractors kick arse precisely because they don't hide behind excuses. That is, they have no obstructions to hide behind. - Jon Isaacs (CN)

 

 

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