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Thread: eyepiece choice by curvature of field

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    Default eyepiece choice by curvature of field



    OKI'm not just looking for an excuse to buy more eps....

    But it is often said by folks who are expert that the choice of the field curvature characteristics of an eyepiece can counterbalance the field curvature characteristics of the objective.

    So what eyepiece types have field curvature characteristics that are good against:

    short rich field achromats
    short apochromats
    long achromats
    short Newtonians
    Schmidt Cassegrain vanilla
    Schmidt Cassegrain aplanats (Edge, Meade ACF)
    Maksutov Cassegrains
    Maksutov Newtonians

    I'm trying to avoid thinking about this but my guess is that anything longish is just peachy with Orthoscopics, Konigs and Erfles. Of course the long scopes will have less intrinsic field curvature usually....

    What do you think?
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    Default Re: eyepiece choice by curvature of field

    this could be a useful consideration for older folks whose less elastic eye-lenses cannot accommodate field curvature as well as when younger.
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    Default Re: eyepiece choice by curvature of field

    Very interesting nFA, I have not really thought of this and will have to give it some thought as I know how the Orthos and Astroplanokular styles compliment the mid to longer focal length scopes....
    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"
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    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
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    / 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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