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Eyepieces

The specifications of a telescope are NOT the only specs that matter. The other half of the equation is the specifications of the eyepiece. Telescope eyepieces are made in different models and sizes to accommodate different observing methods and celestial objects. For example, understanding the focal length of your optical tube divided by the focal length of your eyepiece will result in magnification, which in return can tell you whether it is more suitable for deep space low surface brightness observation or planetary/terrestrial high surface brightness observation. For example, if you wanted to observe an object such as the Andromeda Galaxy with a large apparent diameter, an eyepiece with a long focal length and large apparent field of view would excel over an eyepiece with a shorter focal length and small apparent field of view because it would be able to accommodate the size of the object at low magnification and high FOV while not getting dimmer images as you would with short focal lengths. If you plan on observing planets, a short focal length eyepiece with a small FOV will result in high magnification to observe details on the surface (eg. Great Red Spot). You'll get a dimmer image, but since planets are already bright as it is, this won't be an issue. - Note: Almost all eyepieces come in 2" or 1.25" barrel size forms.

 


Telescope Focal Length

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  1. AstroSystems - Standard Eyepiece Adapter -- 2.0 " to 1.25 " with compression ring

    AstroSystems - Standard Eyepiece Adapter -- 2.0 " to 1.25 " with compression ring

    This precision-made adapter is made of anodized aluminum and threaded for 48mm (2 inch) filters. Our adapters now feature a compression ring. This offers accurate and consistent retention of collimation tools and is non-marring on eyepiece barrels ... Learn More
    Model#: AS_SEA
    $29.00

  2. AstroSystems - Ultra Low Eyepiece Adapter--2.0 " to 1.25 " with compression ring

    AstroSystems - Ultra Low Eyepiece Adapter--2.0 " to 1.25 " with compression ring

    You can lower the profile of your 1.25 inch eyepiece another 0.5 inch below the drawtube. The ultra low eyepiece adapter works with any 2.0 inch focuser. The 1.25 inch eyepiece position is inset down into the adapter, dropping the eyepiece height 0 ... Learn More
    Model#: AS_ULEA
    $29.00

  3. Baader Planetarium - Pushfix 2" / 1.25" Adapter for Newton Focuser

    Baader Planetarium - Pushfix 2" / 1.25" Adapter for Newton Focuser

    Baader's Pushfix Reducer is the perfect low-profile 2"/1¼ reducer for the Newtonian and SCT Steeltrack focusers. The 'pushfix' reducer incorporates unique features not found in any other reducer ... Learn More
    Model#: T2-15A
    $43.00

  4. FOC-RTAD

    Baader Planetarium - Steeltrack RT AdapterSet for Skywatcher / Celestron Refractors, with adapter threads for M68(Zeiss), M80(Baader) and M90(TS) ? only available with purchase of Steeltrack #2957080

    The RT Steeltrack Adapterset consists of 4 parts: Large Lock-Ring (M90 Internal Thread). 3 chrome grip 'spokes' permit easy rotation and locking of the focuser.72mm Dovetail Ring for attachement to focuser ... Learn More
    Model#: FOC-RTAD
    $62.00

  5. Starlight Instruments - Eyepiece Adapter 2.0 " Dia 0.0 " L - 'Easy Grip' (fits 1.25 " Eyepieces)

    Starlight Instruments - Eyepiece Adapter 2.0 " Dia 0.0 " L - 'Easy Grip' (fits 1.25 " Eyepieces)

    SpecificationsEyepiece Adapter 2.0" Dia 0.0" L - 'Easy Grip' (fits 1 ... Learn More
    Model#: EA20-205EG
    $39.00

  6. Starlight Instruments - Eyepiece Adapter 2.0 " Dia 0 " L - Low Profile Flush Mount with CRing (fits 1.25 " Eyepieces)

    Starlight Instruments - Eyepiece Adapter 2.0 " Dia 0 " L - Low Profile Flush Mount with CRing (fits 1.25 " Eyepieces)

    SpecificationsEyepiece Adapter 2.0" Dia 0" L - Low Profile Flush Mount with CRing (fits 1 ... Learn More
    Model#: EA20-205LP
    $39.00

  7. Starlight Instruments - Eyepiece Adapter 2.0 " Dia 1.61 " L - 'Standard' (fits 1.25 " Eyepieces)

    Starlight Instruments - Eyepiece Adapter 2.0 " Dia 1.61 " L - 'Standard' (fits 1.25 " Eyepieces)

    SpecificationsEyepiece Adapter 2.0" Dia 1.61" L - 'Standard' (fits 1 ... Learn More
    Model#: EA20-205ST
    $39.00

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