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IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
TeleVue Ethos-SX 4.7mm 110° Eyepiece - 1.25"/2"
TeleVue Ethos-SX 4.7mm 110° Eyepiece - 1.25"/2"
TeleVue Ethos-SX 4.7mm 110° Eyepiece - 1.25"/2"

TeleVue Ethos-SX 4.7mm 110° Eyepiece - 1.25"/2"

by TeleVue
SKU TV-ETH-04.7
$745.00 - $745.00
$745.00
$745.00 - $745.00
$745.00
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  • 4.7mm Focal Length
  • 110° Apparent Field of View
  • 2" / 1.25" Hybrid Barrel
  • 15mm Eye Relief
  • 8.9mm Field Stop
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  • TeleVue Ethos 4.7mm SX 110° Eyepiece - 2" / 1.25"

    If you are looking for the highest practical magnification while still keeping the object comfortably in view, the 4.7mm Ethos SX sits in a very specific category: extreme power without losing context. This focal length represents a pinnacle in wide field optical engineering, pushing the boundaries from the standard 100° to a massive 110° Apparent Field of View. This provides 21 percent more field area than a 100° eyepiece, creating a viewing experience where the equipment boundaries completely disappear.

    This is a specialist eyepiece. In a typical 8" or larger telescope, it delivers very high magnification that only works well when atmospheric conditions cooperate. When they do, it gives you a level of detail on the Moon, planets, and compact deep sky objects that is difficult to achieve while still maintaining a wide, usable field. The 8.9mm field stop is optimized to provide high magnification while still offering enough sky context to frame entire lunar crater complexes or large planetary nebulae.

    The extra space provided by the 110° field is not just visual comfort. It is what makes high magnification usable in manual tracking telescopes, where keeping objects centered would otherwise become a constant effort. It is parfocal with the 3.7mm Ethos SX, allowing for seamless high power transitions when atmospheric conditions permit.

    High Power Without Losing the Object

    At 4.7mm, you are firmly in high magnification territory. In most telescopes, this is where the view normally becomes narrow and demanding to track. The 110° field changes that experience by expanding the peripheral view, allowing you to use high magnification without the claustrophobic sensation typically associated with short focal length eyepieces.

    • Lunar Exploration: Wide enough to capture the entire Alpine Valley or the floor of Copernicus with enough surrounding terrain to maintain a sense of scale.
    • Planetary Viewing: Jupiter, Saturn, and Mars remain in the field significantly longer in manual Dobsonian setups, reducing constant nudging and letting you focus on Jovian detail instead of tracking.
    • Deep Sky Contrast: The short focal length produces a very small exit pupil that darkens the sky background to the extreme, making subtle filaments in the Ring Nebula or the Eskimo Nebula stand out.

    This is not a general purpose eyepiece. It is designed for nights when seeing supports high magnification and you want to extract maximum detail without switching to a narrow, restrictive field.

    When This Eyepiece Works Best

    The 4.7mm Ethos SX is only as good as your observing conditions and telescope setup. In steady seeing conditions, it becomes one of the most powerful visual tools available for resolving fine planetary and lunar structure. In average or turbulent seeing, the magnification will often exceed what the atmosphere can support, regardless of optical quality. In those conditions, a 6mm or 8mm Ethos will usually deliver a more consistent result.

    This is why experienced observers treat the 4.7mm as a seeing dependent eyepiece rather than a daily use focal length. However, for owners of fast Newtonians or short focal length refractors, it often becomes the primary tool for high resolution work.

    Hybrid Mounting and Optical Design

    The Ethos 4.7mm SX uses Tele Vue’s hybrid 2" / 1.25" barrel system, allowing it to integrate with a wide range of focusers and diagonals without adapters. Like all Tele Vue Ethos eyepieces, it uses advanced multi coatings and fully blackened internal surfaces to maintain contrast at high magnification, where optical imperfections become more noticeable.

    In fast Newtonians, a Tele Vue Paracorr Type 2 is recommended to maintain pinpoint stars across the full 110° field, especially when observing bright planets or high contrast lunar detail. This ensures that the massive field of view is sharp from center to edge.

  • What does SX mean in the Ethos 4.7mm?

    SX stands for Super eXtended. It refers to the expanded 110° apparent field of view, which increases the usable field area by 21 percent compared to standard 100° Ethos models.

    Is the 4.7mm Ethos too much magnification for most telescopes?

    In many 8" SCTs and larger long focal length telescopes, 4.7mm produces very high magnification (over 400x) that is only usable during steady atmospheric conditions. In faster Newtonians or refractors, it falls into a more practical high power range of 200x to 250x.

    How does the 110° field help at high magnification?

    At high power, narrow field eyepieces require constant tracking. The 110° field keeps objects in view much longer, especially in manual Dobsonians, making high magnification more comfortable and less demanding to use.

    What eye relief does it provide?

    The eyepiece provides 15mm of eye relief, which is sufficient for most observers. For those with astigmatism, the 4.7mm Ethos SX is fully compatible with the Tele Vue Dioptrx corrector for sharp views without glasses.

    Do I need a Paracorr with this eyepiece?

    In fast Newtonians (around f/4.5 or faster), a Paracorr Type 2 is recommended to correct mirror coma and maintain edge sharpness across the vast 110° field.

  • Model # ETH-04.7
    Focal Length 4.7 mm
    Barrel Size 2" / 1.25" Hybrid
    Apparent Field of View 110°
    Eye Relief 15 mm
    Field Stop Diameter 8.9 mm
    Weight 1.0 lb (16 oz / 454 g)
    Filter Compatibility Threaded for 1.25" and 2" Filters
    Dimensions 53.3 x 147 mm
    • Ethos 4.7mm SX Eyepiece

      Ethos 4.7mm SX Eyepiece

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  • Tele Vue 5-Year Limited Warranty for Telescopes and Accessories