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SVBONY SV139 1.25" ND1.2 Neutral Density Moon Filter
SVBONY SV139 ND1.2 Neutral Density Moon Filter - 1.25"
SVBONY SV139 ND1.2 Neutral Density Moon Filter - 1.25"
SVBONY SV139 ND1.2 Neutral Density Moon Filter - 1.25"
SVBONY SV139 ND1.2 Neutral Density Moon Filter - 1.25"
SVBONY SV139 ND1.2 Neutral Density Moon Filter - 1.25"
SVBONY SV139 ND1.2 Neutral Density Moon Filter - 1.25"
SVBONY SV139 1.25" ND1.2 Neutral Density Moon Filter

SVBONY SV139 ND1.2 Neutral Density Moon Filter - 1.25"

by SVBONY
SKU SV-W9108C
CA$12.00 - CA$12.00
CA$12.00
CA$12.00 - CA$12.00
CA$12.00
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  • Reduces Lunar Glare with ND0.6 Density
  • Transmits 25% of Incoming Light
  • Standard 1.25-inch Barrel Threads
  • Fully Multi-Coated Optical Glass
  • Neutral Color Rendition
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • SVBONY SV139 1.25-inch ND0.6 Neutral Density Filter

    The SVBONY SV139 1.25-inch ND0.6 filter is engineered to transmit just 25% of incoming light, cutting the overwhelming glare from the Moon to reveal fine surface detail. By screwing this filter into any standard 1.25-inch eyepiece, you reduce brightness by a factor of four (a 2-stop reduction), making extended observations comfortable and bringing subtle rilles, crater walls, and ejecta blankets into sharp relief without altering the Moon's natural color.

    ND0.6 Density: 25% Transmission for Comfortable Lunar Viewing

    Observing the Moon, especially near its full phase, can be uncomfortably bright through a telescope, causing temporary dazzle and washing out delicate contrast. The SV139 filter's fixed ND0.6 density provides a 75% reduction in brightness, allowing your eye to relax and perceive the subtle tonal variations across lunar maria and highlands. This level of attenuation is ideal for most small-to-medium aperture telescopes, revealing details that are otherwise lost in the glare.

    Optical Fidelity in a Standard 1.25-inch Cell

    A filter is useless if it degrades the image. The SV139 uses fully multi-coated optical glass to maximize contrast and prevent internal reflections, ensuring the view remains crisp and clear. The precisely machined aluminum cell features standard 1.25-inch filter threads, guaranteeing compatibility with virtually any 1.25-inch eyepiece or accessory, allowing for quick and secure attachment for both visual observation and astrophotography.

  • What does "ND0.6" mean for the SVBONY SV139 filter?

    ND0.6 signifies a Neutral Density filter that allows 25% of light to pass through it (a transmission factor of 10^-0.6). This is equivalent to a 2-stop reduction in exposure for photography and provides a significant, comfortable dimming effect for visual observation of bright objects like the Moon.

    Will the SVBONY SV139 filter change the color of the Moon?

    No. As a neutral density filter, the SV139 is designed to reduce brightness evenly across the entire visible spectrum. It dims the view without introducing any color cast, preserving the natural grey and brown tones of the lunar surface.

    How do I attach the SV139 1.25-inch filter to my telescope?

    The filter has standard threads on its cell that screw directly into the barrel of any 1.25-inch eyepiece. You simply thread it onto the bottom of your chosen eyepiece before inserting the eyepiece into the telescope's focuser.

    Is the SV139 ND0.6 filter dark enough for viewing the full Moon in a 10" Dobsonian?

    Yes, for most observers, an ND0.6 filter is an excellent choice for a 10" telescope, providing a major reduction in glare. However, due to the large light-gathering power of the telescope, some observers may prefer an even darker filter (like an ND0.9, 13% transmission) or a variable polarizing filter for maximum comfort during the brightest phases of the Moon.

    Can I use the SVBONY SV139 filter to view the crescent phase of Venus?

    Absolutely. Venus is another extremely bright target where glare can hide its delicate crescent shape. The SV139 ND0.6 filter is very effective at reducing the planet's brightness, making its phase much easier to see clearly. It can also be useful for splitting bright double stars where one component overwhelms the other.

    Can I use the SV139 ND filter for deep-sky objects like nebulae or galaxies?

    No, this filter is not intended for faint deep-sky objects. It is designed to reduce light, which would make faint objects like the Orion Nebula (M42) or the Andromeda Galaxy (M31) completely invisible. For those targets, you need light pollution or narrowband filters that selectively pass light, rather than block it.

  • Brand SVBONY
    Filter Type Neutral Density (ND)
    Density ND0.6 (25% Transmission)
    Barrel Size 1.25 in

    • SV139 1.25-inch ND0.6 Filter

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  • SVBONY Warranty Policy