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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.
SVBONY SV139 1.25" ND3.0 Neutral Density Moon Filter
SVBONY SV139 ND3.0 Neutral Density Moon Filter - 1.25"
SVBONY SV139 ND3.0 Neutral Density Moon Filter - 1.25"
SVBONY SV139 ND3.0 Neutral Density Moon Filter - 1.25"
SVBONY SV139 ND3.0 Neutral Density Moon Filter - 1.25"
SVBONY SV139 ND3.0 Neutral Density Moon Filter - 1.25"
SVBONY SV139 ND3.0 Neutral Density Moon Filter - 1.25"
SVBONY SV139 1.25" ND3.0 Neutral Density Moon Filter

SVBONY SV139 ND3.0 Neutral Density Moon Filter - 1.25"

by SVBONY
SKU SV-W9108D
$9.59 - $9.59
$9.59
$9.59 - $9.59
$9.59
Price Match Policy!
  • ND3.0 Neutral Density Filter
  • Standard 1.25-inch Barrel Size
  • Transmits 0.1% of Incoming Light (10-Stop / 1000× Reduction)
  • Ideal for Herschel Solar Wedges & Solar Imaging Accessories
  • Fully Multi-Coated Optical Glass in Black Anodized Aluminum Cell
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • SVBONY SV139 1.25-inch ND3.0 Neutral Density Filter

    The SVBONY SV139 1.25-inch ND3.0 Neutral Density filter provides an intense 0.1% light transmission (a 10-stop or 1000× reduction) without altering natural color rendition. This specialized filter threads directly into standard 1.25-inch eyepieces and accessories, serving as an essential light attenuation tool primarily used alongside Herschel solar wedges, dedicated solar setups, and specialized solar imaging rigs.

    ND3.0 Transmission: Safe Light Reduction for Solar Wedges & Imaging

    Because an ND3.0 filter cuts 99.9% of incoming light, it is far too dark for nighttime lunar or planetary observation. Instead, its core application is downstream solar light control. When paired with a Herschel solar wedge (which reflects 95–96% of sunlight away), the SV139 ND3.0 filter safely steps down the remaining intense beam to a comfortable level for white-light solar viewing of sunspots, granulation, and solar faculae.

    Multi-Coated Optical Glass in a Standard 1.25" Cell

    Constructed with high-quality fully multi-coated optical glass, the SV139 minimizes internal reflections and maintains crisp image contrast. The standard 1.25-inch cell features double-sided threads (M28.5 x 0.6mm), allowing you to easily stack it with a Polarizing filter or a solar continuum filter for further light fine-tuning.

  • What is the main use for an ND3.0 filter in astronomy?

    An ND3.0 filter reduces light intensity by 99.9% (transmitting just 0.1%, or a 10-stop reduction). Because it is so dark, it is primarily used in solar observation downstream of a Herschel solar wedge to bring the remaining light down to safe, comfortable visual or photographic levels.

    Can I look at the Sun using ONLY this ND3.0 filter on my eyepiece?

    NO. NEVER use an ND3.0 filter alone at the eyepiece for solar viewing. Unfiltered sunlight focused by a telescope aperture will instantly shatter or melt an eyepiece filter and cause permanent blindness. An ND3.0 filter must only be used behind a proper front-aperture solar filter or inside a dedicated Herschel solar wedge.

    Can I use the SVBONY ND3.0 filter for nighttime viewing of the Moon?

    No, an ND3.0 filter is generally far too dark for nighttime lunar observing. Cutting 99.9% of the light will render the lunar surface dim and difficult to perceive. For visual lunar observing, lighter filters like ND0.6 (25% transmission), ND0.9 (12.5% transmission), or ND1.2 (6.25% transmission) are recommended.

    How is the ND3.0 filter used with a Herschel Solar Wedge?

    A Herschel wedge dumps ~95% of incoming solar energy out of its heat trap, but the remaining 5% light beam is still too bright for direct human eyes. Threading the ND3.0 filter into the wedge's eyepiece barrel reduces that remaining light by 99.9%, bringing the final view into a safe, comfortable intensity range for white-light solar observing.

    Can I stack the SVBONY SV139 ND3.0 with other filters?

    Yes. The SV139 aluminum cell features threads on both sides. In solar setups, observers frequently stack an ND3.0 filter with a Variable Polarizer (to fine-tune brightness) or a Solar Continuum filter (to highlight sunspot details and contrast).

    How do I attach the SVBONY SV139 filter to my setup?

    The filter features standard 1.25-inch threads (M28.5 x 0.6mm). It simply threads onto the bottom barrel of any standard 1.25-inch eyepiece, camera nosepiece, or Herschel wedge accessory adapter.

  • Brand SVBONY
    Model SV139
    Filter Type Neutral Density (ND)
    Optical Density ND3.0 (0.1% Transmission / 10-Stop)
    Barrel Size 1.25 in (M28.5 x 0.6 Thread)

    • SVBONY SV139 1.25" ND3.0 Filter

      × 1

    • Plastic Storage Case

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  • SVBONY 1-Year Warranty