Skip to content
SVBONY SV139 1.25" ND0.6 Neutral Density Moon Filter
SVBONY SV139 ND0.6 Neutral Density Moon Filter - 1.25"
SVBONY SV139 ND0.6 Neutral Density Moon Filter - 1.25"
SVBONY SV139 ND0.6 Neutral Density Moon Filter - 1.25"
SVBONY SV139 ND0.6 Neutral Density Moon Filter - 1.25"
SVBONY SV139 ND0.6 Neutral Density Moon Filter - 1.25"
SVBONY SV139 ND0.6 Neutral Density Moon Filter - 1.25"
SVBONY SV139 1.25" ND0.6 Neutral Density Moon Filter

SVBONY SV139 ND0.6 Neutral Density Moon Filter - 1.25"

by SVBONY
SKU SV-W9108A
CA$13.00 - CA$13.00
CA$13.00
CA$13.00 - CA$13.00
CA$13.00
Price Match Policy!
  • Reduces lunar glare with a fixed ND0.6 optical density
  • Transmits a neutral 25% of incoming light
  • Standard 1.25-inch barrel fits most eyepieces
  • Multi-coated optical glass for maximum contrast
  • Durable anodized aluminum filter cell
Backordered
Request Stock Alert
Availability Info
Qualifies for FREE Shipping in Canada on orders over $500.
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

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

    The SVBONY SV139 ND0.6 filter is a fixed-transmission neutral density filter for any standard 1.25-inch eyepiece, designed to reduce overwhelming lunar brightness to comfortable levels. By transmitting a neutral 25% of incoming light, the ND0.6 filter reveals subtle surface details on the Moon, from fine rilles to complex crater walls, without altering its natural color balance.

    Taming Lunar Glare: The ND0.6 (25% Transmission) Advantage

    Observing the Moon, especially near its full phase, can be uncomfortably bright through a telescope, causing your pupil to contract and washing out fine detail. The SV139 ND0.6 filter cuts this glare by 75%, allowing your eye to relax and perceive significantly more surface contrast. This fixed 25% transmission is an ideal all-purpose reduction for viewing different lunar phases in a wide range of telescope apertures.

    1.25" Anodized Aluminum Cell with Multi-Coated Optics

    The SV139 filter is built into a durable, black-anodized aluminum cell that threads directly onto any standard 1.25-inch eyepiece or accessory. The optical glass is fully multi-coated to suppress internal reflections and ghosting, ensuring that the only thing you see is a sharp, high-contrast image of your target. This construction prevents the filter itself from degrading the view it's meant to improve.

    SV139 ND0.6 vs. Variable Polarizing Filters: Simplicity and Throughput

    A variable polarizing filter offers adjustable brightness, which can be useful for different targets. However, the SVBONY SV139 ND0.6 filter's single-element design provides higher light throughput and fewer internal surfaces for reflections compared to a stacked polarizer. Its simplicity means there's no need to dial in the correct setting—it delivers a consistent 25% transmission for reliable, high-contrast lunar views every time.

  • How does the SVBONY SV139 ND0.6 filter perform on the full Moon in an 8" SCT?

    It's an excellent match. An 8" Schmidt-Cassegrain gathers significant light, making the full Moon uncomfortably bright. The ND0.6 filter reduces the glare to a comfortable 25%, allowing you to see sharp detail along the terminator and within bright ray systems like those of Copernicus and Tycho without dazzling your eye.

    Can I use the SVBONY SV139 filter to see more detail on Jupiter?

    Yes, particularly in larger telescopes. While primarily a lunar filter, the SV139 can reduce the intense brightness of planets like Jupiter and Venus, which can help in discerning subtle features. In an 8" or larger telescope, cutting the glare can make it easier to pick out faint cloud bands or the Great Red Spot on Jupiter.

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

    ND0.6 refers to an optical density of 0.6. This means the filter transmits 10-0.6, or 25%, of the light that passes through it. It's a logarithmic scale where ND0.3 is 50% transmission, ND0.6 is 25%, and ND0.9 is 12.5%. The ND0.6 is considered a great medium-level filter for general lunar work.

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

    No. As a neutral density filter, the SV139 is engineered to reduce brightness equally across the entire visible spectrum. Unlike color filters (e.g., yellow or blue), it will not impart any tint, preserving the Moon's true grey and white coloration.

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

    The filter has standard 1.25-inch filter threads (M28.5x0.6). You simply screw it into the threaded barrel of any standard 1.25-inch eyepiece. It can also be attached to other 1.25-inch accessories like diagonals or Barlow lenses that accept filters.

    Is the SVBONY SV139 ND0.6 a good choice for astrophotography?

    Yes, for lunar and bright planetary imaging. It helps prevent the camera sensor from being overexposed by the bright lunar surface or planets. This allows you to use longer exposure times to capture fainter details or lower the camera's gain for reduced noise in your final image.

  • Brand SVBONY
    Filter Density ND0.6
    Barrel Size 1.25 in

    • SV139 1.25" ND0.6 Filter

      × 1

  • SVBONY Warranty Policy