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Celestron Neutral Density Moon Filter - 1.25"
Celestron Neutral Density Moon Filter - 1.25"
Celestron Neutral Density Moon Filter - 1.25"
Celestron Neutral Density Moon Filter - 1.25"

Celestron Neutral Density Moon Filter - 1.25"

by Celestron
SKU CEL-94105
CA$28.00 - CA$28.00
CA$28.00
CA$28.00 - CA$28.00
CA$28.00
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  • Reduces overwhelming brightness from the Moon and bright planets
  • Transmits only 13% of incoming light for comfortable viewing
  • Fits all standard 1.25" eyepieces and accessories
  • Neutral density glass provides true-color views without color shifting
  • Stackable design allows use with other planetary filters
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • Celestron Neutral Density Moon Filter - 1.25"

    The Celestron Neutral Density Moon Filter for 1.25" eyepieces makes lunar observing comfortable by cutting overwhelming glare with a specific 13% light transmission rate. This 6 g filter threads into a durable aluminum cell housing, preserving the Moon's natural colors without the tint introduced by color filters. Its stackable design allows you to combine it with other filters to enhance specific planetary features.

    Reduce Lunar Glare with 13% Light Transmission

    A bright Moon can easily wash out surface detail and cause significant eye strain, especially through a larger telescope. This filter solves the problem by blocking 87% of the incoming light, allowing only a comfortable 13% to pass through to your eye. This reduction in brightness reveals subtle features like crater rays, rilles, and maria that are otherwise lost in the glare, transforming an overpowering view into a detailed exploration.

    Neutral Density Design: A True-Color View of the Moon

    Unlike simple colored filters that cut glare but also add an unnatural green or blue cast, this is a true neutral density filter. It reduces the brightness across the entire visible spectrum evenly, so the image you see is dimmed but not color-shifted. You see the Moon's subtle grays, browns, and whites exactly as they are, providing a more authentic and scientifically useful view than a basic #58 green filter can offer.

    • Aluminum Cell Housing: The 31mm x 11.5mm filter is housed in a precision-machined aluminum cell for durability and secure threading.
    • Stackable Threads: The cell is threaded on both sides, allowing you to stack it with other 1.25" filters, such as a light blue filter to enhance detail on Jupiter while simultaneously cutting its glare.

    Beyond the Moon: Increasing Contrast on Planets and Double Stars

    This filter's utility isn't limited to the Moon. The 13% transmission is also highly effective for reducing the glare from bright planets like Venus and Jupiter, making it easier to spot faint cloud details or moons close to the planet's disk. For observers of binary stars, dimming a bright primary star can be the key to cleanly splitting a close, faint companion from its glare.

  • Why use a 13% transmission filter for the Celestron Moon Filter?

    A 13% transmission is considered the sweet spot for lunar viewing. It's dark enough to cut the painful glare of a full or gibbous Moon, especially in telescopes 6" or larger, but not so dark that it extinguishes detail on dimmer crescent phases. It provides a comfortable, high-contrast view across the entire lunar cycle.

    How does the Celestron Neutral Density Moon Filter compare to a color filter like a #58 Green?

    While both reduce brightness, the Neutral Density filter provides a true-color image by dimming all wavelengths of light equally. A #58 Green filter absorbs red and blue light, creating an artificial green tint. For accurate lunar and planetary observing, the Neutral Density filter is superior.

    Can I use this Celestron filter for viewing Venus's phases?

    Absolutely. Venus is intensely bright, which often creates internal reflections and makes its subtle crescent phase difficult to see cleanly. This filter's 13% transmission cuts that glare significantly, providing a much sharper and more comfortable view of the planet's phases.

    Will this 1.25" filter help me split close double stars like Sirius?

    Yes, it can be a very useful tool. The primary star in a pair like Sirius (Alpha Canis Majoris) can completely overwhelm its faint companion, the Pup. By reducing the primary's glare with this filter, you increase the effective contrast, making it easier for your eye to pick out the nearby companion star.

    Is the Celestron Moon Filter stackable with other 1.25" filters?

    Yes, the aluminum cell housing is threaded on both sides. This allows you to screw another filter, like a color planetary filter, directly into it. For example, you could stack it with a #21 Orange filter to enhance detail in Mars's dust storms while also taming its brightness at opposition.

    Does this filter work for solar observing?

    NEVER. This filter is absolutely not safe for solar observing and must never be used to look at the Sun. It does not block the harmful infrared (IR) or ultraviolet (UV) radiation that causes instant and permanent eye damage. Safe solar observing requires a dedicated, full-aperture solar filter designed specifically for that purpose.

  • Size Diameter 31.75mm (1.25")
    Light Transmission 13%
    Filter Type Neutral Density
    Cell Housing Aluminum
    Stackable Yes
    Filter Dimensions 31mm x 11.5mm (1.22" x .45")
    Filter Weight 0.21 oz (6 g)
    Case Dimensions 54.5mm x 43mm x 18mm (2.14" x 1.7" x .7")
    Case Weight 0.5 oz (14 g)
    Total Package Weight 0.88 oz (25 g)

    • Neutral Density Moon Filter - 1.25"

      × 1

    • Protective Plastic Case

      × 1

  • Celestron 2-Year Warranty