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Celestron Variable Polarizing Filter - 1.25”
Celestron Variable Polarizing Filter - 1.25”
Celestron Variable Polarizing Filter - 1.25”
Celestron Variable Polarizing Filter - 1.25”
Celestron Variable Polarizing Filter - 1.25”
Celestron Variable Polarizing Filter - 1.25”

Celestron Variable Polarizing Filter - 1.25”

by Celestron
SKU CEL-94107
$42.95 - $42.95
$42.95
$42.95 - $42.95
$42.95
Price Match Policy!
  • Adjustable light transmission from 1% to 40%
  • Standard 1.25” filter format fits most eyepieces
  • Reduces brightness without altering an object's natural color
  • Enhances detail on the Moon and planets
  • Durable and lightweight aluminum cell housing
  • Stackable design allows use with other filters
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • Celestron Variable Polarizing Filter - 1.25”

    The Celestron Variable Polarizing Filter for 1.25” eyepieces gives you precise control over image brightness, with an adjustable light transmission ranging from a dim 1% to a moderate 40%. Weighing just 0.56 oz (16 g), this filter dials in the perfect view of bright celestial objects by simply rotating the aluminum cell housing. Unlike fixed-transmission moon filters, this variable design allows you to adapt to changing seeing conditions or target altitudes in real-time.

    Adjustable Light Control: From 1% to 40% Transmission

    The core of this filter is its ability to act as a dimmer switch for your telescope. By rotating the lower ring of the two-piece filter, you can smoothly adjust the amount of light reaching your eye from 40% all the way down to just 1%. This is a significant advantage over single-transmission neutral density or moon filters, which often make the view too dark or not dark enough.

    This level of control is essential for observing the Moon, where the ideal brightness changes dramatically with its phase. A full Moon requires maximum dimming to reduce glare and see fine rille and crater detail, while a thin crescent may only need a slight reduction in brightness. This filter adapts to any scenario without requiring you to swap out accessories.

    Lunar and Daytime Planetary Observing: Enhanced Contrast Without Color Shift

    The Celestron Variable Polarizing Filter reduces brightness without altering the true color of the celestial object, a critical feature for both visual observers and astro-imagers. When viewing the Moon, this neutral filtration cuts through the overwhelming glare, allowing subtle details along the terminator to become clearly defined. For imagers, it prevents bright lunar highlands from being overexposed, preserving data in your final image.

    This filter also excels at daytime astronomy. It can be used to darken the bright blue sky, dramatically increasing the contrast of Venus or Jupiter against the background. This makes it possible to locate and observe planets long before sunset, extending your available viewing time.

    Smart Design: Stackable 1.25” Aluminum Cell

    Built with a lightweight yet durable aluminum cell housing, the filter adds only 0.56 oz (16 g) to your eyepiece, ensuring it won't create balance issues on your telescope. The standard 31.75mm (1.25") filter threads are compatible with virtually all 1.25" eyepieces and many accessories.

    For advanced applications, the filter is stackable. Both sides of the housing are threaded, allowing you to attach additional filters, such as a color filter to bring out specific details on a planet's surface while simultaneously controlling its brightness. This adds another layer of utility, letting you create custom filter combinations for specific targets.

  • Why use the Celestron Variable Polarizing Filter instead of a standard Moon filter?

    A standard Moon filter has a fixed light transmission (typically 13% or 25%). The Celestron Variable Polarizing Filter allows you to adjust the brightness from 1% to 40%. This means you can dial in the perfect brightness for any lunar phase, telescope aperture, or seeing condition, which is impossible with a fixed filter.

    Will this 1.25” filter change the color of planets like Jupiter or Mars?

    No, it will not. The filter is designed to be color-neutral, reducing brightness across the visual spectrum evenly. This means Jupiter's cloud bands and Mars' polar caps will retain their natural colors, just at a more comfortable brightness level.

    How does the Celestron Variable Polarizing Filter help with viewing Venus during the day?

    Daytime viewing is a challenge because the planet is faint against a bright blue sky. This filter darkens the sky background significantly, which increases the contrast and makes the planet "pop" into view. It allows you to find and observe planets that would otherwise be lost in the glare.

    Can I stack this filter with other 1.25" filters?

    Yes. The aluminum cell is threaded on both sides, making it fully stackable. You can, for example, thread it onto a #80A Blue filter to enhance details on Jupiter while also using the polarizing feature to reduce its overall brightness for more comfortable viewing.

    Is the Celestron Variable Polarizing Filter difficult to adjust while on the eyepiece?

    No, it's designed for easy use at the telescope. Once threaded onto your 1.25" eyepiece, you simply grip and rotate the bottom section of the filter housing. This smooth rotation changes the polarization angle, dimming or brightening the view without needing to remove the eyepiece.

    Is this filter useful for deep-sky objects?

    Generally, no. Deep-sky objects like galaxies and nebulae are extremely faint, and the goal is to gather as much light as possible. This filter is designed to reduce the light from very bright objects like the Moon, planets, and double stars. Using it on a faint nebula would make it invisible.

  • Size Diameter 31.75mm (1.25")
    Light Transmission Adjustable (1% to 40%)
    Cell Housing Aluminum
    Stackable Yes, threaded on both sides
    Filter Dimensions 31.4mm x 22.4mm (1.23" x .88")
    Filter Weight 0.56 oz (16 g)
    Case Dimensions 68mm x 28mm (2.67" x 1.1")
    Case Weight 0.91 oz (26 g)
    Total Package Weight 1.7 oz (50 g)
    • Celestron 1.25-inch Variable Polarizing Filter

      Variable Polarizing Filter - 1.25”

      × 1

    • Plastic protective case for the filter

      Filter Case

      × 1

  • Celestron 2-Year Warranty