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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.
iOptron Green Moon Filter

iOptron Green Moon Filter

by iOptron
SKU IOP-TFE100
$14.00 - $14.00
$14.00
$14.00 - $14.00
$14.00
Price Match Policy!
  • Enhances contrast on lunar and planetary features
  • Reduces glare for more comfortable viewing
  • Improves detail in Martian polar caps and dust storms
  • Highlights cloud structures on Jupiter and Saturn
  • Threads into standard astronomy eyepieces and accessories
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • Green Moon Filter

    The Green Moon Filter is a fundamental tool for visual observers seeking to increase contrast and reduce glare when viewing bright celestial objects. By selectively passing green light, this filter darkens the sky background and enhances specific surface and atmospheric details on the Moon and planets that are often washed out by unfiltered light. It provides a significant improvement in observable detail, making it an essential accessory for any eyepiece collection.

    Enhancing Lunar Detail: From Bright Maria to Subtle Rilles

    When observing the Moon, especially during its brighter phases, overwhelming glare can flatten the view and hide subtle features. The Green Moon Filter dims the image to a more comfortable level while dramatically increasing the contrast between lunar features with different albedos (reflectivity). It excels at separating bright ejecta rays from the surrounding terrain and defining the boundaries of dark maria and the floors of craters.

    Planetary Observation: Isolating Features on Mars, Jupiter, and Venus

    Beyond the Moon, the Green Moon Filter is a versatile planetary accessory. On Mars, it improves the visibility of the polar ice caps and highlights surface frost and high-altitude clouds. For Jupiter and Saturn, it boosts the contrast of their atmospheric belts and zones. It's particularly effective at making the Great Red Spot on Jupiter stand out more clearly and can even help in discerning the faint cloud patterns on Venus.

    Green vs. Neutral Density: Choosing the Right Filter for the Moon

    Observers often choose between a green filter and a standard neutral density (ND) or "Moon" filter. While both reduce brightness, they serve different purposes.

    • Neutral Density Filter: This filter reduces brightness uniformly across the entire visual spectrum, like sunglasses for your telescope. It provides a natural color view and is purely for glare reduction.
    • Green Moon Filter: This filter provides targeted contrast enhancement by transmitting only a specific portion of the spectrum. While it also reduces glare, its primary function is to make specific red and blue-toned features appear darker, thereby increasing the visibility of subtle details. For detailed study, the green filter is often the superior choice.

  • What does the Green Moon Filter do to the view of the Moon?

    The Green Moon Filter increases contrast and reduces overall glare. This makes it easier to see fine details like crater walls, rilles, and the subtle textures of the lunar maria. It gives the Moon a green tint but makes surface features stand out more distinctly.

    Is the Green Moon Filter useful for planets?

    Yes, it is highly effective for several planets. It helps to distinguish the polar caps and dust storms on Mars, enhances the visibility of the cloud belts and Great Red Spot on Jupiter, and can reveal faint patterns in the thick atmosphere of Venus.

    How does the Green Moon Filter improve views of Mars?

    When observing Mars, the Green Moon Filter is excellent for increasing the contrast of the white polar ice caps against the planet's reddish surface. It also helps in identifying high-altitude atmospheric hazes and localized dust storms, which can be difficult to see without filtration.

    Can I use the Green Moon Filter to see cloud bands on Jupiter?

    Absolutely. The Green Moon Filter enhances the boundaries between Jupiter's reddish-brown belts and its lighter zones. It is particularly useful for making the Great Red Spot (GRS) appear more defined and can help resolve smaller, transient storms within the Jovian atmosphere.

    Will this Green Moon Filter make the image dimmer?

    Yes, all color filters reduce the total amount of light reaching your eye. This dimming effect is beneficial as it reduces glare on bright objects like the Moon and planets, making extended observation more comfortable and revealing more detail.

    How is a Green Moon Filter different from a variable polarizing filter?

    A Green Moon Filter enhances contrast by selectively transmitting green light, which helps specific features stand out. A variable polarizing filter is a type of neutral density filter that allows you to adjust the brightness from about 1% to 40% transmission without altering color. The polarizer is for controlling glare, while the green filter is for boosting contrast.

  • Filter Type Colored Glass Filter - Green
    Primary Use Lunar & Planetary Visual Observing

    • Green Moon Filter

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    • Protective Case

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  • Warranty information for this product is not available.