GSO 1.25" Color / Planetary Filter - #11 Yellow / Green

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In Stock (10+ Available)
Ships by Next Business Day
Our Product ID: OFIL-GS-1FIL-11
Manufacturer SKU: AD058
Item Can Ship: Worldwide
GSO 1.25" Color / Planetary Filter - #11 Yellow / Green

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Quick Overview

  • #11 Yellow-green filter enhances the view of cloud bands and delicate cloud bands and festoons of Jupiter and Saturn, darkens the maria of Mars, and improves the view of Uranus and Neptune
  • Threads into eyepieces and accessories with standard 1.25" threads (M28.5x0.6)
  • Stackable to achieve filtration of multiple parts of the optical spectrum
  • Plastic storage case included

Product Details

Color filters can be very useful for enhancing your views of the Moon and the planets. Depending on the atmospheric conditions, the telescope being used, the observer's experience, and the planet being observed or photographed, the advantages of color filters can be anywhere from subtle to dramatic. The right filter can make all the difference between seeing several small craters in the floor of Clavius on the Moon or not; seeing five or six swirls in Jupiter's belts or not; or seeing the inner Crepe Ring of Saturn or not.

GSO's 1.25" color/planetary filters are manufactured from the purest optical glass and are dyed-in-the-mass (not simply "color coated") for premium performance. They thread into the barrels of virtually any 1.25" telescope eyepiece. Each filter cell has a male and female 1.25" filter thread (M28.5x0.6) on opposite sides, so multiple filters can be stacked to achieve selective filtration of the visual color spectrum. The clear aperture is 25.6mm and each filter comes in a protective plastic storage case. Made in Taiwan.

The #11 Yellow-Green Filter color contrasts well with the red and blue characteristics of surface features on Jupiter and, to some degree, Saturn. It darkens the Maria visible on Mars and accentuates the Cassini Division in Saturn's rings. It also improves visual detail on Uranus and Neptune slightly, again in telescopes with 10" or more of aperture.

Useful Resources

Agena Informational Article: Choosing a Color / Planetary Filter