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Alstar 1.25' O-III Filter - Enhance Contrast in Dark Skies - Observe Clear Veil, Ring, Dumbbell and Orion Nebula, Among Many Other Objects

4.9 (2) Write Review
Free shipping on orders over $29.99

$52.99

$ 22 .99 $22.99

In Stock

About this item

  • Each Alstar 1.25 inch O III Filter is individually inspected and proudly inscribed with the percentage of light transmittance of the two O III emission lines
  • Not only useful at light polluted sites; the contrast is also increased at dark sky sites; can be used with all 1.25 inch eyepieces; Filter made from high grade glass with dichroic interference and antireflection coatings
  • Completely blocks virtually all other visible wavelengths of light so views of nebulas are optimized; Increases contrast through selective filtration Anti reflection coated to prevent glaring and ghosting
  • Especially useful for large aperture telescopes through which the light of the Moon can be extremely overwhelming; Allowing just for the Double Ionized Oxygen lines between 496 nm to 501 nm to pass through at 95 percent
  • 1.25 inch O III Filter greatly enhances contrast during visual observation of gaseous and planetary nebulae in all sky conditions; The 1.25 inch filter allows high contrast imaging even in areas with strong light pollution


Product Description

Freedom to Choose

    • Function Point 1

      1.25" filter threads on both sides.

    • Function Point 1

      1.25" filter threads on both sides.

    • Function Point 1

      1.25" filter threads on both sides.

    • Function Point 2

      Enhances the contrast between object and sky.

    • Function Point 2

      Rejecting light pollution.

    • Function Point 2

      Blocks virtually all other visible wavelengths of light.

1

Alstar 1.25" O-III Filter - Enhance Contrast in Dark Skies - Observe Clear Veil, Ring, Dumbbell and Orion Nebula, Among Many Other Objects

1

1.25 inch O III Filter greatly enhances contrast during visual observation of gaseous and planetary nebulae in all sky conditions; The 1.25 inch filter allows high contrast imaging even in areas with strong light pollution

1

Each Alstar 1.25 inch O III Filter is individually inspected and proudly inscribed with the percentage of light transmittance of the two O III emission lines

1

Not only useful at light polluted sites; the contrast is also increased at dark sky sites; can be used with all 1.25 inch eyepieces; Filter made from high grade glass with dichroic interference and antireflection coatings

1

Completely blocks virtually all other visible wavelengths of light so views of nebulas are optimized; Increases contrast through selective filtration Anti reflection coated to prevent glaring and ghosting

1

Especially useful for large aperture telescopes through which the light of the Moon can be extremely overwhelming; Allowing just for the Double Ionized Oxygen lines between 496 nm to 501 nm to pass through at 95 percent


VinceW
Reviewed in the United States on January 17, 2019
It's amazing what this filter can do, enhances the deep space nebulas. Well made and easy to use.
John A.
Reviewed in the United States on August 4, 2018
Works great! Great price!