Each Alstar 2" 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 2" 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 496mm to 501nm to pass through at 95%.
2" O-III Filter greatly enhances contrast during visual observation of gaseous and planetary nebulae in all sky conditions. Astrophotographic 2" filter allows high-contrast imaging even in areas with strong light pollution.
Alstar Guide Scope Mount - The Convenient Way to Mount Your Guide Scope
KWD 62
Alstar 2" Narrowband NBPF Hydrogen-a 12nm Filter - Enhances The Contrast Between Object and Sky - Allows You to Take Images Even Under Urban Skies
KWD 55.500
Alstar 1.25" Astrophotography Flip Mirror with Eyepiece Adapter - The flip Mirror for Precise Focusing
KWD 51.500
Alstar 1.25" 4mm 58-Degree Planetary Eyepiece for Telescope
KWD 21
