The barlow increases the magnification of any 2 inch or 1.25 inch eyepiece by two and a half times
Fully Multicoated Optics; 4 element lens system; hard anodized aluminum barrel is threaded to accept 2 inch filters
2.5x Magnification; anodized aluminum housing; 2 inch barrel diameter
Each Astromania 2inch O-III Filter is individually inspected and proudly inscribed with the percentage of light transmittance of the two O-III emission lines
2Inch O-III Filter greatly enhances contrast during visual observation of gaseous and planetary nebulae in all sky conditions; allows high-contrast imaging even in areas with strong light pollution