Telescopes & Astronomy

• High-performance observational eyepiece filter markedly improves views of Mars
• Fully-coated Mars filter increases contrast to bring out subtle details on the disc of the red planet
• When using the Mars filter on a clear, dark evening you'll see polar ice cap detail, subtle mare shadings, duststorm and cloud activity
• Eyepiece filter dramatically improves views of Mars even in smaller astronomical telescopes
• Designed to fit 1.25" telescope eyepieces with filter threads. Metal filter cell construction.

The Sirius Optics 1.25-inch UHC Skyglow Broadband CLS Filter is designed for visual deep-sky observation, allowing nearly 100% transmission of critical O-III, H-beta, and H-alpha emission lines while filtering out unwanted light pollution. By dramatically reducing sky background glow, this filter reveals gas and planetary nebulae with stunning detail, making it an excellent choice even for smaller telescopes.

• For use with 2” eyepieces.
• One of the essential eyepiece filters for visual astronomy.
• Reduce glare from bright objects such as the Moon, Venus, and Jupiter.
• Accentuate subtle detail for the Moon and planets
• Polar ice caps of Mars in large telescopes
• Limb hazes and terminator clouds of Mars

• For use with 1.25” eyepieces.
• More light transmission than 13%, making it great for planets.
• Reduce glare from bright objects such as the Moon, Venus, Saturn, and Jupiter.
• Accentuate subtle detail for the Moon and planets
• Polar ice caps of Mars in large telescopes
• Limb hazes and terminator clouds of Mars