With a dual narrowband pass-through design, the Kson 1.25′′ O-III filter accurately locks the ionizing oxygen emission line and effectively filters out more than 90% of urban light pollution (such as sodium lamps and mercury lamp interference bands). It can reduce the brightness of the background sky by 2-3 stars, significantly improving the signal-to-noise ratio of targets such as planetary​

This filter is compatible with conventional 1.25-inch telescope eye filters, which is convenient and flexible, and can be seamlessly integrated into your existing telescope configuration.​

Includes:
Kson 1.25′′ O-III filter (optical glass material, aluminum alloy mirror ring anti-deformation);
Shockproof ABS storage box (in line with IP54 dustproof standard, built-in moisture-proof silicone cabin).​

● Kson 1.25′′ O-III filter (optical glass material, aluminum alloy mirror ring anti-deformation);

● Shockproof ABS storage box