Moon Filter for Telescope Eyepiece - SVBONY SV139 1.25 inch ND16 Neutral Density Filter

The SVBONY SV139 Telescope ND16 filter is a must-have item for observing the moon. This filter transmits only 6.25% of the incoming light, boosting contrast and the ability to discern detail on the Moon's surface. Importantly, it has a perfectly neutral color that will not alter the natural appearance of the lunar landscape.

One of the key functions of this telescope filter is to help reduce glare, allowing you to see more details and surface features of the Moon with your telescope. This is particularly beneficial during the waning gibbous phase, the first week after a full moon, when the illuminated portion of the lunar disc is decreasing. The ND16 filter is highly effective at this stage, alleviating the pain and potential eye strain caused by the bright moonlight.

Constructed with quality in mind, the SV139 filter features an aluminum alloy frame with a sealing ring for better tightness and to prevent it from falling or becoming loose. The wider outer optic helps reduce vignetting at wide angles, and the filter is made with high-quality optical glass for maximum sharpness. It comes housed in a sturdy plastic case, ensuring it is protected from dust and other environmental pollutants.

In terms of optical performance, the SV139 Telescope Filter transmits only 6.25% of the incoming light, making it suitable for observing the three-quarter moon. This reduced light transmission helps to boost contrast, allowing you to discern more surface details without the glare and brightness overwhelming the view. Importantly, the filter does not affect the natural color of the Moon, preserving its authentic appearance.

The comfortable user experience is another key advantage of this filter. By reducing the overall brightness without altering the color, it allows you to see more surface features and details while also making your eyes more comfortable during prolonged viewing sessions. This is especially important when observing the three-quarter moon, as the majority of the lunar surface is brightly illuminated, which can potentially damage dark-adapted vision.

Regarding the specifications, the SV139 filter has a 1.25-inch barrel diameter and a standard M28.5x0.6mm thread, allowing it to be easily integrated into the 1.25-inch barrel of your telescope's eyepiece. This makes it compatible with a wide range of astronomical telescopes, where the intense light of the Moon can otherwise be overwhelming.

In summary, the SVBONY SV139 Telescope ND16 filter is a high-quality accessory that enhances the observation of the Moon by reducing glare, boosting contrast, and protecting your eyes from the bright lunar illumination. Its durable construction, neutral color, and universal compatibility make it a valuable addition to any stargazer's toolkit.

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