Sky-Watcher Solar Filter 90mm for Maksutov-Cassegrain

The Sky-Watcher Solar Filter 90mm for Maksutov-Cassegrain allows you to conduct safe solar viewing by reflecting harmful rays and reducing the intensity of sunlight. Utilizing premium Baader Astro Solar Safety Film, this filter transmits only 1/100,000 of visible light while reflecting 99.999% of unwanted radiation. This durable film significantly decreases harmful ultraviolet and infrared light, and it has been declared safe for direct solar viewing by the German National Bureau of Standards for eye safety. By securing this filter over the front of your telescope, you can transform your Maksutov into a powerful solar observer.

Designed to deliver the optical performance of plane-parallel glass, the double-sided metal coatings on the film’s surface ensure excellent color balance and allow you to view the Sun in its natural white light. This clarity enables you to see amazing details such as sunspots, bright faculae near the solar limb, and the mottled textures known as granules. Viewing the Sun is a fantastic source of astronomical knowledge and fun, and this filter provides a completely safe way to observe one of the most dynamic objects in our sky.

Product Features in Detail

High-Fidelity Solar Texture
Unlike cheaper Mylar filters that can tint the sun blue or orange, the Baader film used in this Sky-Watcher filter provides a neutral white image. This allows you to see ""granulation""—the bubbling convection cells on the Sun's surface—with much higher clarity.

Double-Sided Metal Coating
The safety film is coated on both sides with specialized metallic layers. This dual-coating ensures that even if a microscopic pinhole were to develop on one side, the other side continues to provide full protection, ensuring consistent eye safety.

Observing Solar Activity
With this filter, you can track the lifecycle of sunspots as they merge, grow, and rotate across the solar disc. You can also spot ""faculae,"" which are bright magnetic regions that become most visible as they approach the edge (limb) of the Sun.

Safe for Your Equipment
Solar heat can easily melt the internal plastic components or secondary mirror mounts of a telescope. By reflecting the energy at the very front of the tube, this filter keeps the interior of your Maksutov cool and protected.

Durable Construction
The Baader film is surprisingly tough and resistant to tearing. While it should always be handled with care, its durability ensures that it remains a reliable part of your astronomy kit for many years of solar cycles.

Educational and Family-Friendly
The Sun is the only star we can see in high definition. This filter makes solar eclipses, planetary transits, and daily solar changes accessible to the whole family, providing a unique educational tool that works during the day.