Baader ASTF AstroSolar Telescope Solar Filter

Standard solar filters often stretch the film like a drumhead, which can distort the image as temperatures fluctuate. The Baader ASTF cell keeps the film stress-free, ensuring the optical surface remains flat and consistent for sharper, high-resolution views.

This filter produces a neutral white light image. This is generally preferred by observers because it provides a true-to-life representation of the sun, making it much easier to spot subtle surface details like faculae and sunspots.

The unit features adjustable centering bolts that allow you to customize the fit to your telescope's outer diameter. For added peace of mind, the package includes safety straps to keep the filter firmly attached during your observation session.

Yes, the AstroSolar film is designed to perform equally well for both. It provides the necessary safety and optical clarity for high-magnification visual work and high-contrast solar imaging.

No, you must verify your telescope's outer diameter before purchasing. This specific model is engineered to fit telescopes with an outer diameter between 220 mm and 260 mm; using it on a telescope outside these specifications will compromise the fit and safety.