Baader ASTF AstroSolar Solar Filter

This filter is designed to fit telescope outer diameters ranging from 180 mm to 220 mm. Before purchasing, measure the outer diameter of your telescope's front cell to ensure it falls within this specific range.

Many glass solar filters introduce a yellow or orange tint to the sun. The Baader AstroSolar film provides a neutral white view, which is generally preferred for solar observation because it allows you to see the true color of the sun and makes it easier to identify subtle details like sunspot granulation.

Solar filters are often used in direct sunlight, which can cause materials to expand or contract. This cell design ensures the filter film remains flat and stress-free regardless of temperature fluctuations, preventing optical distortion and maintaining high image resolution.

Yes, it is designed for both. The high-quality AstroSolar film provides a sharp, high-contrast image that works equally well for looking through an eyepiece or capturing detailed solar photos with a camera.

The unit includes adjustable centering bolts that allow you to customize the fit. You tighten these bolts against the telescope tube to create a stable, secure connection that won't shift during your observation session.

While the film is durable, it is essentially a thin membrane and should be handled with care to avoid punctures or scratches. Always store the filter in its protective case when not in use and avoid touching the film surface directly.