Astrozap Solar Filter

You need to measure the outside diameter (OD) of your telescope's front cell or dew shield. This filter is specifically designed for telescopes with an outer diameter between 171mm and 178mm; if your measurement falls outside this range, it will not fit securely.

Yes, this is a full-aperture glass solar filter designed specifically for safe solar observation. It blocks the vast majority of harmful light, allowing you to view the sun's surface features safely through your telescope.

Glass filters like this one are generally preferred for their durability and the natural, yellowish-orange tint they provide. While film filters can offer slightly higher contrast, glass filters provide a more robust, long-lasting solution for frequent solar observers.

Yes, this filter is compatible with a wide range of telescope designs, including refractors, reflectors, Schmidt-Cassegrains, Maksutov-Cassegrains, and Dobsonians. Just ensure the outer diameter of your telescope tube or dew shield matches the 171mm to 178mm specification.

Keep the glass surface clean by gently blowing off dust with compressed air or using a high-quality lens cleaning cloth. Avoid using harsh chemicals or abrasive materials, as these can damage the specialized solar coating on the glass.