Farpoint SSF-172 Solar Filter — 167–172 mm Telescope TubeThe Farpoint SSF 172 Solar Filter is designed for telescopes with 167172 mm tube outer diameter. ISO 12312 2 certified solar film blocks 99. 999% of harmful UV and IR radiation, delivering a sharp, natural color white light view of the Sun, sunspots, transits, and partial eclipses. SSF 172 is a specialty SKU in the Farpoint SSF line, sized between grid points to provide tighter fit for specific telescope clusters. Specifications Fits telescope tube