Farpoint SSF-316 Solar Filter — 311–316 mm Telescope Tube

The Farpoint SSF-316 Solar Filter is designed for telescopes with 311–316 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-316 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 OD: 311–316 mm (12.24–12.44″) Filter outer diameter (Mask OD): 320 mm (12.60″) Clear aperture (Mask ID): 270 mm (10.63″) Construction: Laser-cut ABS plastic mounting ring, ISO 12312-2 silver-coated polymer solar film, ultra-adhesive hook-and-loop straps Made in USA Field-Tested at 200 mphWe put the SSF mount to a brutal test — a 200 mph backpack leaf blower aimed directly at a mounted solar filter. The ultra-adhesive hook-and-loop straps don’t budge. → Watch the 200 mph leaf-blower test on YouTube Fits These TelescopesSSF-316 is sized to catch a specific cluster of large SCT and Maksutov-Cassegrain telescopes in the 311–316 mm tube OD range. Use our Solar Filter Finder to confirm fit by your specific scope model or measured tube OD. Safe Solar ViewingNever look at the Sun through a telescope without a properly mounted, certified solar filter. Unfiltered solar light causes instant, permanent eye damage. Inspect your filter for pinholes, scratches, or film separations before every use, and discard immediately if any damage is found. Confirm the ultra-adhesive hook-and-loop straps hold the filter firmly in place and cannot work loose before pointing at the Sun. Installation & CarePlace the filter over the front of your telescope, wrap the ultra-adhesive hook-and-loop straps around the tube, and press firmly to engage the adhesive. The filter should be firmly seated and cannot wobble or rotate when properly mounted. Always inspect the filter before each viewing session. Store flat in a clean, dry place when not in use. With proper care, the solar film maintains optical quality for many years of safe observation. Browse the full SSF Solar Filter collection.