Farpoint SSF-140 Solar Filter — 135–140 mm Telescope Tube

The Farpoint SSF-140 Solar Filter is designed for telescopes with 135–140 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.

Specifications

• Fits telescope tube OD: 135–140 mm (5.31–5.51″)
• Filter outer diameter (Mask OD): 144 mm (5.67″)
• Clear aperture (Mask ID): 94 mm (3.70″)
• 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 mph

We 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 Telescopes

• Askar - 120 APO Triplet Air-Spaced Refractor OTA
• Explore Scientific - 102 mm f/7 Air-Spaced ED APO Triplet Refractor with FCD-100 Optics and HEX Focuser
• Explore Scientific - FCD100 102 mm f/7 ED APO Triplet Refractor

Don’t see your scope? Use our Solar Filter Finder to confirm fit by telescope model or measured tube OD.

Safe Solar Viewing

Never 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 & Care

Place 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.