Farpoint SSF-125 Solar Filter — 120–125 mm Telescope Tube

The Farpoint SSF-125 Solar Filter is designed for telescopes with 120–125 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: 120–125 mm (4.72–4.92″)
• Filter outer diameter (Mask OD): 129 mm (5.08″)
• Clear aperture (Mask ID): 79 mm (3.11″)
• 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

• Apertura - 90 mm FPL-53 Triplet APO Refractor
• Askar - 103APO Triplet Air-Spaced Refractor OTA
• Celestron - ExploraScope 80AZ Telescope
• Celestron - StarSense Explorer LT 80AZ Refractor Telescope
• Explore Scientific - 80 mm f/6 FCD100 Air-Spaced Triplet Refractor with 2.5" HEX Focuser
• Explore Scientific - ED80 80 mm f/6 Carbon Fiber APO Refractor (Discontinued)
• Explore Scientific - FCD100 80 mm f/6 ED APO Triplet Refractor
• Sharpstar - Z4 100 mm f/5.5 6-Element APO Astrograph
• Sky-Watcher - Esprit 80 mm ED APO Triplet Refractor
• Sky-Watcher - EvoStar 100ED DS-Pro 100 mm f/9 Doublet APO Refractor OTA
• William Optics - Gran Turismo 81 APO Refractor with Internal Focus Design

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.