Telescopes
Slip-on solar filters sized to your telescope’s front tube OD for safe white-light viewing.
Shop by Device: Find the Right Solar Filter for Your Gear
This page helps you choose the right front-mounted solar filter path for your equipment. Slip-on filters are sized by the outside diameter (OD) of the front mounting surface. Threaded camera filters use the lens’s exact Ø thread size.
Front-mounted only.
Always use a secure filter installed on the front of your optic. Never use eyepiece/behind-the-lens solar filters. Review safe setup and inspection before first use: Solar Filter Safety.
Choose Your Device
Spotting Scopes
Slip-on filters sized to the objective housing OD (the front barrel). Great for daytime outreach and field optics.
Camera Lenses
Choose a threaded filter by the lens’s exact Ø thread size, or a slip-on filter by the outside diameter of the front barrel or hood.
Binoculars
Matched pairs (one filter per barrel). Both barrels must match OD for a secure, safe fit.
DIY / Custom Build Sheets
ND5 solar filter sheets for building custom front-mounted cells and specialty applications.
New to Solar?
Start here if you’re unsure what you need. Learn sizing, selection, and safe front-mounted use.
Not Sure What You Need?
Most sizing mistakes come from measuring the wrong surface. Slip-on filters fit the outside diameter (OD) at the front mounting surface. Threaded camera filters use the lens’s exact Ø thread marking.
- Telescopes: measure the front tube OD (not the aperture).
- Spotting scopes: measure the front objective housing OD.
- Camera lenses: use the exact Ø thread marking for threaded filters; measure the front barrel or hood OD for slip-on filters.
- Binoculars: measure both front barrel ODs and confirm they match for a standard pair.
Safety Reminder
Inspect your filter before every use. Do not use a damaged filter. Confirm the filter is secure before pointing any optic at the Sun. Review full guidance here: Solar Filter Safety.
