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You’re about to look at the Sun. On purpose.

Most people never do this.

If you’re here, you’re already curious. That’s enough to get started.

START HERE

I KNOW MY SIZE I’M NOT SURE — HELP ME MEASURE

Threaded camera filters use the exact Ø thread size marked on the lens. Slip-on telescope, spotting-scope, camera, and binocular filters use outside diameter.

Measure once. Order confidently.

For slip-on filters, the only number that matters is the outer diameter of the front of your equipment.

Threaded camera filters use the thread size (Ømm) instead.

That’s it. No math. No guesswork.

Need help measuring? See the step-by-step sizing guide.

Telescope

The most common setup.

Slip-on filters mount to the front of the tube, not the eyepiece.

If you’ve got a telescope, measuring the outer diameter is all you need.

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Binoculars

Yes—you can use binoculars.

Slip-on filters are sold in pairs, and the same sizing rule applies.

Measure both front barrels and confirm the outside diameters match for a standard pair.

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Camera lens

There are two options, depending on the filter type.

Threaded filters use the thread size (Ømm).
Slip-on filters use the outer diameter of the front of the lens.

Both are amazing. The method of attachment is just different.

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Glass or thin-film? It depends how you’ll use it.

Glass filters are durable and stable. They’re built for frequent use, outreach, and gear that gets handled a lot.

Thin-film filters are lightweight and lower cost. They’re easy to travel with and excellent for eclipses and casual observing.

Same safety. Same view. Just different trade-offs.

Standards like ISO 12312-2 apply to solar viewing eyewear for unaided, direct viewing and not to optical solar filters used on telescopes, binoculars, or cameras. We explain this distinction in more detail on our ISO 12312-2 scope page.

Sunspots visible on the Sun through a white-light solar filter.

What’s worth looking for

  • Sunspots and evolving surface detail
  • Planetary transits across the solar disk
  • Partial, annular, and total eclipses
  • Day-to-day solar activity that actually changes

Eclipses are only the beginning.

Ready to choose a filter?

If you’ve got your measurement, choose your device and filter type.

Shop by Device

Choose threaded camera filters by exact Ø thread size, or slip-on filters by outside diameter.

Handcrafted solar filters for real white-light observing.

Made by hand in North Carolina.

Built for people who actually want to see what’s happening up there.