Never look at the Sun through binoculars, a telescope or camera without a certified solar filter covering the front of the optics. For direct viewing, use eclipse glasses or viewers that meet ISO 12312-2 from a reputable supplier. Telescopes need a front-mounted white-light filter or a dedicated hydrogen-alpha solar telescope. Cover or remove the finderscope, and never use screw-in eyepiece solar filters.
The Sun is the one object that can permanently damage your eyes in an instant. These rules are not optional.
Safe methods
| Method | Use |
|---|---|
| ISO 12312-2 eclipse glasses or handheld viewer | Direct naked-eye viewing |
| Front-mounted white-light solar filter | Telescopes and binoculars; shows sunspots |
| Hydrogen-alpha solar telescope | Prominences and surface detail |
| Pinhole projection | Indirect viewing with no optics |
Never use
- Sunglasses, smoked glass or exposed film
- Screw-in eyepiece solar filters, which can crack from concentrated heat
- Eclipse glasses held behind binoculars or telescopes
- Unfiltered finderscopes; cover or remove them
Fitting a filter
The filter must cover the full front aperture and attach securely so wind cannot dislodge it. Inspect it for scratches or pinholes before each use.
Buying
Buy from suppliers on the American Astronomical Society’s reputable vendor list, and check the ISO 12312-2 marking on eclipse glasses.
Planning a solar setup? See equatorial vs alt-azimuth mounts for tracking. Browse imaging and observing.
Common questions
Are sunglasses safe for looking at the Sun?
No. Even very dark sunglasses are not safe. Use eclipse glasses that meet ISO 12312-2.
Can I use eclipse glasses with a telescope?
No. Telescopes and binoculars concentrate sunlight and will damage glasses and your eyes. The filter must cover the front of the instrument.
What is a hydrogen-alpha solar telescope?
A dedicated telescope that shows solar prominences and surface detail in a narrow band of red light.
Where can I find safe solar filters?
The American Astronomical Society lists reputable vendors of solar filters and viewers.