Do not use an adjustable or auto-darkening welding helmet to watch the Sun. The American Astronomical Society (AAS) specifically advises against this, even when a helmet offers a dark shade setting. Its guidance distinguishes these helmets from fixed-shade welding filters. Read the AAS welding-filter guidance.
For ordinary direct viewing, choose purpose-made eclipse glasses or a handheld solar viewer that conforms to ISO 12312-2, from a trustworthy supplier. Welding equipment should not be assumed suitable simply because it protects against an arc.
The VIKING 3350 correction
The earlier version of this article incorrectly claimed that the Lincoln Electric VIKING 3350 reaches shade 14 and recommended auto-darkening helmets for eclipse viewing. Those recommendations have been removed.
Lincoln’s VIKING 3350 manual IM10287 specifies a light state of shade 3.5 and variable welding shades 5–13. It describes an arc-activated filter, not a fixed solar-viewing lens. Its separate UV/IR protection specification does not mean the visible-light shade is 16, or that the helmet is approved for watching the Sun. Check the original manual, especially the specifications and helmet-information sections.
What about fixed welding glass?
AAS identifies fixed welding filters of shade 12 or higher as suitable, with shade 13 or 14 generally giving a more comfortable view. That advice does not extend to adjustable helmets. If the filter’s identity, rating, condition or suitability is uncertain, do not use it for solar viewing. AAS explains the distinction.
A practical viewing checklist
- Use a verified solar viewer and follow its instructions. Ordinary sunglasses are unsuitable.
- Inspect it first; discard a damaged viewer. Supervise children.
- Cover your eyes before looking toward the Sun. Turn away before removing the viewer.
- Do not look through binoculars, a telescope or an optical camera viewfinder while wearing eclipse glasses. Magnifying optics need appropriate solar filters secured at the front and expert guidance.
These precautions follow NASA’s eclipse safety guidance. For choosing a supplier, use the AAS solar-viewer supplier resource.
Viewing without looking at the Sun
Pinhole projection is an indirect alternative: stand with your back to the Sun and watch the projected image on a surface. Never look at the Sun through the hole. NASA also explains why an annular or partial eclipse has no unprotected direct-viewing phase; the brief exception during a total eclipse applies only to complete totality within its path. Follow NASA’s phase-specific instructions.
Frequently asked questions
Does the helmet’s test button make it safe?
No. A test button is not a conversion to a fixed solar viewer. On the documented VIKING 3350, releasing the test button returns the filter to its light state. Follow the solar-viewing guidance above.
Is a dark-looking lens proof of protection?
No. An indoor brightness check cannot establish a filter’s spectral performance. Choose equipment with verifiable solar-viewing suitability instead of judging it by appearance.