Solar Education & News

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ND5 filter
safe solar viewing
Seymour Solar
solar activity
sunspots
white light filter

Solar photograph showing multiple sunspots on the Sun’s surface – captured safely through a white-light solar filter tested to ISO 12312-2 transmission limits.

What Are Sunspots — and Why They Matter

Sunspots are magnetic storms on the Sun’s surface that reveal our star’s changing activity. Discover what causes them, what they mean, and how to observe them safely with ND5 white-light solar filt...