Daystar

DayStar Filters has been crafting research‑grade solar optics since 1973. Today, the Missouri‑based team combines ultra‑narrow Fabry–Pérot etalons with modern electronics to bring hydrogen‑alpha and calcium K views within reach of every explorer—from educators to eclipse chasers.

Why Choose DayStar?

• Ultra‑Narrow Passbands — 0.2–0.8 Å filters resolve chromosphere fibrils, prominences and flares in vivid contrast.
• Built‑In Thermo‑Tuning — micro‑chip heating holds the etalon within ±0.1 °C for rock‑steady 656.28 nm alignment.
• Plug‑and‑Play Quark — the all‑in‑one “eyepiece” turns any f/4–f/9 refractor into a safe solar scope—no ERF needed below 80 mm.
• Dedicated Solar Scopes — Solar Scout 60 mm & 80 mm refractors deliver doublestack‑like contrast in a grab‑and‑go rig.