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Lunt Solar Filters are NOT centrally obstructed...

Lunt Solar Filters are NOT centrally obstructed…

Lunt Solar do not use central obstruction sun filters for telescopes.. Here are a few reasons why. The challenge to early etalon sun filter making was to figure out how to re-produce a ultra high precision flat on a mass production scale. Typically etalon sun filters required a clear aperture for laser and imaging work….

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