Coronado SolarMax II H-Alpha Double Stacking Etalon Solar Filter (40mm)

Coronado by Meade SolarMax II 40mm Double Stacking Etalon with RichView tuning system. 40mm diameter primary H-Alpha etalon filter. This add on filter reduces the normal bandwidth of a SolarMax 40 telescope or filter set from the single stack .7A performance to a more restrictive .5A, increasing visibility of surface detail and active regions on the Solar disc. Must be combined with a primary SolarMax 40 filter and blocking filter, complete Coronado SolarMax 40 telescope, or a PST telescope. Included patented RichView tuning assembly allows direct tuning of the primary filter etalon. No other commercially available Ha telescope can provide the tuning range and accuracy of the SolarMax II. Now you can tune for the highest contrast views of active regions, filaments and surface detail, or quickly and easily re-tune for prominences on the solar limb. This filter cannot be used as a stand alone filter, primary and blocking filters required.