Coronado Etalon Units


Increase surface detail and active regions on the Solar disc.


SolarMax II Double Stacking Etalon with RichView tuning system

Primary H-Alpha etalon filters. These add-on filters reduce the normal bandwidth of a SolarMax 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 filter and blocking filter or complete Coronado telescope.

Include 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.

A Coronado adapter plate is also required to fit the Etalon unit to your existing Coronado solar telescope.

Please note: this filter cannot be used as a stand alone solar filter. Immediate and irreversible eye damage may result.


Coronado Adapter Plates

The Coronado adapter plates are required to double stack the PST and SolarMax external primary Etalon, double stacking an original Coronado or Coronado II telescope. Please select the appropriate size adapter plate for your Coronado telescope.


Models and Prices


Product Code Product Description Opticstar Retail Price
SME-40 SolarMax II 40mm Double Stack Etalon for PST or SolarMax 40 £705.00
SME-60 SolarMax II 60mm Double Stack Etalon for SolarMax 60 £1,055.00
SME-90 SolarMax II 90mm Double Stack Etalon for SolarMax 90 £2,820.00
AP185 40mm adapter plate to fit SME-40 to PST or SolarMax 40 £21.00
AP186 60mm adapter plate to fit SME-60 to SolarMax 60 £21.00
AP190 90mm adapter plate to fit SME-90 to SolarMax 90 £32.50

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