About this product

Coronado SolarMax III 90mm Richview Solar and Blocking Filter

This Coronado SolarMax III 90mm Solar Filter set with RichView tuning system includes a 90mm diameter primary Hydrogen-alpha etalon filter with sub 0.7 angstrom bandwidth and is available with a 15mm or 30mm blocking filter. The filter set is packed in a hard case to protect your investment.

This Coronado SolarMax III 90mm Solar Filter set with RichView tuning system includes a 90mm diameter primary Hydrogen-alpha etalon filter with sub 0.7 angstrom bandwidth and 30mm Blocking Filter. The filter set is packed in a hard case to protect your investment.

The 90mm etalon includes Meade’s patented RichView tuning, allowing direct etalon filter tuning. The RichView tuning system adjusts the distance between the etalon’s parallel glass plates to achieve the perfect wavelength bandpass for the feature you are observing while maintaining precise optical alignment. Coronado’s patented technology allows the etalon to be used at high-altitude observing locations. The RichView system enables better control over your H-a bandpass window. In addition to RichView tuning, the included T-Max Tuner allows you to tune in the brightest image and remove any internal reflections. The RichView and T-Max combined offer unparalleled image tuning to get the best possible view of solar details!

The kit also includes a Coronado 15mm right angle Hydrogen-alpha blocking filter, now in the SolarMax III design. This updated design includes a long 2″ diameter nosepiece with a 1.25″ eyepiece holder and a T-thread connection. The blocking filter is the second element in any Coronado H-alpha system and is just as crucial to your safety and the system’s performance as the primary SolarMax etalon filter. This blocking filter CANNOT be used without a SolarMax etalon. This is a secondary interference filter for full disc image of the Sun for telescopes up to 1,500mm focal length. It can also be used with 1.25″ focusers by purchasing the Coronado 1.25″ adapter #624018. The BF15 provides a larger unvignetted field of view than the smaller BF10 model.

Blocking Filter

Coronado filters are used worldwide by serious solar enthusiasts and professional research facilities alike. When properly and safely mounted on your high-quality refractor or other suitable telescope, this filter set enables observation and imaging of the amazing and ever-changing surface detail and prominences on the Sun in hydrogen-alpha light. Not for use on truss-tube telescopes with open sides as unfiltered sunlight may be transmitted through the optical tube. Custom mounting of the etalon to your optical tube will be required. End-users will be required to contract a third-party company to machine any necessary adapters (adapters not included).

The stunning bright red views through a Coronado Ha telescope display astounding surface and limb detail. Features such as prominence, filaments, plages, and surface granulation are fascinating to observe, and many of these features can change shape over days, or even hours in the case of flares and edge prominences.

Designed and Manufactured in North America.

Features

• Hydrogen-alpha filter set including the 60mm SolarMax III Etalon with 10mm,15mm or 30mm Blocking filter (BF)
• Narrow 0.7 Angstrom bandpass and includes Coronado’s patented RichView tuning system, coupled with the T-Max Tuner to maximise the contrast and detail of the features being observed
• External front-mounted etalon for use on your high-quality telescope
• Includes padded hard case to protect your investment

Note: Requires a third-party adapter to connect etalon to the front of your scope.