Coronado Solarmax III 60mm H-Alpha Filter with BF30 - 624004

Coronado 60mm SolarMax III H-Alpha Filter
30mm Blocking Filter & Case

The 624004 Coronado SolarMax III Solar Filter Set includes a 60mm 0.7A H-Alpha etalon filter, a 30mm Blocking Filter, for the widest field of view and largest camera sensors without vignetting, and a black & gold hard carry case.

The SolarMax III 60mm etalon includes the popular RichView tuning system, which allows direct tuning of the etalon filter. The RichView tuning system adjusts the distance between the parallel glass plates inside the etalon in order to achieve the perfect wavelength bandpass for the feature you are observing, all while maintaining precise optical alignment. This patented technology also allows the etalon to be used at high altitude observing locations. The RichView system simply allows for better control of contrast over your Ha 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. Combined, the RichView and T-Max together offer unparalleled image tuning to get the best possible view of solar details!

Coronado filters are used around the world 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 allows 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.

The Coronado BF30 is a 30mm right angle diagonal type Hydrogen-alpha blocking filter. It includes a long 2" diameter nosepiece with 1.25" eyepiece holder and 42mm t-thread connection. This blocking filter, which is Coronado's largest available, can be converted to straight-through mode with the included adapter. 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, which is included in this package. The BF30 cannot be used without the etalon in place.

The BF30 is named because of the 30mm clear aperture window that passes the hydrogen-alpha light to the eyepiece or camera sensor. It provides a full disc image of the Sun for telescopes up to 3000mm in focal length. This 30mm blocking filter is a great choice for those who want to use large camera sensors, do high magnification work, or use eyepieces with wider apparent fields of view/.  

Note:  The 60mm H-alpha filter attaches to your telescope with a custom adapter, which is sold separately.  Customers often use a local machine shop to create the adapter (use the etalon drawing in images for thread type, etc.) or you might try precise parts.com.