The Quantum SE grade series are designed for most amateur and some academic applications. These filters meet the critical DayStar quality control criteria applicable in all visual and some photographic environments.
The Blocking Filter is the second element in any Coronado H-Alpha system, it is just as crucial to your safety and the system's performance as the front element. If you are switching to a longer focal length telescope your SolarMax system you can purchase blocking filters separately. The BF-10 to be used on telescopes with a focal length <1000mm. The blocking filter is not a stand alone filter.
The 5mm BF-15 is to be used on telescopes with a focal length up to 500mm. The Blocking Filter is not a stand alone filter. It is an integral part of the Coronado design and cannot be used without a SolarMax series filter on the front of the optical system.