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For the experienced viewer who wants to build their own solar scope, Lunt Solar Systems offers this unmounted Energy Rejection Filter (ERF) for use in H-alpha solar filters. Made of Schott RG630 optical filter glass, it is diffraction-limited with IR Cut and a <1/4 wave T wavefront. One side features dielectric IR-blocking coatings while the second side has broadband anti-reflection coatings.