Vixen Quick Release Clamp Set with...
FLI Research Grade H-beta 5.8 nm square 65mm filter
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FL-RG 65S Hb5.8
AR: Durable AR coatings on both exterior surfaces over applicable transmission range
Scratch Dig: 60/40 or better (max scratch width 0.006mm, max dig 0.40mm)
Transmitted wavefront @ 633nm: Better than 0.25 wave/inch
Wedge: Better than 30 arcsec
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FLI Research Grade filter sets are...