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Daystar Filters' Q3RFCTM Rear Combo Plate mounts to the rear (red) side of their Quantum solar filters and features a combination thread system that has standard Schmidt-Cassegrain male visual-back threads on the outside and female T-threads on the inside. This combination thread system allows you to attach visual backs, eyepiece drawtubes, or cameras directly to your Quantum. The Combo plate is compatible with the Daystar RF2D2 and GF2SCTT snouts.