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Starizona makes this small adapter ring to allow the replacement of the stock focuser on the Lunt LS50 solar telescope with the Borg Helical Focuser S. This focuser is smoother and provides a bit more inward focus travel, but not enough for some cameras. We recommend using a T-to-C adapter in place of the 1.25" female barrel on the Lunt diagonal to attach most video cameras and reach focus.