(A) A 2PFM-SCTM adapter on the front of the Custom-Wheel plugs directly into the 2" focuser. This adapter has a flange of only 2mm, and permits a 48mm filter to be screwed infront. On the back is a one-piece adapter, (B) A SCT-T-LR to connect cameras such as Apogee, SBIG, etc, which have a female T-thread on the faceplate. This adapter, has a locking ring to fix at any angle of rotation, is low profile (less than 10mm including lock-ring) and internally has a screw-thread to install a permanently-mounted 1.25" filter (eg (IR-Blocker) A virtually identical adapter SCTM-M42M-LR is available for cameras such as Starlight Xpress, which have a Pentax M42 female thread on the faceplate.
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