(A) A 2PFM-SCTM (2" push-fit male to SCT male) adapter is on the front of the Custom-Wheel, with a (B) 48mm filter screwed in position. (C) A SCTM-M-LR adapter , which is a SCT male-male coupler with lock ring, connects a large format CCD camera, LISAA guider or other device which has a female 2" SCT thread, where rotational adjustement is required. This adapter can mount a permanent 48mm filter. The back-focus required is around 8-10mm. If smaller back-focus is required, then use the non-locking-ring version SCTM-M adapter
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