I'm pretty sure I already know the answer (no), but I thought I would hang it out there to publicly mulled over.
I found this on eBay :
http://www.ebay.com.au/itm/GSO-2-0-5...70040972930229
From what I can tell, it is likely to suit a Newtonian style scope.
Anyone care to disagree? Anyone using one on a larger SCT with great success?
FWIW, the same seller has a x0.63 reducer for SCTs. The x0.5 just piques my interest a little more.