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Thanks Adam, this is the blurb for it, sounds like it should fit.
SV193 0.8X Field Flattener improves the signal-to-noise ratio;meet the needs of sufficient exposure in a short time
Designed for use with refractors with focal lengths of 400mm to 660mm and focal ratios of f/5 to f/7.5
One side is a standard 2-inch socket to connect to the main lens;the other side is M48x0.75 threaded to connect to the camera bayonet
3 elements 2 groups lens structure;Fully multi-layer coating;Blackened lens edges;a superior clear image for you
I'll do a bit more research.
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