WO Fluorostar FLT98 Fluorite Triplet Apochromat.
http://astronomyalive.com.au/William...cs%20FLT98.htm
Spotted this checking out Astronomy Alives Site.
Very nice. Wish I had the money to buy one - but my money is earmarked that Canon EF 70-200mm f/2.8 L IS USM + front LPF + a EF 2x type II L extender which I'll get more use out of (not just astronomy) when the exchange moves back up a tad).