Check out the listing for Sankor 16D in the Lens-cyclopedia for info. If you search these forums for 'Sankor 16D' you will no doubt find a lot of useful info! Redstan is an option, excellent quality but pricey, Jim Chang just posted about his new Rapido Technology products, and I myself have been playing around with finderscope rings. Normally used for telescopes, less precision, but sturdy and affordable if you dig around for a good deal.
Vincenzo Limone Cataldo reacted to Tito Ferradans in Anamorphnoob