I have a ST-7 modular mount for the Stilletto Series IV focuser that I don't need anymore. This is the mount only...not the focuser body. This has the 180lpi ronchi grating screen in it. Richard sells this new for $115 + shipping. If you have one of Stellar Technologies focusers for your film camera, this would make a great addition for your SBIG digital camera. You can check with Richard at Stellar but I think this is the same mount for the ST-8 as well. $85 shipped in CONUS.