Hi Greg, I know you have had many coversations with Andrey of Astreya. I bought a 130 F7 SuperApo lens a couple of years ago and built my own OTA now mounted on a G11 with WO ED80 guide scope. Modified cooled Astro 40D and QHY5 guider. However been looking for Astreya forums etc. Last talk was of Andrey making Pretzval designs but their web site has not been updated since 2009 and some web pages still say they are being re-constructed - is Astreya still in business or has Andrey stopped/moved to the US or joined Lzos. regards Mike in the UK