Now I see that the fault is with the selectivity of the S&T search engine. A search using "eyepeice" with various modifiers failed to turn-up even one of my own articles, Feb. 00, on home-made eyepieces! Here again is demonstrated one of the failings of Web searches; sometimes only an exact search term will get you what you want. I'm still a firm believer in the superiority of good old fashioned book and library research. In my own case, a few hours of Web searching still falls fall short of 30 years of legwork. The huge number of errors I find on personal Webpages also undercuts any faith in Web research. Get thee to a library! I'll continue looking through my back issues as time permits, but there are over 700 issues to check. Stay tuned. C. __________________________________________________ Do you Yahoo!? Yahoo! Shopping - Send Flowers for Valentine's Day http://shopping.yahoo.com