Thanks for the answers. I believe the compendium hood is too "fiddly" for me. I did order a 105-250 hood from the virginia vendor on the Bay, and received it yesterday. It was then I discovered it is for the ETRSi and does not fit the S lenses. (Anybody need a 105-250 hood for ETRSi??) I have the S hood for the 80mm lens, but think it might vignette, since I can see the edges of the hood when looking through the wide open 150mm lens. I also have the proper hood for the 50mm lens, and it seems to be OK on the 150. I guess I will continue to search for the proper hood.
This is my first post here, after lurking for some time. I find APUG a helpful place. Thanks!
Jack - in New Mexico