Good morning, David, Ray, and Lee;
Gentlemen, thank you. I admit that, like Ian Grant and our other friends in Great Britain, I have commonly associated an umbrella with weather. It is surprising to even me that I did not think of the photographic application for an "umbrella;" reflecting and diffusing light.
David, your suggestion for a visit to an artist's supply house is another one that I should have remembered. However, I think that I can be forgiven for my lack of thought in that direction. My former wife was (still is?) an artist, so there might have been some psychological factors at play in repressing memories in that field. I will plan a trip to Daniel Smith's.