Thank you again... You are a font of knowledge (and my ignorance shows). While we're on the subject... Waiting for clear skies, light winds, and bright light in the Pacific NW at this time of year is futile... figure about May. I have the room in the house to do up to my 70-200 f/2.8 but I am wondering about lighting. I have a couple of conventional aluminum reflectors and was wondering if conventional floods would work or if one of the GE "Sun Spectrum" lights would be better. My wife will be pleased to know that I am going to take over the family room ( I have a clear shot down the hall) to mount the target and lights... again,while we have a lot of windows in the room... too grey now to allow enough light for the EF that is required. We don't tan here... the color you see is moss.