Thanks. I don't recall the lens length, but at that time I was using the Canon 18-55 kit lens...so 18 is a good guess. The model is my wife; the chair is a blow-up chair I found with luck in a hardware store (!?). The space was my living room, with a white sheet. I did smooth out some wrinkles and stuff in the sheet in post-processing - there were just enough to be distracting.