I've been reading reviews and comments on 500mm mirror lenses today. There is, of course, mention of the donut-shaped bokeh for out-of-focus light reflections. However, some folks seem to have mastered the bokeh to the point that backgrounds simply look out of focus as with any other lens. It's not something I've thought about too much, so I'll ask: With such a lens, what would you do to minimize it? What are some of the basic tricks?