The Tokina 500mm f/8 can now be ordered from B&H Photo. It was announced last month. Microlenses are very light and portable and they will allow a photographer to carry around a lot of reach in a small package. The only real downside to a mirror lens is donut bokeh, which can be offensive or distracting to some. I personally own 3 mirror lenses because I really like how well they perform for such a low price.
