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I chose this 400mm mirror lens over two other 500mm models because it was the smallest and the build quality seems excellent. This is effectively an 800mm f/8 lens with great macro ability on my Olympus micro four thirds camera.
The potential portability of this lens is what initially made it attractive. When attached to my D70, it is indeed a very light package. I carry it on long bike rides for photographing wildlife I see along the way. It also focuses very close, at a little better than a 1:3 reproduction ratio.