NEX-5N with Kenko Tokina 400mm Mirror Lens (600mm EFOV)
Here is the NEX-5N with an E-mount Kenko 400mm Mirror Lens shown at CP Plus in Yokohama, Japan. The lens has a constant f/8 aperture and is manual focus. This compact combination will get you an effective focal view of 600mm. The lens is 4.4" long by Ø3" max. The projected price of the Kenko Tokina 400mm lens is $250.
Kenko Tokina 400mm Mirror Lens Specs
Thanks impress.co.jp and kenko-tokina.co.jp!