Kenko has announced that their new Kenko 400mm f/8 Mirror Lens will be released on February 03, 2012.
This is a compact, lightweight (12 oz, 340g), full frame, manual focus, telephoto lens with a fixed f/8 aperture (no aperture blades).
And according to Google Translate, "Boasts a unique Ringuboke." "Ringuboke", that's fun to say. Does this refer to the donut hole bokeh mirror lenses are known for? (confirmed correct)
The mirror is coated with silver deposition. "... We achieved a good balance between size-conscious design and performance." Specifications
Focal length: 400mm
Brightness: F8 (fixed)
Lens Construction: Six Group 2
Angle of view: 6 ° 8 '
Filter Size: 67mm
Minimum focusing distance: 1.15m
Maximum magnification: 1:2.5
Focus Mode: Transfer to the front lens manual focus mode
Aperture blades: Without
Mount: Using T-mount (factory fitted)
Compatible Mount: Nikon F, Canon EF, alpha Sony, Pentax K
Suggested retail price: Open B&H
carries Kenko products