A fabulous 185-degree Circular Fisheye conversion lens was introduced from Raynox, called DCR-CF187PRO. Once again, Raynox filled the need of advanced image creators. Upon mounting on the zoom lens, it opens the field of view to the ultra wide angle, the diagonal fisheye angle and to the circular fisheye images. A very interesting feature of this particular lens makes it possible to change the scenery from an ultra wide angle view to a diagonal fisheye and to the circular fisheye or the other way, by zooming the lens. DCR-CF187PRO comes with 4-adapter rings for 43mm/ 52mm/ 55mm/ 58mm filter sizes 185-degree Field of View on all directions 4-Group-6-element High Definition Design Shifts Diagonal to Circular Fisheye Image* Four adapter rings included**To achieve a Circular Fish-Eye image, the focal length of the camera"s lens must be about 36mm or shorter (equivalent of 35mm film format). Otherwise, it may not make a complete Circular Fish-Eye image. *There are some cameras you can shoot a Circular Fish-Eye picture but not a Diagonal Fish-Eye image. Video camcorder may not achieve circular fisheye image. **DCR-CF187PRO Upon mounting on the zoom lens, The DCR-CF187PRO opens the field of view to the ultra wide angle, the diagonal fisheye angle and to the circular fisheye images. It"s a completely new high definition lens made of the high index optical coated lens with a 4-group/6-element formula to obtain the maximum resolution power of 500 lines/mm at center (MTF30%), while it has low dispersion. Specifications & Measurements Magnification: Nominal 185-degree, Actual 185-degree Diagonal, 185-degree Horizontal Lens construction: 4-group/6-element, Coated optical glass elements Front Filter thread: None Mounting thread: 62mm Dimension: 98mm x 96mm Weight: 565g(20oz) Accessories 4-adapter ring Lens pouch Lens caps Instruction manuals