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The Fisheye-Nikkor actually sees a full 180 degree hemisphere: everything in front, above, below, to either side - all around. And it records this hemisphere on the film as a circular image 23mm in diameter. Because of the physical depth of this lens, the camera mirror must be locked in 'up' position, thus making the reflex finder inoperative. Instead, a 160 degree optical finder is mounted on the camera for viewing. Note: When used with a Photomic-equipped Nikon F, the Photomic system must be removed. There is no need nor provision for focusing because of the extreme depth-of-field of the lens (20 inches to infinity at full aperture). And because of its extreme angle, it cannot be used with a lens hood. The Fisheye-Nikkor has 6 built-in filters; Skylight L1A, Medium Yellow, Deep Yellow, Orange, Red and Light Green. * weight: 12 1/4oz.