Nikon 20mm f/2.8D Ultra Wide Angle AF  

This ultra wide-angle autofocus lens allows for pin-point focusing even in dim light. 94° picture coverage with edge-to-edge sharpness. Tremendous depth of field enables quick shooting. Close-Range Correction for distortion-free pictures as close as 10 inches. No light fall-off even when wide open. Accepts 62mm filters. Wt. 9.2 oz. Dim. 2.6" x 1.7".
Features
Close Range correction (CRC) system provides high performance at both near and far focusing distances
Superb optical design for architecture, wedding and landscape photography
Close-Range Correction for distortion-free pictures as close as 0.85 inches.

Specifications
Construction 9 Groups/ 12 Elements
Angle of view 94°
F stop range 2.8-22
Closest Focusing Distance 10"
Maximum Magnification 1:8.3
Filter Size 62mm
Dimensions (Length x Diameter) 2.7" x 2.7"
Weight 9.5 oz.
Notes Close-Range Correction