PE 40mm F/4

The is the widest angle rectilinear PE lens available. There has been careful correction made for distortions often associated with a lens of this focal length. Usages for portraiture include large groups of people and environmental portraits.
 
Lens Construction 8 groups / 9 elements
Angle of View 82.1
F stop range F/4 - 22 (with half stop detents)
Diaphragm Fully Automatic
Minimum Focus Distance 0.35 meters / 13.8 inches
Shutter Seiko #0 (electronic control) plus T (time exposure) & B (bulb)
Filter Size 62mm screw - in type
Lens hood Lens hood E for PE 40/50
Size 50.5mm x 82mm / 2.0in x 3.2in
Weight 510g / 18 oz.
35mm equivalent focal length 24mm