Zenzanon PG 50mm F/4.5
This is the widest angle lens available for the GS-1. Distortions common with wide angle lenses have been corrected and supurb contrast and color saturation are consistently rendered.
 
Lens Construction 8 groups /11 elements
Angle of View 83
F stop range f 4.5 - f 64 (with 1/2 stop detents)
Diaphragm Fully Automatic
Minimum Focus Distance 0.5m / 20 inches
Shutter Seiko #0
Filter Size 95mm
Lens hood built in
Size 74mm x 98mm / 2.9 in x 3.9 in
Weight 790g / 31.1 oz.
35mm equivalent focal length 25mm