New Fisheye Peleng 3.5/8mm Lens for Pentax K SLR cameras Focal distance, mm 8,1 +/- 0,25; Relative aperture 1:3,5+1:16 Angle of view 180 deg; Aspect ratio, mm 24x36; Minimum distance when photographing, 0.3m Resolution power in the center 55mm, along the edges 15mm; diameter 73mm,length 65,5mm Front and Rear caps, soft pouch included Made in Russia, Brand new, 1 Years International warranty