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Despite its moderately slow lens speed at f/3.5, the Non-Ai 20mm lens has quite a large dimension and weighs equally heavy at 350g. It also has a larger 72mmUsed Nikon 20mm f/4 AI Manual Focus Wide Angle Lens F. Item Note: Heavy dust and haze in rear element; Image quality may be affected; Aperture is stiff; Nikon Nikkor 20mm F4 AI Manual Focus Wide Angle Prime F Lens. Used Condition: VG VG-O. SKU: 800657933 - VSN: NA. $199.99. Only 1 left in stock. Add to cart. Infinity focus is optimum just shy of the stop - using the hard stop works, but not optimum. All stops are useable but fall-off and edge