Abbreviation: DC = "Defocus-image Control" (Nikon)
The abbreviations means "Defocus-image Control"
Explanation from Nikon
AF DC-NIKKOR lenses feature exclusive Nikon Defocus-image Control technology. This allows photographers to control the degree of spherical aberration in the foreground or background by rotating the lensī DC ring. This will create a rounded out-of-focus blur that is ideal for portrait photography. No other lenses in the world offer this special technique.
See examples of effected products
|Nikon AF 105mm f/2 D DC|
|Nikon AF 135mm f/2 DC|