cosina yes i know it says opteka but they were made by cosina and sold with a number of different names, near mint condition, apeture is fast and snappy, Zoom and focus is smooth, 100-400mm f4.5-6.7 autofocus lens only used a very few times, so in perfect working order, for nikon afd fitting for film and early digital cameras, comes with front and back caps and lenshood. please see my other photo kit for sale
eBay