This T-2 Mount adaper allows you to mount all your T/T2 Mount lenses and accessories on your Nikon SLR DSLR Camera's. The AF doesn't function but it allows to keep the infinity focus ! . Simply screw it on the bayonet of your Nikon Mount Camera. It easily fits its Nikon F F2 Nikkormat F3 FM2 FM FM-3A FE FE-2 F4 F5 F6 D100 D70 D1 etc. And then you can use your T-Mount Accessory on it.