Kenko 400mm F8 mirror lens hood Nikon F-mount for Black 419 649 Incredibly compact Mirror tele lens (Overall Length 82mm) The lens is designed to compact and lightweight for those who need to carry a sub super-telephoto lens and reduce carrying equipments It is possible to shorten the overall length and also it has a lightweight.Silver deposition mirror is adopted The lens has fixed aperture F8 Machined aluminum body Filter size:67mmJapanese Instruction Only