It’s a telescope. It’s a precision magnification tool. It’s excellent for field observation work like bird-watching or amateur surveying. It’s Nikon’s first Lens scope Converter and, like all Nikon fine optical products, it’s a high quality accurate instrument that will give you years of excellent service. Used with manual focus Nikkor and AF lenses Types D & E for Nikon SLR and DSLR cameras, it transforms your lens into a telescope with magnification that’s 1/10 the focal length of the lens in use. The image you see at the centre of the focusing screen when the lens is attached to a camera is big -approximately 10 millimetres in diameter; details show up sharp and clear. Colours are natural and true to life, because Nikon made sure all chromatic aberrations are corrected. For convenient focusing, the Nikon Lens scope Converter provides a convenient dioptry adjustment ring, with easy adjustments from – 5 to + 3 dioptres.