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Nikon
500mm f/8 Reflex-NIKKOR
Telephoto Mirror Lens
The 500mm f/8 Reflex-NIKKOR from Nikon is a compact, lightweight telephoto mirror lens designed based on a principal developed for astronomical telescopes. Featuring a clear front and two mirrors - a big mirror in the back and a little mirror on the back of the clear front element - light comes in and bounces off the big rear mirror towards the little mirror. From there the light is bounced back to the film through a hole in the big rear mirror. This reduces the size of the lens, and makes it a great choice for use as a telescope when combined with the Lens Scope Converter since it has great central definition and little chromatic aberration.