This Sigma APO 500mm f/4.5 EX is an Apochromatic ultra-telephoto lens with a fast f/4.5 maximum aperture, and it incorporates two Extraordinary Low Dispersion glass elements to reduce chromatic aberration to a minimum. Internal focus enables responsive and fast autofocus speed. A rotatable drop-in filter holder in the rear part of the lens barrel facilitates the use of filters including a polarizing filter.
NOTE: HSM lenses, while able to manually focus with all Nikon F-mount cameras, will autofocus ONLY with the following cameras- N65, N70/F70, N80/F80, N90s/F90x, F4, F4s, F5, F100, D1 & D1x. This is the same limitation of Nikon's own AF-S lenses.
- Powerful and silent Hyper Sonic Motor enables fulltime manual focus override