Bower 500mm f/6.3 Manual Focus Telephoto Lens for Nikon

The Bower 500mm f/6.3 Manual Focus Lens is a catadioptric mirror T-mount lens, delivered in this configuration with a T-mount for the Nikon F-mount cameras.  This lens is precision manufactured in South Korea.

When combined with the T-mount, this mirror lens mounts to any Nikon F-mount camera and works on both FX "full frame" cameras as well as the "APS-C" style DX digital SLR cameras.  However, the fixed f/6.3 aperture is not communicated to the camera body.  As such, you can use the lens in "M" manual exposure mode, or "A" aperture-priority mode upon certain cameras.

This lens has a broad diameter and stocky build, making it a bit easier to handle than a normal refractor lens.  It also has a much different rendering of out of focus areas than a normal lens; highlights will be doughnut-shaped rings with more saturation and contrast on the edge of the ring than on the center.

This lens is an ideal candidate for astrophotography use when mounted to a Vixen GP2 Photo Guider (or other motorized equatorial telescope mount).