The Russian Zenit Helios 40-2 85mm f/1.5 lens is now available for F-mount. In the past this manual focus lens could be used on Nikon cameras only with an M42 adapter. Here are the specifications:
Head over to Flickr and Fredmiranda for some sample images taken with the Helios 40-2 85mm f/1.5 lens. Check also Photozone’s review of the M42 version of this lens on a Pentax APS-C camera.