Bushnell 400mm f6.3 lens. This is an M42 screw mount lens manual focus lens. The lens functions perfectly & the glass is clear with no issues but only a little dust that is normal with a lens of this age. The lens is made in Japan, and I have shot with it adapted to a Fuji XE2 camera with no issues. It has a tripod mount built in however, it is missing a lock down hand screw to lock it in place. I just have not taken the time to find one that fits it, but I am sure it can be found. The lens has its own lens hood built in. It comes with the original metal front cap & a plastic rear cap. The filter size is 72mm. I think it is a great lens for adapting to a mirrorless camera like a Fuji X camera to give you a 400 X 1.5 = 600mm field of view f/6.3 lens. It’s a great bargain way to see if you would like to invest in a more expensive long lens. It was a cheap off brand lens back in its day so don’t expect great image quality, but it can get you a nice image if you are patient. Here is an alligator I shot with this lens in Florida without a tripod.