Image circle of 295mm, more than enough for coverage with 4x5 or 5x7(maybe even whole plate). My research shows this lens was made by Nikon for Wista, Comes mounted on a Wista Copal-1 Press shutter(the norm for Wista lenses) Speeds are accurate, no oil on the blades, it's clean and crisp. Second cable release socket for Wista auto shutter close when a film holder is inserted into the camera. There is a preview lever that opens the shutter. Speeds are B, 1-125, aperture marked 5.6-64, retaining ring is included. Lenses are very clean, no haze, fungus, or scratches, minimal dust. Comes with original metal screw in front and rear caps, filter size 67mm. Original box and paperwork included.