This listing is for a Sea & Sea 15mm f/ 1:3.5 lens for Nikonos mount. This lens externally is in very good used condition with minor wear from use. All labels and markings/ etchings are intact. The focusing knob turns smoothly and is marked in feet and meters. The aperture knob turns smoothly and has click stops at 3.5, 5.6, 8, 11, 16, 22. all markings on both adjustment knobs are clear, crisp and legible. Internally the optics are clear and have no signs of fungus, however the front optic has some misting or hazing around the edges the rear optic is clean and clear. The aperture blades are clean and oil free and move freely, because of the type of adjustment that this lens uses the aperture is always stopped down. There are both front and rear lens caps with this lens, the rear one is a Sea & Sea original, the front one is a plastic/ rubber and was split when it was donated, I have taped it on the front and back to stop the split going all the way through. This lens is untested on a camera body as it was donated on its own and so is also not film tested.