Soligor brand, Tokina made 90-230mm f4.5 lens together with Vivitar brand, Tokina made lens tripler. This lens is the Pentax M42 Universal thread mount. Effective focal length is about 700mm at about f9. See photos with tripler added and second photo with two triplers stacked, making an effective 2100mm lens at f16. Do this yourself. Lens and one tripler for sale.