CYCLOPS 2.5 deep space lens system. sold by B.E. MEYERS+CO. in late seventies. all you need is a 35mm camera and t ring to attach to the units "T" thread focuser. F/2.5, 7.5" F.L. ajustable iris diaphram to F/16. only 95.00 for this wide angle high speed lens, shipped free in 48 states.