The Hi Topcor lens replaced the UV Topcor line when the IC one with its cloth shutter was developed. Some of the first IC ones had an 50mm UV Topcor lens mounted but soon these were to be replaced. In this line appeared a 50mm 1;2 lens, a 50mm 1:2,8, a 55mm 1:1,8 lens and a special 87-205 mm zoom lens. Also a 2x auto tele converter was made in this series of lenses.
These were produced between 1973 and 1979.