от: Don_Pedro
радиактивен какой-то 50-ый топкор, кажется.
Yashinon 55mm 1:1.2 981nSv/h *
Yashinon-DS 50mm 1:1.4 680nSv/h
Topcon UV Topcor 50mm 1:2 283nSv/h *
Remark I : the mesurement has been carried out directly behind the rear element - result is without substraction of natural radiation (ca. 83nSv/h for most lenses, 64nSv/h for lenses marked with "*" in the comments).
Фон 83/64нСв/н










