WebSep 2, 2013 · Many camera lens had radioactive Thorium-232 coatings until mid 1970s. If coating turns brown/yellow tint its easily cleared up with ultraviolet light. Above video radiation test shows 25,000 CPM while normal background radiation is 20 CPM. That can't be good for you. Makes you wonder how radiation didn't expose the film. Webi scored this lovely old camera at a flea market. the lens partly consists of the radioactive element thorium.by adding thorium to the lens glass, a high ref...
Thorium Oxide Lenses Nikonites - Nikon User Community
WebOct 11, 2012 · A Look at the Radioactivity of Old Manual Lenses. Oct 11, 2012. Michael Zhang. Radioactive Lens -- Pentax 50mm f/1.4 S-M-C Takumar. Watch on. YouTube user … Thoriated glass is a glass material used in the manufacture of optical systems, specifically photographic lenses. It is useful to this process due to its high refractive index. Thoriated glass is radioactive due to the inclusion of thorium dioxide, oxide of radioactive element thorium. It has therefore been succeeded as a material of choice by glass including lanthanum oxide. Thoriated glass can contain up to 30% by weight of thorium. The thoriated glass elements in lenses over ti… mswa early bird draw
Canon Fd 2/35mm Chrome Nose Thorium Glass #23406 Concave …
WebJul 19, 2024 · Wide open at f/1.4 the Mamiya Sekor 55mm F/1.4 is a bit soft, even in the center, though not criminally so. Already by f/1.7 (the half-stop click between f/1.4 and f/2) the center sharpens up enormously, and while some chronic pixel-peepers might still find reasons to object, I find it already immensely usable. WebNov 7, 2024 · Nov 6, 2024. #14. reddesert said: IME, digital detectors can be sensitive to radiation events, so if someone who has a known radioactive lens and a CCD digital camera took say a 30-60 second exposure in a dark room with the lens next to the sensor, they might see an increase in hot pixels (so called "cosmic ray" hits). WebMar 2, 2016 · Posted February 29, 2016. A lens called the Summitar* was produced in two batches with serial numbers from 812242 to 812323 and from 812341 to 812360. This … mswa fern river facility