Years ago, photographer Markus Hofstaetter purchased a 140mm f/1.0 lens designed for projectors. He recently found the right opportunity to pair this unusual lens with an ultra-large format camera.
, optics coated in thorium emit about 0.01 millirem per hour. The average person receives about 620 mrems annually from natural and artificial sources, so thorium-coated lenses are radioactive but not dangerous, at least not for reasons concerning radioactivity.
Hofstaetter’s super-fast lens is hazardous for a different reason. It focuses sunlight through it tightly enough to easily set objects aflame. It’s best to keep the lens cap on when the lens isn’t in use.
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