The two "black on black" stamps difficult to see and one very difficult to see unless viewed obliquely with artificial light, e.g., torchlight. Impossible to photograph clearly with visible light.
Very clearly visible on IR camera's monitor (& in viewfinder) when illuminated with near-coaxial IR light beam using the IR illuminator.
IR 720nm beam not visible to the naked eye – but is visible to camera's 720nm sensitive sensor.
Lens used with 720nm 'PASS' filter which excludes all other wavelengths. Filter is opaque to the human eye.
720nm penetrates the clock's discoloured/hazy acrylic glass.
Camera's custom white balance setting used and the DNG (RAW) IR image processed as monochrome
Thanks Dunk
When you look long into an abyss, the abyss looks long into you.........
Originally Posted by sundial
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