I don’t know if Mr Rodger’s was shot on film or video, but either way, the flame was glowing in a wavelength the camera couldn’t pick up. Either it was a color that the chemicals in the film don’t react too or it’s not something the electronic sensors were sensitive too. Probably a high frequency violet bordering on ultraviolet. TV cameras are optimized to record the frequencies of light the human eye can see, making allowances for cost & technological capabilities. They may not work the way you’d expect as red fades to infrared or violet goes towards ultraviolet, especially when using 70’s or 80’s TV cameras in the price range of PBS.
I don’t know if Mr Rodger’s was shot on film or video, but either way, the flame was glowing in a wavelength the camera couldn’t pick up. Either it was a color that the chemicals in the film don’t react too or it’s not something the electronic sensors were sensitive too. Probably a high frequency violet bordering on ultraviolet. TV cameras are optimized to record the frequencies of light the human eye can see, making allowances for cost & technological capabilities. They may not work the way you’d expect as red fades to infrared or violet goes towards ultraviolet, especially when using 70’s or 80’s TV cameras in the price range of PBS.