All that blue light is the refractive index of the glass varying with the wavelength of the light, which makes the coloured fringes .
A bit of coating on the lens would get rid of that, or some better glass- LOL
All that blue light is the refractive index of the glass varying with the wavelength of the light, which makes the coloured fringes .
A bit of coating on the lens would get rid of that, or some better glass- LOL