Re: Greenish Spots
It is most visible in contrasty lighting with bright point sources like this shot - often they are tungsten lights but the effect is not depedent on that.
It is simply reflections of those bright lights, off the the front of the lens itself, then off the BACK of the IR filter and through the lens to the sensor. Tinted green by the IR filter's absorption at the red end of the spectrum.
With the filter - green reflections.
Without the filter - the guy's hat would go purple.
Take your pick.
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