Do we abide by this law?
The optics we use have improved vastly over the years to such an extent that it could be possible we could fall foul of this law.
Does anyone give it a second thought to look at their watch before the trigger is squeezed?
Its very unlikely anything could ever be proved, but the law is the law.
Most optics companies now advertise the low light transmission and light gathering capabilities of their optics, and most of us own them don't we?
Just a thought.