Although Sun waited until the owls 'eggs were hatched before setting up his equipment, so that the adult birds would not abandon the nest, the flashes of infra-red light emitted by the image intensifier may still startle and disturb the birds and so affect the owlets' rearing.
雖然等小鳥孵出後，孫元勳才架上儀器，以免成鳥拋棄鳥巢，但夜視鏡發出的紅外線閃光，還是可能驚擾鳥兒，影響育雛。