With the BenQ, you can see how the background lightens when the credits are up. This type of visible shifting of the image due to iris action is not an issue with the HC3800. The trade-off - the HC3800 doesn't quite match the black level performance of most projectors with a dynamic iris. Before you ask, yes the second pair (W6000) are more overexposed, which was done to make it easier to see the difference between the blacks with and without credits on the projector with the dynamic iris. BTW, do not use these images to equate the black levels of the two projectors, the frames taken with the HC3800 were done without signficant overexposure, unlike the W6000 images.