They can, its just the cheap HD cameras had tiny sensors. The smaller the sensor, deeper the depth of field (therefore less blurry) The canon 5d mkii has a bi

They can, its just the cheap HD cameras had tiny sensors. The smaller the sensor, deeper the depth of field (therefore less blurry) The canon 5d mkii has a bigger sensor that the RED one, and therefore is capable of blurry DoF. http://www.bobatkins.com/photography/tutorials/crop_sensor_cameras_and_lenses.html http://www.bobatkins.com/photography/tutorials/crop_sensor_c...