What makes it blurry is my tendency to overuse the depth-of-field effect. Don't confuse the gauss filter in Poser with the gauss filter in Photoshop: FireFly's filter work on subpixel level and are the deluxe version of Poser 4' "Antialias" checkbox. Filtering is a necessity in every sampling process (and rendering is a sampling process) which is why you will find similar controls in almost every decent renderer.