"Therefore, that would seem to call for two spearate renders out of Poser because I would have to believe that if I rendered out of Poser once at 1920x1080, 'downsizing' to 720x480 would produce mathematical garbage" Yes, it would. Here's some presets I just grabbed out of 3dsMax that (might) help you decide. Or, might confuse you even more. ;-) HDTV: 1920x1080 (optimal) 1280x720 490x270 320x180 (Image Aspect: 1.77778; Pixel Aspect: 1.0; Aperture Width (mm): 20.120) NTSC DV: 720x480 360x240 300x200 (Image Aspect: 1.35000; Pixel Aspect: 0.9000; Aperture Width (mm): 20.120) 512x341 (Image Aspect: 1.35132; Pixel Aspect: 0.9000; Aperture Width (mm): 20.120)

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Tools :  3dsmax 2015, Daz Studio 4.6, PoserPro 2012, Blender v2.74

System: Pentium QuadCore i7, under Win 8, GeForce GTX 780 / 2GB GPU.