I have a question regarding the aspect ration of HDTV. It was always my understanding that HDTV was native 16:9. Here's why I am confused. I have a Pioneer Elite RPTV and Sony DVD player. I spent a fair bit of time understanding exactly what each screen mode on the TV does. The mode called "Full" would stretch the frame horizontally to fill the 16:9 screen. This was the appropriate mode for any widescreen anamorphic DVD. The other modes zoomed the frame for non-anamorphic letterboxed frames that were native 4:3, so when zoomed, filled the 16:9 screen nicely. And of course, the Natural Wide mode which does a bit of zomming and a bit of stretching for a best fit for NTSC 4:3 TV frames. Now the confusion. I recently bought an HDTV decoder for local cable. When I have a true HDTV signal feedign the TV via component input, the TV automatically locks to Full mode (I can't change). At first, this seemd to make sense. But when I thought about it, since Full mode stretchs the frame, is it also stretching this HDTV frame? I thought HDTV was native 16:9 so all the TV would have to do is display it, with no stretching or zooming. What gives?? Thanks.