I have a 16:9 TV screen. The Dish 622 has format options: zoom, partial zoom, stretch, normal. The Direct TV HR20 receiver has format options: Pillar Box, Stretch, Crop, normal. Is the Crop option the same as Dish's partial zoom? Direct TV states that the crop option cuts off the top and bottom of a 4:3 frame keeping the 4:3 ration intact. I think the crop is the same as Dish's Zoom but my friend disagrees.