Is my math correct that you can zoom HDV (1440 H x 1080 V) by exactly 225.0% before you begin losing resolution in a DV (720 H x 480 V) project? My math is 1080 / 480 = 2.25 (or 225%, based solely on Vertical lines).
Or do you do the math based on Horizontal lines (1440 vs. 720), which would therefore mean you lose resolution at 200.0% (1440 / 720 = 2.0)?
I think what Eric meant is that if you uncheck Scale to Frame Size for your HDV clips, you can magnify them to a certain degree without losing quality. That degree will be in effect a 100% scale. Only beyond that does quality regrade.