Pentax X-5 video zoom help wanted
I also have a X-5 and like it a lot.
You are correct. The zoom lever, while recording video, is digital only and only if "digital zoom" box is checked in the REC MODE menu. Before starting the recording, you can position the optical zoom anywhere from 1.0X to 26X. After starting, you can only zoom in with digital from 1.0X to 7.2X and back out to 1.0x.
Plus, your zoom display will show the total magnification. For example, If you start recording at 2.0X optical, then zoom all the way in, the display will show 14.4X (2.0X times 7.2X = 14.4X).
I hope that helps.
OBTW, I don't know how you would start a shot zoomed in, then pull out. I guess you would have to edit out the first zoom in.