manual focus and zooming
 

I use Canon Vixia HF200, and I straggle with manual focus adjustment. It's possible to do it using the joystick, but very difficult, because it can't be done in small increments.

I'm wondering if it would be practical/possible to set the zoom to telephoto, adjust the focus, and then zoom it out as required.
The question is, is the focusing preserved while zooming? Anybody has tested it?

The method you describe is the only way to maintain focus and is an industry standard.
Zoom in ALL the way, set focus and zoom out to your required frame. If you only half zoomed in and set the focus, it would not be maintained at any other zoom setting...

thanks, are you saying HF200 complies with this industry standard?

I meant an industry standard way of working - and, yes, your camera will hold focus on what you choose to focus on, as long as you zoom all the way in to do it and then zoom out to the selected size...
What is sometimes better to do is to use the auto focus function when you're zoomed it, allow it to focus and then switch to manual. It will then hold on that setting after having zoomed back.

thanks. I guess I could test it myself just for fun, but it's not easy to do it in a convincing way. I could probably zoom on a fence positioned at 45 deg angle to the lens axis, and then unzoom and see if the focus is preserved.