Well Rob, I would have a look if I could ... just spent the last half-hour trying to get my headphones working + still no joy
I don't bother with speakers, just headphones, but haven't used them yet on my new pc. So I plugged them in + I can hear the test ding-dongs, but no sound from music + no sound from your video
Anyway I feel sure we can all say "Didn't he do well"
Frances, I did set out the answer to your DoF question in my gallery, where you asked me, but this comment was one that was swallowed up by the new server
I did say I'd re-do it today for you, so here's how I get a long DoF in a field of flowers like in my "Out of the Earth" pic which you commented on:
Wide angle lens - your 18mm is fine.
Small aperture f/22
Hyperfocal focusing. Now this can be tricky to get the hang of, so all I do is :
1. Frame up the shot.
2. Take a meter reading for the exposure + lock that value in.
3. Take note of what's lying at the bottom edge of the frame.
4. Point the camera to that part of the scene + lock the focus on it.
5. Reframe + shoot.
That way, you know the foreground will be in sharp focus + you should get front-to-back sharp focus.
Simple but effective
HTH.
PS There are other factors which affect DoF, but that's about it for a field of flowers. For portraits, other things like distance from camera to subject and from subject to background affect whether the background is in sharp focus or is blurred, but for landscapes, I find the above method works well.