help with video

[elsa hoffmann]

I am doing small video clips for my Touring website - but hit a snag yesterday.
Let me start by saying I am not a videographer - and have never been particularly keep on video - in my opinion the D800 could have been without this.
But - I have found a use for it - which I think will add value to my website.

So - i did a couple of clips - and some of them had an issue - it looks like the lens is breathing in and out - only on some clips...
I set up the camera on a tripod with a decent head - so there is no change of it slipping or creeping.
I only press the video button and didnt touch the set up - only the panning leaver

If you are so inclined - please check this 8 seconds clip I uploaded to youtube so you can see what I mean (clipped short so you can see the issue)

ANY help will be appreciated please

https://www.youtube.com/watch?v=h_jNlVS4ukg&feature=youtu.be

(I dont know how to embed it here - therefor the link

[Bjørn Rørslett]

Turn off AF.

This must be Kalk Bay?

[elsa hoffmann]

Thanks Bjørn - and yes - it was Kalk Bay

got me a nice clip of the seal playing too

https://www.youtube.com/watch?v=WhPA4mXXGUM  - 23 secs

[Peter Connan]

Definitely AF working when it shouldn't.

Video and timelapse tend to be the only situations in which I use the hyperfocal theory.

[Anthony]

Thanks Bjørn - and yes - it was Kalk Bay

got me a nice clip of the seal playing too

https://www.youtube.com/watch?v=WhPA4mXXGUM  - 23 secs

Nice, but I think it is a sea lion - it has visible ears, and non-seal type flippers.