7d Noise Issue

Hi,

I've only recently starting using my 7D, and in general I'm new to my own photography/video (though I work in video editing with Premiere and AE). I bought it primarily to make videos for clients.

I did my first a few weeks ago. And after loading it up I noticed there was a ton of noise. Strange, though I put it down to my inexperience and 'probably the wrong settings somewhere'.

Then on my second shoot with what I believe to be correct settings (I wanted a filmic look, so 24fps, 1/50s, low aperture and tested with highlight tone priority on/off and kept the ISO down as low as possible - either 100 or 160 - though now I know it should be a division of 160 I'll stick with that) it was terrible.

I tried grading it up in Magic Bullet Looks - but my god, everything looks terrible. It looks like things crawling up the wall the noise is so bad.

So I made a short recording just now with it sat on the table. Please take a look at how, at low ISO, the table is 'crawling' with noise. Then as it goes up it moves to the seat and the jacket starts to pattern.

http://youtu.be/Dyvvr-sE5CQ

I guess my question is - is this normal?

I've looked at other tests online and they seem lovely and clean, Im painfully jealous as I thought that's what I would be getting with the 7d, but even photos at low ISO are grainy as hell.

Any advice recommended? I should add its still under warranty, I guess I'm just wanting to see if this is normal or not?

(Canon 7d and Sigma 35mm 1.4)

The first shots look seriously underexposed, and as everyone knows that is a surefire way to get noise. The later Higher ISO's when exposure is better look OK to me. A black coat on a black chair isn't the best of subjects for a video test, unless you are perhaps planning a documentary on coal mines

It really shows when in HD, even at the higher isos

Setup wise I just pointed in a direction that was darker but to me at least it did show up, unless it's normal.