Video noise even at low ISOs?

I'm new to dslr film making.

I have the Nikon d7000, and the kit lens 18-105 mm.

Even when I film at iso 160, the video is VERY noisy.

There's noise on the whole image, particularly the shadows. I have no idea what is wrong, I have tried various different combinations of ISO/ shutter speed/ aperture and I get the same results.

I'm filming in 1080p, 24 frames per second.

I have included an example of video at ISO 320, aperture f 3.5 and shutter speed 50. This is around the least noisy footage I can get and there's noise in the shadows, particularly under the desk in the example. Please help, how do I over come this noise? Is it a case of in camera settings or merely just the light in the scene? I'm also using an IR filter (HOYA HMC uv 67mm), but its hardly relevant.

Please help me over come this noise, and any good sources for introductions to dslr film making are greatly appreciated.

I think you are overly critical. I watched the video full screen on my 24" monitor and found no distracting noise.

I googled "dslr video tutorials for beginners" and got lots of hits.

It's a still camera… With video capability… If you want great fantastic video… Then… Why didn't you invest in a proper video camera or decent camcorder?

Personally, i'd be happy with that level of performance… You will get grain in low light it's the nature of the 'beast' i'm afraid… If you don't want grain… Then invest in a video light to brighten up the shadows…

It's kinda sensible to research something before buying it… Sorry… I don't have much sympathy for people that buy anything and then find out it isn't up to doing what they wanted… It says a lot more about the person that bought the item… Than the actual item.

"I'm new to dslr film making."

Here is an important first lesson: whenever possible, make the level of light in your scene suitable for your camera, not the other way around. Unless you are outdoors during the day, you will often need additional continuous lighting when shooting video. If you can't control the amount of light in the scene, you will have to accept the additional noise from higher gain/ISO.

There will also be some artifacts due to the compression applied by the video codec, something that is practically unavoidable when shooting with digital equipment.

As Phil says, don't get caught up in such minor details. Your viewers will not be as critical of noise in shadows under the sink, unless that is all you give them to look at. As long as your subject is in clear view and worthy of attention, nothing else will matter.

Personally, I'm put off more by the dust on your lens than the noise in the scene.