Blinking noise on animation I created Christmas tree using this tutorial (http://www.blenderguru.com/tutorials/how-to-make-a-christmas-tree/). In a words it uses Sapling Add-on(3-level tree) and Hair particle system using 900k emission number, and shaded with this node scheme:


Then I created simple "Rotation" keyframes, which rotates camera around the tree, but from frame to frame the noise looks like its blinking, here is the  first 10 frames animated in gif:



What is wrong?
Thanks for all comments, the reason was in rendering noise. By default it was only 10 Samples for render (Properties -&gt; Render -&gt; Sampling -&gt; Samples -&gt; Render), Now I use 200 samples and Hair particular System looks perfect! But after changing this option each frame  rendering time increased in several times, so you should not increase Samples count too much.