I suggest we all declare all-out war on flickering in animations. There are frequent requests for help to reduce flickering. So... If the moderators would make this thread a sticky, we could all post antialiasing settings and hints: help all in one place. This thread would NOT be a place to ask for help, it would be a reference list of settings which work for various types of images. To get the ball rolling (but not flickering), I'm working on an animated murder mystery which takes place on a foggy wharf at night. Things that want to flicker are: volumetric atmosphere, horizontal planks of wood for the wharf, soft-edged pools of light from spotlights and vertical rods on a boat and lamp-posts. Using the default "Ultra" settings, the animation flicker was horrible. After a week of 7-hour test renders, here are settings which work for this difficult scene: Load the default "Ultra" into the user settings (using the wee button in the top left of the render Options dialog box) DEselect (UNcheck) "Depth of Field" in the middle column. Make sure that "Optimize volumetric lights" and "Optimize last render pass" in the middle column are DEselected (UNchecked). Click the "EDIT button in the middle column at the bottom next to ""Anti-aliasing". This brings up the AA Options dialog box. Set the following settings: Left side of dialog: Object checked, "Optimized", "automatic" Subrays per pixel= min 4, max 28. DEselect "Regular sub-pixel sampling", Quality threshold = 80%. Right side of dialog: Texture filtering = 100%. Check "Texture antialiasing". UNcheck "Recompute sub-rays". Texels per ray min = 4, max = 30, "Quality Threshold" = 80%. These settings work for the scene I described. Render time for 640x360 pixels was 2.5 hours for 1 second of animation at 30 frames per second. Computer was 4-core Intel MacPro, 6 GB RAM. Note that it is probably possible to tweak these settings to reduce render time without introducing flicker for other scenes. What I suggest is that you may consider using these settings as a starting point, then tweaking. It is important to note that flicker reduction is different for different scenes. For example, in my recent animation "In the Year 2525", some scenes needed only the default "Broadcast" to render flicker-free, while others required "Ultra" and customized settings based on Ultra. Therefore, if you all post your settings here, a reference list of settings which work with specific types of scenes would assist everyone. Happy (flicker-free) rendering!, regards, David