Help!!!! My smoke Sim render is blurry at 1080p

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Hey guys i'm new to houdini i've been playing around in it for 2 weeks now and i created a smoke sim moving toward the camera. I used a box as an emitter and changed the dimensions, basically making it rectangular, then i dropped down a volcano from the shelf tools..i wanted to experiment with that instead of using billowy smoke. I've tried as much as what is within my knowledge of houdini ..which is not a lot to get this sim to not look so blurry. At 640x388 the sim looks good, but at 1080p the sim looks blurry..I've tried playing with the camera settings, i played with the settings in mantra, i turned up the pixels i've tried sharpening in the pyro solver..with just slightly better results. I've included the hip file and a screenshot. i have the full fx version. not apprentice. Can one of you Masters help me? My eyes is glued to this forum for help so i'll respond very quickly

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Screen Shot 2014-09-05 at 6.35.53 AM.png (356.9 KB)
final outward smoke .hip (785.6 KB)

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Your voxel resolution looks quite low. Have you tried lowering the division size of your sim (inside your dopnet on the smoke object)?
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Thank you..I decreased the division..and it's simulating now..I'll post a screen shot of the frame when it's done.
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