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Jramosent - Dome's really need to be covered as your seeing. Rain will cause a lot of problems during the storm, and water spots will cause programs after the storm. If you vertically mount the dome to the wall as high as possible (without causing IR reflection) so its under the eve you prob will be okay. The HIK 3mp is one of the noisiest sensors in there line currently, I believe some of your picture can be cleaned up with some setting adjustments, but its going to take some playing with the noise/gain and some lighting adjustments to dial it in more.
Also are those screen shots/save as images or are those actual captures/export from the nvr/browser? The sizing appears small when I attempt to view full resolution. What are the cameras running at? *the rain drop images appear to be actual exports as there sizing looks correct, but the images of the driveway do not.