Looks like you're on the right track--you may need to tweak settings after you get some triggers. Keep in mind, 100 pixels is a very short distance in the field of view. There's a post somewhere here graphically illustrating rough pixel distances. Do you mean your 'Object size exceeds 515?' If so, I believe that scale is designed to be set between .1 - 100 percent. There's conflicting understanding about this setting, but I take it to mean that if an object's size exceeds say a setting of 50 percent of the area you've marked for triggers, the motion detection will reset and not alert. This can be useful for lighting changes that set off most of a zone. So the trick is to create a zone or zones much bigger than say the size of a target you want to alert on (animals, humans) and then figure the percentage that would be too large to be human. In that doorway for example with the lighting problem, Make a large zone that a big person can only fill 40 percent of the zone upon detection (set a quick make time of less than half a second) and then set object size exceeds 50 percent. In theory, big lighting changes will trigger 50 percent or more of the zone and simply reset your motion detection. This will require experimentation, especially if you have multiple zones with pass through rules like 'target 1 must either go from zone A to zone B or vice versa' in order to alert (A-B). Or only from zone A to B (A>B). Or must cross A & B before C (AB>C). Fortunately you can set these up and go try them out since they're at your front door. Also, be sure to do the same at night. One thing I can't predict in that bright light is how a person's shadow when entering the field of view is going to affect zone triggering...you'll just have to play with it. You can also have separate settings for the camera with the light problem by assigning each set of settings to a different profile. One profile to be very strict about what gets triggered during the lighting problem and another profile when the light isn't a problem and you can relax your settings with say one zone. If you do this, you can set the cameras schedule independent of your other cameras in camera options. Good luck!