It depends on what's you need. A good night view and more details on night, that's for the starlight series a good choice, but on day view, you will have less details as with a 4mp one. Next thing is you look on a free field less reflections and therefore you run fast in over light in front of the cams. The SmartIR inside dahuas IR is working mostly good, but the object must move near enough to the cam. To get a view at night for 300m you need really strong ir power and maybe external intelligent IP IR solutions, but this is really expensive. (Raytec
Network Lighting )
Dahua has some more powerful IR versions, but not for this range. Normally you will cover around 30-50m.
Sorry, I just noticed I didn't put the distance as feet except on the little scale.
The map picture I posted has furthest about 200 feet, but I already figured the 2 and 4 MP cameras are good for about 100 - 125 ft (like you said 30 - 50 m). I'll have to settle for a perimeter at about 100 ft with a good view at night.
Why not to buy a ptz with auto tracking? Much more expensive, but there you can see a person in 100m with details. Megapixel is not all you needs. Or a thermal version, which alerts you and switch visible light on for normal cams. What do you do with 14 Cams? All around your building?
Yes If yes, i think this can be better solved.
I would probably run a trench with cable to the end past the driveway and mount another 2 MP camera on a post to catch outside the view of the house mounted camera. Need to keep the cost down.
What should be the desired working distance, when should be a person be identified? Or is it enough to see that there is a person?
After thinking about it, they have to get close if they want to steal anything, so then I can identify them. If I'm at home at night, if the system at least detects movement at 150 ft, it should be enough to give me time to react. Most of the out-buildings are within 125 ft.
Next thing is, although the picture may be bright enough (especially with BLC and 3D Denoise) you runs into blurred pictures, when the objects are moving.
Yep, found that out already..can't expect them to pose for a picture
I use the smaller external ir spots like this ones:
Aliexpress.com : Buy CCTV 6pcs Array LED Illuminator IR Infrared Night Vision Light for CCTV Cameras from Reliable led cellphone suppliers on Shenzhen Ou shi yuan Technology(HK) Co., Ltd
But here the smart IR is not working and in near field its getting to bright.