Hikvision 2MP VS 4MP EXIR Turrets

I cannot afford darkfighter but I want a decent day/night image. I need a wide view so I was thinking about going with the 2.8 mm lens vs the 4mm, I know you get less detail but you see more FOV. I was recently dissapointed with some HIK 4MP Domes I picked up, I was getting crazy DNR Ghosting so I had to turn them down to under 50% gain on DNR. I need a recomendation on a HIK Camera that will work well for day and night, will the 4mp Exir still have the DNR gain ghosting issuses and I will have to turn it down again or should I just go with the 2mp exir? Or if someone has a better suggestion please let me know. My 1.3mp old Hik cameras have the best night vision but I don't want to drop that low on the resolution

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