All the pics here were grabbed from the video recorded on Blue Iris using this config
If you zoom in though you see a huge difference between the Hikvision
Night vision is not bad. Note the plane in the upper right corner.
though the you are not going to get much detail at 50 feet without extra illumination on a moonless night.
Foscam FI9804 and the $40 SV3C I had next to each other for evaluation. Note the Foscam is picking up some IR bounce back from the fence in front and below it even though the fence is not in the picture.
Inside it looks like this
It is hard to make out but this lens is glued in place making it impossible to swap out.