Need a lens recommendation

[Zohan 1]

I need to cover a parking lot and have a good depth of field. The lot is well lit at night.

Will most likely use a Dahua 1.3 mp or 2mp box cam

http://www.dahuasecurity.com/products/ipc-hf5100-387.html

 

I need / want:

varifocal

day / night

possibly aspherical

auto iris

good / great resolution

really good depth of field

 

any suggestions?

 

Thanks