Hi all,
New here so please be gentle :D
Been looking at these for a while https://www.amazon.co.uk/gp/aw/d/B017C4YXZO/ref=mp_s_a_1_2?qid=1462726229&sr=8-2&pi=SY200_QL40&keywords=hikvision+turret&dpPl=1&dpID=419VWF-XPFL&ref=plSrch
Obviously they do multiple lenses ranging from 2.8 to 4mm...