@Parley, so there's a setting in the NVR web page for the ratio format of the Liveview, which also seems to do the playback ratio. You can set "Auto Fill" (current setting that stretches it), 16:9 or 4:3. So I can have 4:3 and get two cameras right, 16:9 and the others okay and "Auto Fill" might as well just be called 16:9- that's basically what it seems to do! I need to check what effect it has on the NVR HDMI output now that I've left it in 4:3. I haven't found any settings on the NVR itself.
Some good news the DS-2CD2335FWD-I 3MP Ultra Low Light 6mm seems to have good focus across the lens. Some screen captures below- night shots as normal but with a wet road and some low cloud. I need to check settings and see what bit rate is best:
6mm day
6mm at night- set auto switch to night and IR if lights fail
The 4mm has been moved and works very well in it's new position.
Previous Hik DS-2CD2342FWD-I 4MP 2.8mm at night other end of house (1/25th locked in colour, 10 Watt LED flood light from above.)
Same conditions with DS-2CD2335WFD-I 3MP 4mm Ultra Low Light - set to auto day/ night 1/25th
DS-2CD2335WFD-I 3MP 4mm Ultra Low Light day time
DS-2CD2335WFD-I 3MP 4mm Ultra Low Light with all LED floods lights off, auto switched to night with inbuilt IR on.
IPC-HDW5231R-Z 2MP Starlight re-aimed and zoomed in a bit closer to cover the car. Pushing it's limits in colour and the IR just washes out big time (still in same location under eaves.)