I also have Dahua 4MP Dual Lens.
Dual Lens is a good idea.
But there are still some flaws.
I am sorry, My English is not that good.
Only use simple pictures to report to everyone.
This is Dahua's ideal Dual Lens.
This is Dahua Real Dual Lens.
Has the same OS04A10 + 3.6mm F1.0
The shooting range of IPC-HFW5442T-ASE-NI will be wider.
And HFW5449T1-ASE-D2 is to crop the non-overlapping area after image fusion.
So the shooting range of HFW5449T1-ASE-D2 will be relatively narrow.
And because the image is enlarged to 2688*1520
So visually it feels a bit unclear.
HFW5442T-ASE-NI 3.6mm
HFW5449T1-ASE-D2 3.6mm
HFW5449T1-ASE-D2 The night color is definitely the best.
Finally, I hope Dahua can refuel to provide better products to you.