CCTVCam
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- Sep 25, 2017
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Yeah but I don't think it's down to sensor size or should that be pixel size on the sensor as the larger sensor on the 4K colour series largely maintains the pixel size given it's 8mp on 1.2 vs 4mp on 1.8. I think the issue is rather more with the relationship between sensor physical size and dof. There appears to be complex arguments between photography experts as to what causes shallow dof with larger sensors with many saying it's not the sensor size but other factors. However, whatever those factors may be, many people seem to observe shallower dof on larger sensors which suggests the ideal move is probably to stop down a little with a larger sensor (or correct whatever complex issue there is that causes the shallower dof effect). It appears on the 4k colour series this didn't happen and the dof was quite shallow.
I actually rather like Steve's suggestion above:
"For me they should take new released in 2024 1/1.2" image sensor from OmniVision, which supports both white and IR and do only 8Mpx line of 7 series with various varifocals (ZE and Z4E minimum).
Latest Ubiquiti G6 PRO bullet showed that this is possible (put 1/1.2" and varifocal in small bullet chassis).
Also HIK is using this sensor in new ultra PTZs...
this way we could have 8mpx cam with super night performance using 1/1.2" sensor and AI-ISP / WizColor video processing.
comparable to performance 4Mpx on 1/1.8" (the same pixel pitch).."
I can't help but feel this may produce a better result, but we'll have to wait and see if we'll all be going Hik if that's what they're planning...could be some interesting testing ahead - Wizcolour Pro vs Hik Ultra.
I should add, I also was never impressed with the lens quality on the 4k series. Pictures never seemed very sharp even on the sweet spot, not compared to the 541R. Maybe lens cost / complexity is one reason why Dahua have stepped down to the 1.8 again, although with so many phones and action cams using 1inch sensors, it's hard to see what the issue is and not question why 1inch and not just 1/1.2 isn't actually available for CCTV at a reasonable price.
I also wish a Dahua factory rep visited these forums and engaged and took on board feedback as I think it would be beneficial to both parties. It's alright thinking many of us are amateurs, which many of us are, although there are pros on here as well. However, you have to ask yourself, how much actual feedback does Dahua get from companies buying CCTV? I think most just have cameras installed and never give feedback as the end users know little of CCTV. They just use the pictures and accept the spiel from the installer that it's the best or best suited. Of those that do give feedback, it probably goes to installers and they never pass it on which potentially leaves Dahua insulated from feedback from end users.
