cableguy2020
n3wb
I have a dumb question, but why would a 4mp cam be better than an 8mp? I'm just curios.
Thanks!
IPC-HDW3849H-AS-PV-PRO review
- Thread starter DanSan
- Start date
Thanks!
It's a tradeoff between daylight and low light capability. In daylight, I consider the 8MP to be better because it gives you clearer details and more digital zoom usefulness. In low light conditions the 4MP camera excels because its larger individual pixels capture more of the incoming light. I don't like to speak for others, but I believe that most of the forum members have decided for themselves that the increase in low light performance is more valuable than the details lost during the day.
bigredfish
Known around here
^^^^
This
Yes, generally speaking, in daytime the 4K will provide a cleaner image, but by and large any $50 camera can provide a good daytime image.
Most of us are more concerned about nighttime image and getting good ID in low light is much much harder. Most bad things happen at night .
All things being equal, a 4MP on the same size sensor as a 4K will let in more light (bigger pixels) and perform better at night.
Now if you can light up the scene with high powered floods, and use the onboard white LEDs all night, the 4K can indeed work and produce a good image. It’s all about light.
Also as mentioned earlier in this thread, don’t be fooled by a bright colorful static image at night. The real test is a human passing in front of the camera. Bad guys rarely stop for 5 seconds to stare into the camera to assure you get a nice clean image with no movement. Once movement is introduced, you often see that bright pretty image become worthless as there is so much motion blur as to make ID impossible. We see that a lot with stickup cheap WiFi cameras.
This
Yes, generally speaking, in daytime the 4K will provide a cleaner image, but by and large any $50 camera can provide a good daytime image.
Most of us are more concerned about nighttime image and getting good ID in low light is much much harder. Most bad things happen at night .
All things being equal, a 4MP on the same size sensor as a 4K will let in more light (bigger pixels) and perform better at night.
Now if you can light up the scene with high powered floods, and use the onboard white LEDs all night, the 4K can indeed work and produce a good image. It’s all about light.
Also as mentioned earlier in this thread, don’t be fooled by a bright colorful static image at night. The real test is a human passing in front of the camera. Bad guys rarely stop for 5 seconds to stare into the camera to assure you get a nice clean image with no movement. Once movement is introduced, you often see that bright pretty image become worthless as there is so much motion blur as to make ID impossible. We see that a lot with stickup cheap WiFi cameras.
To add to the above, if you are going to be in low light conditions, it is critical to get ideal MP/sensor ratios and the 3849 and 3449 are on the same size sensor, which can also mean that the higher MP camera could potentially now be on an undersized processor.
We saw that with the previous generation demonstrating how difficult the 3849 camera is. Here is a thread of a person just a few months ago on the 3849 being burned on them.
And then these are a few of the threads made be people coming here because the 3849 camera was underwhelming.
IPC-HDW3849H-AS-PV issues
IPC-HDW3849H-AS-PV loses connection/reboots during the day
Replaced HDW5442TMP-ASE by HFW3849T1P
Dahua 8mp (TIOC): Full Colour, Active Deterrence & AI
IPC-HDW3849H-AS-PV Video Quality
The biggest problem with the previous generation 3849 camera is it was put on sensor designed for 2MP, so it needed 4 times as much light as the 2MP to produce the same brightness. And because they shoved 8MP on a sensor designed for 2MP, the sensor/cpu is undersized for 8MP.
At least they upsized the sensor in this next PRO generation, but it would still need double the light of the 4MP to produce the same image brightness. This could be the difference between the camera being able to run in color or not.
If you care about low light performance, you need a camera in green below for the MP/sensor ratio.
We saw that with the previous generation demonstrating how difficult the 3849 camera is. Here is a thread of a person just a few months ago on the 3849 being burned on them.
And then these are a few of the threads made be people coming here because the 3849 camera was underwhelming.
IPC-HDW3849H-AS-PV issues
IPC-HDW3849H-AS-PV loses connection/reboots during the day
Replaced HDW5442TMP-ASE by HFW3849T1P
Dahua 8mp (TIOC): Full Colour, Active Deterrence & AI
IPC-HDW3849H-AS-PV Video Quality
The biggest problem with the previous generation 3849 camera is it was put on sensor designed for 2MP, so it needed 4 times as much light as the 2MP to produce the same brightness. And because they shoved 8MP on a sensor designed for 2MP, the sensor/cpu is undersized for 8MP.
At least they upsized the sensor in this next PRO generation, but it would still need double the light of the 4MP to produce the same image brightness. This could be the difference between the camera being able to run in color or not.
If you care about low light performance, you need a camera in green below for the MP/sensor ratio.
cableguy2020
n3wb
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cableguy2020
n3wb
Thank you all for such detail information, newer doesn't always mean better!