Tips for Dahua coaxial and IP systems

M

maguro

n3wb
May 2, 2015
3
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Hi everyone, I'm planning to redo the CCTV system in a house. I already have the old coaxial cables that I'd like to use for 7 cameras, and I'd like to add an IP camera.
My idea was to go with Dahua, specifically the dual-light turret models like the HAC-HDW1239T-IL-A-S2 (2mp) or HAC-HDW1509T-IL-A-S2 (5mp)
I'm actually undecided between these models. I'm worried that, having the same sensor, the 5MP model might be too noisy at night, but I'm also worried that 2MP is a bit low.
What do you recommend?
As for the IP camera, I was considering an IPC-HFW2449T-ZAS-IL to have the varifocal lens, as it's in a more sensitive area.
Let me know your expert opinions.
Thanks
 
Last edited:
Welcome!

You are correct, a higher MP on the same size sensor as a lower MP camera will result in poor night time quality.

With the right focal length, 2MP is sufficient for most.

Most go by this chart. Anything in green is what you want:

1769273948060.png
 
Thte 4MP IP cam you linked has a sensor suitable for a 2MP camera....if you want 4MP, get at least a 1/1.8" sensor, as shown in the above chart. :cool:
 
Thanks so much for the advice. Unfortunately, I'm having a hard time finding 3.6MP on the turret model; I can only find 2.8MP at the moment, but I'll opt for the 2MP solution.
I thought that since it's dual-light with white LEDs, I could go a little higher with the megapixels.

As for the IP cam, what model would you recommend?
It's always better to go bigger with the DVR, getting one that can also handle 5MP in case of a future upgrade, I imagine...
 
The 5442 (54IR) series is the most recommended IP cam.

You need the ideal MP/sensor ratio if you expect low light performance.

There is no 5MP camera on an ideal sensor size.
 
For this configuration therefore: 7 coaxial 2 MP cameras and one IP camera maximum 4/5 MP, possibly calculating a future addition of 2 IP cameras. Which XVR would be right?
 
maguro said:
I'm having a hard time finding 3.6MP on the turret model; I can only find 2.8MP at the moment, but I'll opt for the 2MP solution.
Click to expand...
You're mixing up megapixels with focal length. All 5442 cameras are 4 MP. The different focal lengths, measured in millimeters, determine the field of view of the camera. A 2.8 mm camera has a wider view than a 3.6 mm camera. 2.8 mm gives you a wider view at the expense of lowered resolution. Look at the camera spec sheets, which give you the Field Of View (FOV) for the different lens options.
 
+1 above.

Without knowing what your goals of the camera is, this thread is used as the go to for the new person here outlining the commonly recommended cameras (along with Amazon links) based on distance to IDENTIFY that represent the overall best value/best bang for the buck in terms of price and performance day and night. It might be a 2MP camera in some instances. Many here feel 4MP is the current sweet spot for these cameras.

The Importance of Focal Length over MP in camera selection

And coupled with that thread is this great thread which will show why all of the same 2.8 or 3.6mm cameras is the wrong choice (these are the common focal lengths consumer brands sell):

i-want-2-8mm-cameras-everywhere-to-see-everything-this-is-why-you-need-specific-fovs-with-purposeful-focal-lengths.70053/

We would encourage you to look at those threads in detail.

It will probably raise more questions than answers LOL.
 
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wittaj said:
And coupled with that thread is this great thread which will show why all of the same 2.8 or 3.6mm cameras is the wrong choice
Click to expand...
Agree, yet with the fixed focal PRO, those are the only choices. I've often felt out of sync with the world using 6mm. Long long ago, there were actually some 12mm bullets.
 
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