Dahua 8mp Turrets - "low illuminance"

fenderman

fenderman

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Mar 9, 2014
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Dahua has released several 8mp turrets with the 2831 model name, however, they sport the 1/2.7" sensors vs the 1/1.8" sensors in the 2831 bullet cams. Dahua is marketing these cams as "low illuminance". There are two fixed turrets - T and M models (the mounts look different and the T has plastic and metal indicated in the spec, vs all metal on the M, a closer inspection of specs is needed). There is also a varifocal model.
IPC-HDW2831TM-AS-S2

IPC-HDW2831T-ZS-S2

IPC-HDW2831T-AS-S2


 
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Was thinking that the vari might be just what some board members were looking for just bear in mind 15fps @ 4K (not an issue for most), no AI , no SMD and as fender & bigred stated 1/2.7 instead of the 1/1.8 and @ f2. Not dealbreakers for some but worth understanding.
 
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Wildcat_1 said:
Was thinking that the vari might be just what some board members were looking for just bear in mind 15fps @ 4K (not an issue for most), no AI , no SMD and as fender & bigred stated 1/2.7 instead of the 1/1.8 and @ f2. Not dealbreakers for some but worth understanding.
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This new cams can refer to the IPC-HFW2831T-ZS or IPC-HDBW2831R-ZS. They are lite models, good for low budget projects.
 
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But no 1/1.8" Sensor :( At least ipcamtalk community knows how to distinguish good vs bad models. This will be interesting to watch, who will be the guinea pig to test this out? :p
 
Wildcat_1 said:
Was thinking that the vari might be just what some board members were looking for just bear in mind 15fps @ 4K (not an issue for most), no AI , no SMD and as fender & bigred stated 1/2.7 instead of the 1/1.8 and @ f2. Not dealbreakers for some but worth understanding.
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The varifocal is interesting to me. @EMPIRETECANDY feel free to alert me if you get those in stock?
 
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Has anyone tried the IPC-HDW2831T-ZS-S2 I see Andy you have them for sale on your aliexpress site now. How good or bad do you think they are? I may buy one to give it a go as I want something that has better night vision than my OLD dahua 3301 3mp models.
 
David Hunter said:
How good or bad do you think they are?
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I haven't seen a review for that model yet. Its minimum illumination spec is 0.009 Lux.

There wasn't a turret model of the original 2831 series, but the other original models had a min illumination spec of 0.004 Lux (which is better for night vision).

Sharing My Thoughts on My IPC-HFW2831T-ZS Cams After 6 Weeks With Them

I purchased 2 x IPC-HFW2831T-ZS cameras from @EMPIRETECANDY about 6 weeks ago and have had them installed for about 5. I was about to put together a review on these and then heard that @looney2ns may be receiving a unit (after I posted, see that he has in fact now received :) ) and will also be...
ipcamtalk.com ipcamtalk.com

The newer Dahua 4MP models that use the 1/1.8" image sensor have a min illumination spec of 0.002 Lux which seems to be the best for the price range IMO:
Review-OEM 4mp AI Cam IPC-T5442TM-AS Starlight+
 
Thanks for the info the T5442TM is an interesting one. I really like the IPC-HDW2831T-ZS-S2 because of the vari focal and especially the turret shape, but now you point out the sensor size 1/2.7" I am moving away from that. Also just noticed it does not have audio but the fixed focal length HDW2831TM-AS-S2 has audo and the plastic version HDW2831T-AS-S2 but are all still 1/2.7". Then I noticed the HDBW2831R-ZAS a dome camera with the larger 1/1.8" sensor, audio and also 0.004 lux.

I suppose its really what I am trying to improve on, but mainly low light and also car/ face and numberplate reading where possible. I know its pretty much the holy grail that I want for the cheapest amount possible.

Mind you anything will be an improvement over the present ones. Just found the spec sheet for them, see below...

Technical Specifications
Model DH-IPC-HFW3301CP DH-IPC-HFW3301CN
Camera
Image Sensor 1/3” 3Megapixel Aptina CMOS
Effective Pixels 2052(H) x 1536(V)
Scanning System Progressive
Electronic Shutter Speed Auto/Manual, 1/3~1/10000s Auto/Manual, 1/4~1/10000s
Min. Illumination Color: 0. 2Lux/F1.4, B/W: 0.01Lux/F1.4; 0Lux/F1.2(IR on)
S/N Ratio >50dB
Video Output 1 channel, BNC(1.0Vp-p, 75Ω)
Camera Features
Max. IR LEDs Length 20m
Day/Night Auto(ICR)/Color/B/W
Backlight Compensation BLC / HLC / WDR（100dB）
White Balance Auto
Gain Control Auto/Manual
Noise Reduction 3D
Privacy Masking Up to 4 areas
Lens
Focal Length 3~12mm
Max Aperture F1.4
Focus Control Manual
Angle of View H: 91.2°(Wide)~25.5°(Tele)
Lens Type Manual / Auto Iris (DC)
Mount Type Board-in Type
Video
Compression H.264 / MJPEG
Resolution 3.0M(2048×1536) /
 
1/3 cmos generally aren’t good for low light. Forget the low end 8MP cameras For low light and go with the 5442, you’ll be glad you did.
 
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I didn't think it was right to start a new thread and since we're talking about 8MP cameras, is there any indication Dahua is planning to release an eyeball 1831E?
 
If Dahua does make a S2 version of the 1831 I wonder if they’ll use a smaller image sensor like they did with the 2831 S2. Looks like it went from a 1/1.8” sensor (original version) down to a 1/2.7” sensor for the S2 version.
 
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I noticed today the 1831E bullet is marked as discontinued now. I wonder if they're preparing to release an upgrade or something.
 
Interesting. By rule of thumb smaller sensor poorer low light but I have noticed some of the smaller sensors seem to have better low light illuminance. I wonder if the smaller sensors have different tech like BSI sensors in DSLR and mirrorless sensor cameras? Only guessing.
 
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David Hunter said:
By rule of thumb smaller sensor poorer low light but I have noticed some of the smaller sensors seem to have better low light illuminance. I wonder if the smaller sensors have different tech
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Definitely seems like some of the smaller sensors (like 1/3") have been revamped.
 
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