HFW3849T1-AS blur unsharp focus in b/w-mode - lens/filter issue?

[ipcflow]

hello community

i have a new dahua IPC HFW3849T1-AS and it work fine in color mode. only in night color mode getting unsharp.

i now found out, that on black-white mode there jump a red-lens as filter before. than the focus is getting unsharp.

usually all is fine and sharp to 10meters in color mode. if i switch to b/w mode (by day or night) the picture go blur and only sharp on near object under 1-2meter.

anyone has the same problem or know a fix?

first i thought it is software bug (because fixed-lens), but later i saw this described above and think its hardware problem. maybe the (red-ir) filter-lens has false position or is damaged or anyway false lens.

thanks for your knowledge and help.

 

[wittaj]

Unfortunately it is probably the camera...

This is active deterrence camera is an 8MP on a 1/2.8" sensor, so it is on a horrible MP/sensor ratio. You cannot have enough light at night for it to perform well.

Even worse, this 8MP is on the same sensor and CPU as a 2MP non TIOC camera and there are many threads here showing how under-performing that 3849 is. They had to limit bitrate and other parameters on the 3849 to try to make it functional, and it just doesn't cut it.

In my opinion the 3849 should not be sold with that current MP/sensor and CPU combination, but alas everybody wants 4k and chases MP over sensor and this camera is the epitome of that thinking.

Further, the red/blue flashing lights are more gimmicky and are certainly not a deterrent. With any ambient light you won't see the red/blue flashing unless you are looking right at the camera.

If you want active deterrence, your best bet is to go with the 2MP IPC-T5241H-AS-PV that will blink the white light. This is on the ideal MP/sensor ratio and will perform comparably to any similar 2MP fixed lens camera by Dahua. I have two of them. I have some of the other active deterrence cams as well, and would opt for the 2MP in every instance except for indoor, one could go with the IPC-HDW3449HP-AS-PV that has the red/blue lights that will bounce off the walls and be much more impressive than outside.

Lot's of threads here where people showed how bad the 3849 camera is in performing:

IPC-HDW3849H-AS-PV issues
I put this guy up and for some reason, and I can put my finger on it, this picture just looks strange. The grass kind of looks like digital or something. The camera is on the default settings but I feel like I have tweaked most of them. Any suggestions? IPC-HDW3849H-AS-PV is the camera.


IPC-HDW3849H-AS-PV loses connection/reboots during the day
I have a IPC-HDW3849H-AS-PV (8MP, Full-color night, 1/2.8” CMOS (3840 × 2160) @20 fps). I also have several IPC-HDW5831R-ZE, IPC-HDW2831T-ZS-S2 , and IPC-HDW4431C-A. The IPC-HDW3849H-AS-PV disconnects and reboots during the day, I have no issues during the night. It's my only cam that has this...


Replaced HDW5442TMP-ASE by HFW3849T1P
Hello everybody! I replaced my favourite camera HDW5442TMP-ASE with new HFW3849T1P and I came accorss that HDW5442TMP-ASE has much better picture than newer one. I replaced it because HFW3849T1P 8MP instead of HDW5442TMP-ASE 5Mp and HFW3849T1P is TIOC (three in one camera). I didn't expect so...


Dahua 8mp (TIOC): Full Colour, Active Deterrence & AI
Dahua 8mp (TIOC): Full Colour, Active Deterrence & AI now for sale in UK. I wish they had the Image Sensor: 1/1.8" and a F1:0 lens as I would be all over this. SPECIFICATION Model Number: IPC-HFW3849T1P-AS-PV-280 CAMERA Image Sensor: 1/2.8" Progressive CMOS Effective Pixels : 3840 x 2160...


IPC-HDW3849H-AS-PV Video Quality
Hi All, I have recently installed Dahua IPC-HDW3849H-AS-PV, 2.8mm (8MP, full color, active deterrence) cameras. The overall video quality is good but I cannot read number plate for cars passing down the road (approx 11 meters away) or identify people properly. Is it the expected behavior? What...

 

[ipcflow]

thank you for this usefull information, i see there are many problems with HDW38xx.
i think the 1/1.8" starlight CMOS would the best option... i do not need the TIOC function, i only bought it because of price and SMD3.0
anyway i think i should better use the HDW5xxx

firmware for the -S3 is also for HDW5xxx same. they use a better hardware chip for S3 version, the old 3849 has other chips.

but anyway the problem i have is not while light is low, the problem is that the focus get changed and unsharp on black-white mode (day or night with good light), it is very strange.

 

[ipcflow]

current MP/sensor and CPU combination, but alas everybody wants 4k and chases MP over sensor

you are right.

i saw this: Worlds First Review - Dahua - IPC-Color4K-X / DH-IPC-HFW5849T1-ASE-LED - Full Color 4K Camera

1/1.2" chip i think this would good solution?
i want to buy this from shop, but do not know if all would be fine with delivery to germany and customs.

has anyone here experience with it for sending to europe/germany.

 

[sebastiantombs]

Best to check directly with Andy.

Email
Andy Wang kingsecurity2014@163.com

 

[wittaj]

you are right.

i saw this: Worlds First Review - Dahua - IPC-Color4K-X / DH-IPC-HFW5849T1-ASE-LED - Full Color 4K Camera

1/1.2" chip i think this would good solution?
i want to buy this from shop, but do not know if all would be fine with delivery to germany and customs.

has anyone here experience with it for sending to europe/germany.

Yes the 4K/X is phenomenal. It doesn't see infrared though, so it needs some ambient light or the white LED on, but other than that it will put the 3849 to shame. Not even close.

 

[ipcflow]

i bought some now think some week it will be there.

anyway.

is it possible to open the camera and do a manual change of the lens focus, so that both mode (day and ir-night) will work?
so maybe day is focus on 7 meters and ir-mode at 3 meters?

or is this physically not possible?

 

[wittaj]

i bought some now think some week it will be there.

anyway.

is it possible to open the camera and do a manual change of the lens focus, so that both mode (day and ir-night) will work?
so maybe day is focus on 7 meters and ir-mode at 3 meters?

or is this physically not possible?

Yes it is actually an easy fix. Do a search here for examples. Basically open it up, break the glue off the thread, adjust for focus.

 

[camsfocus]

Yes it is actually an easy fix. Do a search here for examples. Basically open it up, break the glue off the thread, adjust for focus.

Hi, could you share some tutorial?

 

[wittaj]

This post was for a Hikvision, but the steps are pretty similar, it is a matter of taking off the cover, xacto knife scraping off the glue on the thread and turn in small increments and watch it on a screen.

2CD2387G2-LSU/LU Tear down and refocus (with pictures)

I recently purchased a 2CD2387G2 8MP ColorVu to replace a 2386G2 monitoring the driveway and front yard of my home. After conducting some side-by-side testing with the existing 2CD2386G2 I came to the conclusion the new 2CD2387G2 was not as well focused. Images from the 2CD2387G2 were...

ipcamtalk.com