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Any Dahua cams WITHOUT the focus bug?

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Jeroen1000

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Hi all,

Is anyone aware of Dahua camera's, preferably starlights, that do not have the focus bug?

For those that do not know what the focus bug is:

- When you focus the camera at day time, the night time focus is off after it removes the IR-cut filter.
I.E. the picture loses sharpness (= it is blurrier).
- When you focus the camera at night time, the day time focus is off. So here the picture loses sharpness during day time. Day time = when the IR-cut filter is in front of the camera lens.

So you would have to refocus manually 2 times a day or do it with a script, which is not so ideal. The script can be used to do a refocus or to go to a predefined focal point (=faster). However, the when is a bit harder. Time based is inaccurate and I don't think you can query the camera to tell you whether IR is on or off.

kind regards,
J
 
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weigle2

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Jeroen1000 said:
Hi all,

Is anyone aware of Dahua camera's, preferably starlights, that do not have the focus bug?

For those that do not know what the focus bug is:

- When you focus the camera at day time, the night time focus is off after it removes the IR-cut filter.
I.E. the picture loses sharpness (= it is blurrier).
- When you focus the camera at night time, the day time focus is off. So here the picture loses sharpness during day time. Day time = when the IR-cut filter is in front of the camera lens.

So you would have to refocus manually 2 times a day or do it with a script, which is not so ideal. The script can be used to do a refocus or to go to a predefined focal point (=faster). However, the when is a bit harder. Time based is inaccurate and I don't think you can query the camera to tell you whether IR is on or off.

kind regards,
J
Click to expand...
Since everyone on this forum hasn't reported this as being a problem, I would say it's not generally an issue. From what I have seen only a few have reported this, mostly with the newer ZE series, and some of the PTZ's like the 49225 and 59225. I occassionally have this with my SD49225. But, very rarely. None of my fixed focus cams, 5231's, have any focus issues.
 
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EMPIRETECANDY

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weigle2 said:
Since everyone on this forum hasn't reported this as being a problem, I would say it's not generally an issue. From what I have seen only a few have reported this, mostly with the newer ZE series, and some of the PTZ's like the 49225 and 59225. I occassionally have this with my SD49225. But, very rarely. None of my fixed focus cams, 5231's, have any focus issues.
Click to expand...
I Get some reports for the 8MP ones till now for the Motorized ones of -ZE models and sent the details (S/N, Firmware version) to dahua in a listing for analyzing .i think should be the hardware problem,i checked with some guys who report this to me. For the 2mp one i sold 200pcs now for the new one IPC-HDW5231R-ZE, just 1 client report the focus issue to me, But now i test the higher resolutions cams for 6mp, 8mp or 12mp resolution ones before shipping, and seems ok. Now the problem maybe the firmware problem, but hardware defective maybe the real problem. Hope can get answer soon. I am following up.
 
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Jeroen1000

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I'm in that thread to check my model also (IPC-HFW8231E-Z). Any chance you can get that model listed as well to them? At any rate, for the new ones I want to buy I sent you an e-mail.
 
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EMPIRETECANDY

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Jeroen1000 said:
I'm in that thread to check my model (IPC-HFW8231E-Z). Any chance you can get that model listed as well to them? At any rate, for the new ones I want to buy I sent you an e-mail.
Click to expand...
Please send me the SN No. and with some pics for me, there is no problem if you not buy from us. I can do support for you..kingsecurity2014@163.com thanks.
 
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Jeroen1000

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Andy, I have PM'd you the firmware version I'm running and the serials of the cams.
 
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shokunin

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It's possible that the optics are not IR optimized. IR is a longer wavelength than the visible light spectrum and optics need to be designed with that in mind. Usually there can be backfocus error due to the optics not focusing the IR wavelengths the same manner as the visible spectrum.
 
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Jeroen1000

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Yes correct and that's why it needs to refocus. The optics are probably not IR corrected or sufficiently so.
 
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wxman

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Losing focus on IRC filter position change is not the real problem, as this is perfectly normal...Anytime a filter is added or removed, your focus is going to change. This may or may not be noticeable, depending on how the lens is focused (ie. most fixed-focus cams are set for the hyperfocal length in which there's very little change when filters are added or removed; Varifocal cams can have a much more noticeable focus change. The real problem is the cam not performing an auto-focus after the filter move is complete.

I have other zoom cams that lose focus when the IR filter is added or removed, but these cams always run an auto-focus a few seconds later to clear up the picture...That is, as long as I keep the focus set to "auto focus"....If I turn the focus setting to "manual", these cams go blurry on IR filter change and stay that way until I manually refocus.

For those having the problem, either they are not on the proper autofocus mode or either the script inside the firmware is not properly programmed to run autofocus after the IR filter move is complete.
 
Kawboy12R

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Or they're running the cams to read plates at night and there's nothing to see to do the refocus on 99.9% of the time. The cam needs to be able to save, remember, and repeat the focus on the D/N switch, not refocus from scratch.
 
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Jeroen1000

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I'm still trying to get a fix. I agree a fix should not be particularly hard. After all, I can refocus to a known (saved) value using the CGI. I just don't have a good trigger. The only good trigger is moment when a D/N switch occurs.
 
SkyLake

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I also noticed this issue on my new SD49225T-HN.

Mostly when switching from the ''Night'' (manual focus) to the ''Day'' (semi auto focus) profile. Sometimes, well more than less, i also notice a focus offset when switching from Night (IR cut) to Color mode. Then i need to focus the thing again. Setting auto focus at night is a no go for me at the moment, because the scene changes quite often. So it would focus hunt quite a lot, when it is to dark, and not using the IR's.

The problem also occurs on my SD22204T-GN , but it is quite rare in contrast to the SD49225T-HN.

Dahua should fix the problems much faster, but on the other hand, *sarcasm-on* it still are "lower budget" camera's. So they need to lack some things somewhere *sarcasm-off* :p
 
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fixxxer0

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just started to use B&W on my 8232 and noticed i now have this problem as well.

was there ever any solution found?
 
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aristobrat

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Two work arounds I've seen are (1) put a piece of reflective tape on something near the area you want the camera to focus on or (2) if you have an always on Windows PC, use the free DahuaSunriseSunset tool that one of the admins here wrote... it takes care of switching you cameras between day/night profiles and can set the zoom/focus when it does (with different values for day/night, if you want).
 
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fixxxer0

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aristobrat said:
Two work arounds I've seen are (1) put a piece of reflective tape on something near the area you want the camera to focus on or (2) if you have an always on Windows PC, use the free DahuaSunriseSunset tool that one of the admins here wrote... it takes care of switching you cameras between day/night profiles and can set the zoom/focus when it does (with different values for day/night, if you want).
Click to expand...
is the DahuaSunriseSunset independant of BlueIris? ---- Nevermind I installed it, and yes it is.

I guess what I really wanted to know is if BlueIris has a similar function built in.
 
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aristobrat

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I haven’t seen that functionality directly in BI. There’s probably a way to schedule BI to run a tool like curl to send the same commands that DahuaSunriseSunset does but I haven’t looked too hard at that.
 
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