*******
** *** *****, **** slight *******, ****, ** scratches *** *********** ******** impact ** ***** ******* at ***** **** ** on, ******** ******* *** blurring ******** ** *** FOV, **** ** ***** issues **** *** ******* during *** ***, ** visible ** *** **** itself.
***** ****** ** ******* when ******** *** ******** domes ** ******* ******* issues, ***** **** **** scratch-free *****/*******, *** ***** should ** ******* ********* to ******* ***** ** of **********.
Warning: ******* ***** ****** *********
**** **** ** *** tests, **** ****** ***** was ******** ** ******* the ************* ****. ***** which *** ******* ** hard ******** ** **** grass *** ****** ** scratched. ***** ****** **** protective ******** ** ***** as **** ** ******** to *** *** ******* damage, *** ******* ***** should ** ********* *********, and ******** ********.
Test *******
** **** * ******* IR ****, *** ********* DS-2CD2542WD-I, ***** ******** ** LEDs ***** *** **** dome ** *** **** (though ********** *********, ***** in *** ** ****** ********** ****), *** ******* *** dome ** ***** *****, prior ** ******** *** retested. * ******** **** cover *** **** *** the ******* ****, ** it ***** *** ** cleaned/repaired.
Significant ** ******* ******
*** ** *** ****** above ************* ******* ***** quality ** ***** **** IR **, ****** *** to *** ******** *********** caused ** ********* ** the ****, ***** ********* IR **** ****** *** lens, **** **** ** debris *** ******* ******** in *** ******'* ***. We **** *** **** FOV ** *** ****** with **** ** ***** issues *****:
*** ********** ***** ***** the ****** ** *******/***** details. **** ****** **** of ***** ****** **** barely ********** ** *** dome ******, *** *** significant ****** ** ********* image *******. **** ******* were *** **** *********. Despite ***** *****/*******, **** degraded *** ***** ******* to *** ***** ** providing **** *********.
Daytime ******* ******
******* ***** ******* *** **** severely impacted, ** **** ***** adding * "***" ******. Even *** ********* **** that *** ******** ** night *** *** **** to ******* ****** ****** / evidence. *** ********* ***** shows *** **** ** moderate ****** ** ****:
Other ****** ******
**** **** ***** ******* may **** ********* ** dome *** ** *********** layout, ****** ** *** tests, *** **** ***** covers **** *** **** and ** **** *** be ******** ** ***** issues. ****** ******* *** turret ***** ***** ***** separate *** ** *********** and **** (*.*.********* **** *.*) *** **** ****** to ** ********.
****
*** ** *** ****** them? **** ** ** the ******** *****.
Comments (22)
Dan Clinton
Great test John! We too have seen quite a bit of this issue, particularly with dirty IR dome cameras. As you mentioned IR Bullets are less suspect - this is because most have a physical barrier that blocks IR LED light from being transmitted through the glass in front of the lens.
With most IR dome cameras no barrier cuts through the actual dome itself. So even with the foam IR rings and rubber gaskets around the lens - IR Light is still transmitted through the thickness of the dome itself.
We have a product that combats this called the IR Shield.
I feel that this is a relevant cross post.
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Jon Dillabaugh
11/28/16 08:41pm
For the dirty domes, can I recommend the DomeCleaner?
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David Johnson
Our location sees salt spray deposited as fine crystals on the dome and has a similar effect as the fine scratches. Turret style devices and bullets work well and have completely replaced outdoor IR Domes for us.
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Lee Zanter
We started applying novus #1 to our domes. Worked well for us. Given only been couple months since we started.
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Tony Lagan
At my time working for Hikvision we found the the 2CD25xx Dome (being a micro dome) was the most susceptible dome in the range for image degradation if there was dust/fingerprints on the poly-carbonate.
Like you stated some domes are impacted differently to others and the standard sized Hik domes while also suffering some performance issues were not as bad as the 2CD25xx range.
Obviously if IR performance is paramount then a turret or bullet are the best options, the main issue here is from what I can see there are not many Vandal Resistant turrets or bullets on the market so if this is a requirement there are not too many other options left unless you use a separate illuminator.
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Blake Murphy
Excellent test, except we find raindrops the most common cause of dirt issues on the domes installed without a wall bracket, it would have been interesting to compare rain drops with the other causes of dirt
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Keith loch
Reminds me of my customer who wasn't happy with the quality of picture he was getting a short time after installation.
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Undisclosed Integrator #2
This is why I prefer turret style cameras,they seem to take a lot more abuse before image degradation.They don't require disassembly during install so no moisture issues. On the other hand they are not the aesthetically pleasant to look at.
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Undisclosed Integrator #3
We almost exclusively use "eyeball style" cameras.
1. For their infinite positioning ability
2. The ring of IR leds is separated from lens and no IR flashback
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Robert Forte
I have found that the turret style cameras don't get as dirty nor do they get a lot of scratches..
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