What is the benefit of using the Hikvision DS-2CD2342WD-I turret camera over a dome camera like the DS-2CD2142FWD-I which has the same specs but is vandal resistant?
Is it just for aesthetic reasons?
We get asked this question and variants thereof quite frequently. Traditionally, CCTV has been all about dome and bullet cameras, and turret / eyeball / flat-faced dome cameras haven’t been quite as commonly installed. Now however we tend to recommend Hikvision’s DS-2CD2342WD-I EXIR turret camera for most applications that don’t require a vandal resistant dome, such as when the camera is going be mounted out of reach.
This is due to the fact that the turret camera is what is named by Hikvision as an EXIR camera, which is to say that the camera’s built-in IR LEDs are housed in a separate window to the camera lens and are rectangular-shaped, utilising Hikvision’s patented EXIR technology (hence the name!).
The camera lens is in the left-hand window in the below image, and the EXIR LEDs are in the right window.
This helps to eliminate a number of inherent problems with more traditional integrated IR seen in many cameras.
- No IR Reflection or Bleeding
Having the IR LEDs housed independently from the camera lens completely eliminates the chance of internal IR reflection and IR bleeding which can be a problem with dome cameras in particular. A curved, reflective glass dome cover can inevitably reflect the IR back and blind the camera which we’ve covered before, and an EXIR camera doesn’t suffer from this, allowing Hikvision to install stronger EXIR LEDs with no risk.
- Better IR Coverage
Traditionally, IR has been integrated in a circular array of many LEDs around the lens. This brought with it the common problem of a circular overexposed area in the centre of the image, with the corners being underexposed due to an uneven IR coverage. The rectangular EXIR LEDs provide a much more even coverage across the entire image, eliminating this issue.
- Fewer Issues with Spiders / Insects
Spiders and other insects are typically attracted to the warmer IR LEDs which in a non-EXIR camera would often lead to them sitting in front of the camera lens. This is less of an issue with EXIR cameras, and on the DS-2CD2342WD-I there is also fewer places for spiders to anchor to (flat-faced).
Whilst we do like to recommend the above-mentioned turret cameras, Hikvision produce many EXIR cameras (DS-2CD2T42WD-I5/8, DS-2CD4A25FWD-I etc.), and we like to recommend them over a non-EXIR version wherever possible.