TRENDnet TV-IP341PI Technical Bulletin - Foggy Dome - Page 1

Technical Bulletin Foggy Dome The most severe case of IR Reflection is caused by the FOAM RING not being firmly pressed against the camera dome. This will create a "CIRCULAR FOG" effect (Figure 3). Figure 3 Normal Foam Ring After installation, the nighttime image of a dome camera may appear to be "Foggy"or soft looking. (Figure 1). Figure 1 Foam Ring Loose‐contact This is caused by IR Reflection/Bleeding into the lens. The IR light may be reflecting off the surface of the dome cover or nearby objects. The possible causes for the IR reflection are listed in Figure 2. Figure 2 Loose contact between the foam sponge ring and the dome cover, or missing foam ring Nearby barriers in the environment reflect IR light Dust and / or grease on the dome cover Interfering IR light leaking into the lens causing whitened or foggy image Foam Ring Removed