Merit LILIN is an established manufacturer of quality IP surveillance products, and has an extensive array of network cameras available for sale, from inexpensive consumer-level cameras to top-quality professional models.
The LILIN LD2222 and IPD2220 are both dome-type indoor 2 MP cameras with very similar feature sets. They are small and discreet, and can supply 1080p HD video as well as audio via a built-in microphone. Both support Power-over-Ethernet, making them easy to install when using a PoE-enabled switch. The main difference between the two models is the low-light performance: the LD2222 is rated down to 0.6 lux while the IPD2220 is specified to produce useful images at down to 0.2 lux, due to what LILIN calls “Sense UP+” low-light technology. This potentially makes the IPD2220 particularly useful for installation in locations with poor lighting.
Here we are testing the LD2222E4, which has a 4mm lens (there is also a LD2222E2 model available with a 2.8mm lens), and the IPD2220ES2, which has a 2.8mm lens (there is also a IPD2220ES4.3 model available with a 4mm lens). The shorter the focal length the wider the angle of view, however lenses with very short focal lengths (such as 2.8mm) tend to exhibit significant barrel distortion, resulting in a mild fish-eye effect.