The simplest answer to this question is that because digital cameras now offer superior image quality, most new security systems greatly favor MP-based cameras over analog TVL security cameras. For example, a camera with a 600 TVL resolution will never match the quality of a 2 ‑megapixel IP camera.
1.3M is generally the smallest resolution of IP megapixel camera, but is still quite a bit larger resolution than any analog cam. Even though this is a huge jump from analog, if this is not enough you can jump to 3.0 megapixel and get a 2048×1536 resolution. Still want bigger? Go with the 5 megapixel for a 2592×1944 for a HUGH image.
4K Security Cameras. 4K, also known as Ultra HD or UHD, boasts a resolution of 3840x2160 pixels, totaling approximately 8.29 million pixels—four times the resolution of 1080p and twice that of 2K. 4K security cameras are perfect for large businesses, public spaces, and properties that require top-notch surveillance.
The camera lenses that CCTV Camera Pros supplies generally range from 2.5mm to 100mm. The larger the size of the lens, the more narrow and zoomed in the field of view is. Some of our fixed lens cameras come standard with a 3.6mm or 6mm lens. If you need precise adjustment to the angle and field of view for your application, a varifocal lens
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The 4-megapixel image has twice the detail of the 1080p image (4 MP vs. 2 MP), meanwhile the cost of 4-megapixel IP cameras is just little higher than 1080p IP cameras. Obviously, many users incline to select 4-megapixel cameras. However, by increasing the image resolution, the required network bandwidth and storage will increase accordingly.
Pls use SATA 3.5" 350G ~ 6TB security hard drive, the capacity depends on your recording needs. Camera Compatibility: [NOTE: All the cameras need to be ONVIF] The resolution should be 2MP or under 2MP for AHD/Analog/TVI/CVI/CVBS Cameras. As for IP Camera, it supports resolution up to 5MP HD. 4 Types for Channel Connection:
Use this video storage calculator / CCTV storage calculator to estimate the amount of hard drive space your security camera DVR / NVR needs. The cctv hdd calculator works for CCTV DVRs and IP camera NVRs. The hard drive space calculation is based on how many days of recording you require, the number of cameras in your system, camera resolution
You can choose between the standard 4mm lens or use the 6 mm or 12 mm. It is all about the options with this model. It is really no surprise that the DS-2CD2032 is regarded as one of the best cameras on the market for security because Hikvision became a leader right out the gate in 2001. What we love about this model:

Most of our commercial customers have sub-1 megabit bandwidth Internet connections to remote locations, which is not fast enough to stream a single 2-megapixel camera. A connection fast enough to support a good viewing and playback experience may cost an extra hundred dollars a month per location.

Required Bandwidth = 1 * 6144 kbps + 1 * 1024 kbps =7168 kbps = 7.168 Mbps. Since the bandwidth calculation of IP cameras would be too overwhelming, you can view the below IP camera bandwidth chart to see the overall Internet speed needed by your security IP cameras.
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So, the conclusion is that you can't identify a person at 30 feet away from a Wyze Cam that has a 2.8mm focal length, 1/2.9" sensor, and 1080p resolution. After playing a little bit with the software it's possible to find out that at 27 feet away from the camera, a person can be identified (It's in the yellow zone now).

CCTV Calculator is a tool designated for camera system basic parameters determination and testing. It enables easy calculation of an appropriate lens focal length, camera viewing angle, IP camera bandwith, storage capacity for records archiving and of other camera system parameters.
Are 2MP security cameras good for surveillance? 2 Megapixel Security Cameras provide a resolution of 1080p that is equivalent to Blu-ray quality. If you are looking for economical HD security cameras, then 2MP surveillance cameras are a good starting point. There are 2 main types of 2MP cameras, i.e. 1080P IP Cameras and 1080P HDCVI Cameras. 2MP PTZ camera SNP-6320H - 32x; 2MP vandal dome - SNV-6013 - fix lens 2.8mm; I can say that i loved the 4K and i found it, in same scenario, even better of the PTZ 2MP 32x. The key is the proper consideration of: distance - lens - resolution. Concentrating 12MP in the proper FOV produce a picture with incredible details. For example, a fixed 2.7mm Starlight turret will have a wider FOV (i.e. you'll get more in the image ), but you can only identify things 13 feet out from the camera. With a 3.6mm, you'd be able to identify things 20 feet out from the camera. As the mm's increase, the distance away from the camera that you can identify things also Comparing 2MP or 1080p Security Cameras with 4MP: 4MP has twice more detail and pixels compared to a Full HD 1080p video. 2MP is high-quality enough for its time. It’s certainly higher resolution than VHS-era tapes that shot at around 480i or 576i resolution. However, technology marches on, and 4MP to 8MP security cams now exist.
Arducam Camera Shield and OV2640 2 MP lens Arduino Cameras ($28.99) Image Credits: Amazon. This Arducam mini module camera features a 2MP sensor. The lens is mounted on a lens holder, hence it can be changed. It has an I2C interface for sensor configuration and SPI interface for camera data.
Get wireless CCTV cameras, CCTV accessories, and more! Best Selling CCTV / IP Camera Products Night Vision PTZ IP Security Camera ₱2,598 5. Dahua 2MP 4MP
Video Transcript. Hi everyone. Mike from CCTV Camera Pros. Here in this video, I’m going to compare the resolution of a 4K IP camera versus a 1080p IP camera. 4K resolution is equivalent to eight megapixel and 1080p is equivalent to two megapixel. 4K is 3840 pixels wide by 2160 high, and 1080p is 1920 wide by 1080 high, so 4K resolution is twice as wide and twice as tall as 1080p.
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