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How Do I Know My Lens Focal Length? Finding the focal length of a specific camera lens is easy, and is typically printed directly on the barrel of the lens for ...

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Additionally, we can see more details in the face of the person holding the sign through the 4.0mm lens camera. If you don’t need to cover a large area, purchasing a 4.0mm lens security could be a good choice!

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Next, we have the varifocal lens type. When a security camera with a varifocal lens type is chosen, the focal length can be adjusted to capture the angle of choice. Most commonly these will be either 2.8-12mm or 2.7-13.5mm lenses.

In the security industry today, there are two common lens types used: Fixed Lens and Varifocal Lens. For fixed lenses, you will often find them in two common varieties; 2.8mm and 4.0mm. In this case, the amount of mm is referring to the focal length of the camera lens. A shorter focal length (2.8mm) results in a wider angle shot, while a longer focal length (4.0mm) results in a narrower shot.

Varifocal lenses permit users to change the effective focal length (EFL) and the horizontal angle of view. This flexibility allows camera installations in a variety of places that often require lenses of different focal lengths.

If you’ve ever wondered what the difference was between a 2.8 and 4mm lens, I hope your curiosity was satisfied by our demonstration. Overall, it’s about a 20% difference in viewing angle and image quality between the two lens types.

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Next, we took a photo from the 4.0mm lens dome camera for comparison. The camera quality is just as sharp as before, however, now we are covering a smaller angle. This camera is able to cover about six parking spots.

These are standard fixed lens domes with an IP67 rating for outdoor weather resistance and LightHunter technology for excellent image quality in low light environments. In terms of lens focal length and viewing angle, here is how the two cameras compare:

For suggestions on which lens type to purchase for your project or other related inquiries please contact XLR Security via email at info@xlrsecurity.com or call us at 905-794-5508. We look forward to helping you with any security-related business or activities!

To demonstrate the difference between a 2.8mm vs a 4.0mm lens, we installed two cameras in front of our office. The cameras we chose to install were Uniview’s 5MP LightHunter dome cameras: IPC325SB-DF28K-I0 & IPC325SB-DF40K-I0.

First, we have a snapshot from the 2.8mm lens camera for our reference. The camera quality is sharp, the colours are vivid, and the angle is wide enough to completely cover eight parking spaces.

Finally, we compared the level of detail in the two shots by enlarging the snapshots and comparing them side-by-side. There is definitely a noticeable increase in fine details from the 4.0mm lens camera. You can almost read “www.uniview.com” from the poster on the right side, while on the left side it’s completely obscured.

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