How to Select the Right IP Surveillance Camera, Lens, and Resolution

How to Select and Set Up an IP Surveillance Camera

Choosing the right IP surveillance camera involves more than selecting a camera with the highest resolution. The camera, lens, mounting location, and viewing angle all work together to determine whether you capture the details you need.

The goal is simple: install the right camera in the right location so you can clearly see what is important.

Start by Defining Your Objectives

Before selecting a camera, determine exactly what you want to see.

Different locations often require different levels of detail. For example:

• At a building entrance, you may need to identify a person’s face.
• In a parking lot, you may only need to monitor vehicles entering and leaving.
• In a warehouse, you may want to observe activity over a wide area.

Knowing your objective for each location makes it much easier to select the correct camera and lens. Learn more about establishing your objectives by reading our technical note, Defining the Objectives for Your IP Camera System.

Resolution and Field of View Go Together

A camera’s resolution determines how much detail it can capture, while the lens determines how wide an area the camera can view.

These two specifications must be selected together.

A wider field of view covers more area, but spreads the available pixels over a larger scene. As a result, objects become smaller and facial details become more difficult to recognize.

A narrower field of view concentrates the available pixels into a smaller area, providing greater image detail.

Many cameras are available with either:

• Fixed lenses – economical and ideal when the viewing area is known.
• Varifocal lenses – adjustable after installation, allowing the field of view to be fine-tuned.

How Much Resolution Do You Need?

The amount of detail is commonly measured in pixels per foot (pixels/ft.) across the field of view.

The higher the pixel density, the easier it is to identify people.

Typical guidelines are:

• 75–80 pixels/ft. – Identify someone you already know.
• 160–170 pixels/ft. – Forensic identification of an unknown person.
• 180–200 pixels/ft. – High-confidence identification under challenging conditions.

As the field of view becomes wider, a higher-resolution camera is required to maintain the same image quality.

To learn more read our article, What IP Camera Resolution Do You Need?

Calculating the Required Field of View

Once you know the camera resolution and the desired pixels per foot, you can determine the maximum field of view using:

Field of View = Horizontal Camera Resolution ÷ Pixels per Foot

Example

Suppose you want to recognize people you already know and require approximately 80 pixels/ft.

Camera Resolution	Horizontal Pixels	Maximum Field of View
2 MP (1920 × 1080)	1920	24 ft (7.3 m)
5 MP (2592 × 1944)	2592	32.4 ft (9.9 m)
10 MP (3648 × 2752)	3648	45.6 ft (13.9 m)

Higher-resolution cameras allow a wider viewing area while maintaining the same level of facial recognition.

Selecting the Right Lens

The lens determines how far and how wide the viewing area is.

A wide-angle lens covers a large area but provides less detail.

A telephoto lens narrows the field of view, making distant objects appear larger and easier to identify.

A common question is:

“How far can an IP camera see?”

The answer depends on the amount of detail you need. A camera can “see” objects that are miles away, even the moon, but without sufficient pixel density, you won’t be able to recognize faces or read license plates.

The important measurement isn’t distance, it’s whether enough pixels cover the object you want to identify.

You can calculate the distance away you can see a person’s face by using trigonometry. To learn more, see our article Calculating What You Can See With Your IP Camera.

Camera Placement

A site survey helps determine the best camera locations.

When planning camera placement, consider:

• How large an area needs to be monitored?
• Do you need to detect activity or identify faces?
• Will the camera operate during both day and night?
• Will bright backlighting or shadows affect image quality?
• Should the camera trigger alarms or AI analytics?

A simple floor plan showing each camera’s field of view makes it much easier to verify complete coverage before installation. To learn more, see our article, IP Camera System Site Survey.

Final Camera Adjustment

Once the cameras are installed:

• Adjust the lens to frame the desired viewing area.
• Verify that important objects have sufficient pixel density.
• Confirm that lighting conditions provide acceptable image quality during both day and night.
• Fine-tune the camera angle to eliminate blind spots.

Summary of How to Select and Setup The IP Camera

Selecting the best surveillance camera starts with defining what you want to see. Once you know the required level of detail, you can determine the appropriate camera resolution, calculate the required field of view, and choose the correct lens.

By matching the camera, lens, and installation location to your objectives, you can build a surveillance system that provides the image quality needed to recognize faces, monitor activity, and protect your facility.

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If you need help determining the best surveillance camera system for your organization, please get in touch with us at 914-944-3425, email dennis@kintronics.com, or use our contact form.