Camera boxes shout numbers: 2K, 4K, 12MP. What they don't tell you is the one thing that matters when something happens on your property: how far away the camera can still show a face clearly enough to recognise someone, or a licence plate clearly enough to read it. This guide turns those megapixel numbers into feet, so you can pick the right camera for each spot around a Reno home or business instead of paying for resolution you don't need, or missing the detail you do.
Megapixels in plain numbers
A security camera's picture is a grid of pixels. What decides how much detail you get at a distance is mostly the number of pixels across the picture, because that is what gets spread over the width of your yard or driveway.
| Camera | Pixels (wide × tall) | Picture shape |
|---|---|---|
| 1080p (2MP) | 1920 × 1080 | 16:9, wide |
| 2K (4MP) | 2560 × 1440 | 16:9, wide |
| 4K (8MP) | 3840 × 2160 | 16:9, wide |
| 12MP | about 4000 × 3000 | 4:3, taller |
Notice that 12MP is barely wider than 4K. Most of its extra pixels go into height. That is useful in some places and pointless in others, which is why 12MP is not simply "better 4K".
How far each camera can see: the distance table
Installers measure detail in pixels per foot: how many pixels land on each foot of the scene. A common rule of thumb is about 40 pixels per foot to recognise a face and about 80 pixels per foot to read fine detail such as a licence plate. The table below works those out for a typical home camera with a wide, roughly 100-degree lens.
| Camera | Recognise a face up to | Read a plate up to |
|---|---|---|
| 1080p (2MP) | about 20 ft | about 10 ft |
| 2K (4MP) | about 27 ft | about 13 ft |
| 4K (8MP) | about 40 ft | about 20 ft |
| 12MP | about 42 ft | about 21 ft |
These are planning numbers, not promises. A narrower lens sees farther but covers less width; lighting, focus, weather and how fast someone moves all change the result. They are still the most useful way to compare cameras, and far more honest than a megapixel number on its own.
Which resolution for which spot
- Front door and porch: visitors come within 10 to 15 feet, so 2K usually shows faces clearly. A 12MP camera can help here too, because its taller picture catches someone's face and a package on the step in one view.
- Driveway and street: cars and people are often 25 to 40 feet away. This is where 4K earns its price, especially if you want a plate.
- Back yard and side gates: wide spaces with long walks. 4K, or a 2K camera placed closer to the gate, so the person passes within its face range.
- Storefronts, lots and warehouses: long distances and tall doorways. 4K for distance, 12MP for tall entrances and loading doors.
- Indoors: rooms are rarely more than 20 feet deep, so 2K is normally enough.
Placement often beats resolution. A 2K camera mounted where people walk toward it captures a better face than a 4K camera looking down from across the yard. Our guide to planning camera coverage goes through placement spot by spot.
The night-time trade-off
More megapixels on the same small sensor means each pixel is smaller and gathers less light. That is why a cheap high-megapixel camera can look grainier after dark than a well-made 2K camera. At night, the sensor, the lens and the lighting matter as much as the resolution, and a camera with a built-in spotlight that switches on when it sees a person gives a colour picture where a dark corner would only give grey shapes. If your night picture is already poor, our article on fixing a bad night picture covers the usual causes.
Reno adds one more thing: strong, low winter sun and snow glare. A camera facing a bright street or a sunny driveway needs good wide dynamic range (WDR) so faces in shadow aren't lost against the bright background. Ask about WDR as well as megapixels.
Storage: what higher resolution costs you
More pixels make bigger video files. A 4K camera has twice the pixels of a 2K camera, so at the same settings it needs roughly twice the storage to keep the same number of days of recording. Modern compression (H.265) and recording on motion or person detection instead of all day both help a lot. When you plan a system, decide how many days of footage you want to keep and size the storage for the higher-resolution cameras first.
How we choose cameras for a Reno property
We don't put the same camera on every corner. On a free visit we look at how far each view needs to reach, where people actually walk, what the light does at different times of day, and how long you want to keep footage. Then each spot gets the resolution it needs: 2K where it is enough, 4K where distance matters, 12MP where a tall view helps. Details are on our security camera installation in Reno page.
Frequently Asked Questions
How far can a 2K security camera recognise a face? +
With a typical wide 100-degree home camera lens, a 2K (4MP) camera can usually recognise a face out to about 25 to 27 feet. A 4K (8MP) camera with the same lens reaches about 40 feet.
Is a 4K security camera worth it over 2K for a home? +
For a front door or porch, where people come within 15 feet, 2K is usually enough. For a long driveway, a wide yard or anywhere you want to read a licence plate 20 or more feet away, 4K is worth it.
Is a 12MP security camera better than 4K? +
Not for distance. Most 12MP cameras are about as wide in pixels as 4K (around 4,000) but taller, because the picture is 4:3 instead of 16:9. That extra height helps for doorways, tall entries and storefronts, not for seeing farther.
Do higher-megapixel cameras look worse at night? +
They can. Packing more pixels onto the same small sensor means each pixel gathers less light, so a cheap high-megapixel camera can look noisier at night than a good 2K one. Sensor size, the lens and the lighting matter as much as the megapixel number.
Does Kiwi Alarms install 2K, 4K and 12MP cameras in Reno? +
Yes. Kiwi Alarms installs 2K, 4K and 12MP security cameras for homes and businesses in Reno, Sparks and Carson City, and matches the resolution to each spot instead of using one camera everywhere.