How Far Can a Security Camera Actually See at Night?
A security camera's useful night range is a fraction of the advertised number, because "night vision range" is almost always measured to the Detect criterion (something is there) — and under the EN 62676-4 DORI standard, Identifying a face requires roughly 10x the pixel density of Detection. "Detects at 100 feet" and "identifies at 100 feet" are entirely different claims, and spec sheets almost never say which one they measured.
The one thing to know: An advertised IR range (e.g. '100 ft night vision') is almost always measured to the criterion of 'barely detectable' — you can tell something moved — not 'identifiable,' where you can make out a face. Manufacturers rarely state which criterion they used, so two cameras both claiming '100 ft' can have wildly different real-world usefulness for actually recognizing who is in frame. Under the EN 62676-4 DORI standard, Identification requires roughly 10x the pixel density of Detection at the same distance — so 'detect at 100 ft' does not remotely imply 'identify at 100 ft.'
The four DORI distances hiding in one number
The professional CCTV standard IEC/EN 62676-4 defines four escalating tasks, each with a minimum pixel density on the subject: Detect (~25 px/m), Observe (~62.5 px/m), Recognise (~125 px/m), and Identify (~250 px/m). Consumer marketing collapses all four into one range-in-feet figure without saying which task it refers to. Our DORI Pixel-Density Decoder works the actual calculation, and Can My Camera Identify a Face at Night? applies it to the question most buyers really mean.
What actually extends real night range
- Light gathering: sensor size and aperture (f-stop) — the specs that predict low-light performance and that most consumer cameras leave undisclosed. The few models that publish them (Reolink's Argus 4 Pro discloses both a 1/1.8" sensor and f/1.6 aperture) let you compare on evidence instead of marketing.
- Resolution for the distance you care about: more pixels on target raises pixel density, which moves the DORI needle — but only alongside adequate light.
- Scene, not just distance: IR range is scene-dependent — dark, non-reflective surroundings absorb IR that a light wall would return. Shooting through glass typically bounces the illuminator back into the lens entirely.
See 4K color-night-vision cameras on Amazon
This page explains how night-vision range claims work in general; it is not a performance claim about any specific product.
Frequently Asked Questions
Far less than the advertised number for anything useful. An advertised night-vision range (like '100 ft') is almost always measured to the Detect criterion — something is visibly present — not Identify, where you can make out a face. Under the EN 62676-4 DORI standard, Identification requires roughly 10x the pixel density of Detection, so a camera that detects at 100 feet identifies at a small fraction of that distance.
Because the advertised range is unstandardized: manufacturers rarely state which criterion (detect vs. identify) they measured to, and real IR performance depends on sensor size, aperture, and minimum illumination in lux — specs most consumer cameras don't publish. Scene reflectivity matters too: a dark, non-reflective backyard absorbs far more IR than a light-colored wall or driveway.
Not by itself. Megapixels raise pixel density on a target, which helps the DORI math, but night reach is decided by light gathering — sensor size, aperture, and illumination. A high-megapixel camera with a small sensor and undisclosed aperture can produce worse night footage than a lower-resolution camera with better optics.
No — usually the opposite. Color night vision works only within the throw of an added visible light source (a built-in spotlight, floodlight, or porch light). Beyond that light's reach the camera falls back to monochrome infrared, whose own range limits then apply.