Angular Resolution
Angular resolution is a system's ability to distinguish fine spatial detail at a given range. It drops sharply with distance, meaning distant objects may appear as just a handful of pixels.
Angular resolution is the ability of an imaging system, such as a camera or telescope, to distinguish fine spatial detail at a given range. It quantifies the smallest angular separation between two objects that can be resolved as distinct, independent of total pixel count. This property depends on the system's optics and is critical for determining clarity in distant observations.
What this means in real life
A telescope with poor angular resolution might see two nearby stars as a single blurry dot, while a better telescope separates them into two distinct points of light—the difference is angular resolution.
What it isn’t
It is not the same as magnification or zoom. A telescope can magnify an image without improving angular resolution; if two stars are unresolvable, magnifying them just makes a bigger blur.
Commonly misused online
People often conflate angular resolution with image sharpness or pixel count. A high-megapixel camera doesn't automatically have better angular resolution—the lens optics and atmospheric seeing matter far more.