Percentage Area Affected – Dust Analysis

The Percentage Area Affected chart shows the area affected by high-confidence dust spots across the whole sensor.

Key:

• Red diamond: percentage of the sensor covered by dust

Basic Interpretation

The Percentage Area Affected chart shows the area affected by high-confidence dust spots across the whole sensor.

Typically, this value will be very low - usually lower than 0.05% of the sensor - even at its peak.

The peak of this value is usually a little before the lens is fully stopped down. At this point, the dust spots are clear enough to be dark and invasive, but not at their sharpest (which occurs at the narrowest aperture) and therefore affect a larger area of the sensor.