The Challenge of Aerial Exposure

Ground-based photography allows continuous adjustment of settings as conditions change. In aerial work, settings must largely be configured before takeoff, with limited adjustment available through drone control software during flight. The camera is also subject to platform movement — even with gimbal stabilisation, the aircraft introduces vibration and translational motion that affect sharpness.

The typical aerial photography drone carries a small sensor in the 1/2.3-inch to 1-inch range, with some higher-end platforms mounting Micro Four Thirds or larger sensors. Sensor size directly affects dynamic range and high-ISO performance, which in turn determines how much flexibility you have in exposure decisions.

Shutter Speed: The Most Critical Variable

For aerial landscape work, shutter speed is the setting that most directly determines whether imagery is sharp or motion-blurred. Two sources of motion affect the frame:

  • Aircraft translation: The drone moves horizontally as it flies or holds position in wind. Even at a stationary hover, GPS drift and wind correction introduce small movements.
  • Platform vibration: Motor vibration passes through the airframe and, to a reduced degree, through the gimbal.

A widely applied starting point is to set shutter speed to at least double the focal length equivalent — the same principle used in handheld photography. For a drone camera with an equivalent focal length of 24mm, this suggests a minimum of 1/50s, though in practice most aerial photographers use faster speeds to compensate for aircraft motion. Values in the range of 1/200s to 1/500s are common for forward-flight shots in good light.

For mapping and photogrammetry work: Shutter speed requirements are more strict because motion blur in overlapping frames degrades the reconstruction model. A general reference used in photogrammetry is to keep image blur below 1–2 pixels. At typical drone speeds and GSD (ground sample distance) values, this often means shutter speeds of 1/500s or faster are necessary.

ISO: Balancing Sensitivity and Noise

Aerial photography in Canada is frequently conducted under variable light conditions — overcast skies, mixed sun and cloud, the strong low-angle light of early morning or late afternoon, and the flat blue light of high-altitude environments. These conditions may push exposure toward higher ISO values when a fast shutter speed is required.

Smaller drone sensors accumulate noise at ISO values that a full-frame camera would handle cleanly. Common ISO working ranges by sensor size:

Sensor Size Usable ISO Range Notes
1/2.3 inch ISO 100–400 Noise becomes significant above ISO 400
1/1.7 inch ISO 100–800 Some latitude above 400 in favourable light
1 inch ISO 100–1600 More useful dynamic range and shadow recovery
Micro Four Thirds ISO 100–3200 Comparable to compact mirrorless performance

For landscape photography where fine detail in terrain, vegetation, and water is important, staying at or below ISO 400 on smaller sensors preserves the most usable resolution. When light conditions require compromise, applying noise reduction in post-processing is preferable to significantly underexposing at low ISO.

Aperture: Fixed vs. Variable

Most small drone cameras use a fixed aperture lens. The aperture is permanently set at a value chosen by the manufacturer to maximise sharpness across the frame — typically between f/2.8 and f/4. Understanding this is important because, unlike in ground-based work, aperture is not a variable the pilot can adjust mid-flight.

Drone platforms that do allow variable aperture (generally those with larger sensors and interchangeable or adjustable lenses) require the same consideration as any other camera: stopping down from maximum aperture often improves edge sharpness and reduces vignetting, but diffraction becomes a factor at very small apertures (f/8 and beyond on small sensors).

For landscape mapping where an even depth of field across the entire frame is required — as is the case in photogrammetry — the fixed aperture common to most drone cameras is actually well-suited, as it removes one variable from the exposure equation.

White Balance

White balance choices for aerial landscape work in Canadian environments vary significantly by location and season:

  • Open sky and snow: Northern landscapes, alpine environments, and winter conditions reflect a strong blue cast. Daylight (5600K) or slightly warmer (6000–6500K) manual settings can compensate for the blue channel bias in these scenes.
  • Dense forest canopy: Green-reflected light from dense coniferous forests in British Columbia, Ontario, or Quebec may shift the scene toward green-magenta. Auto white balance handles this reasonably in JPEG capture but can cause frame-to-frame variation in mapping sequences.
  • Golden hour: Early morning and late afternoon sun in Canada's lower latitudes produces warm-toned light. A manual daylight setting (5600K) reproduces this accurately without the cooling that auto white balance sometimes applies.

For mapping projects where colour consistency across frames is important, a fixed manual white balance is strongly preferred over auto white balance. AWB introduces variation between frames that creates visible seams and colour inconsistencies in orthomosaics.

Shooting in RAW vs. JPEG

Where the platform supports it, RAW capture preserves the full sensor output and allows post-processing adjustments to exposure, white balance, highlights, and shadows without quality loss. For landscape photography — where the goal is often a final edited image — RAW provides meaningful latitude.

For mapping operations using photogrammetry software, JPEG capture is generally acceptable and reduces storage requirements. Most photogrammetry workflows do not require the extended dynamic range that RAW provides, and the consistent compression of JPEG does not significantly affect point cloud or mesh quality in typical outdoor conditions.

Polarising Filters for Aerial Work

Circular polarising filters (CPLs) can be mounted on drone cameras with a standard filter thread. At altitude, the effects are similar to ground-based photography: reduction in glare from water surfaces, improved colour saturation in vegetation, and reduced haze. The effect varies with sun angle — a CPL is most effective when the sun is at approximately 90 degrees to the shooting direction.

The added weight of a filter must be checked against the drone's payload capacity. CPLs also reduce the amount of light reaching the sensor, which may require compensating with ISO or slower shutter speeds. In high-contrast conditions — such as direct sun over reflective water — the trade-off is often worthwhile.

ND Filters

Neutral density (ND) filters are widely used in aerial videography to control shutter speed according to the 180-degree shutter rule. For still landscape photography, their use is less common but relevant when very slow shutter speeds are desired — for motion-blur effects on water, for example — or when strong light conditions would otherwise force compromise between aperture (on fixed-aperture cameras, this means ISO) and the desired shutter speed.

ND filter kits for common drone cameras typically include ND4, ND8, ND16, and ND64 densities. Graduated ND filters are not practical on most drone gimbals due to the changing horizon angle during flight.

Pre-Flight Camera Configuration Checklist

  • Set shutter speed appropriate for conditions (typically 1/200s–1/500s for landscapes)
  • Confirm ISO is at base or near-base value before takeoff
  • Set white balance manually if shooting a mapping sequence
  • Verify RAW or JPEG as appropriate for the mission type
  • Check that storage card has sufficient capacity for the planned route
  • Confirm gimbal pitch angle is set for the intended shot type (nadir for mapping, angled for landscape)
  • Verify that EV compensation is at zero unless a specific deviation is intended