How to Photograph in Full Sun: Exposure, Shadows and Fill Flash

Photographing in full sun seems straightforward: there is plenty of light, so you can use a low ISO and fast shutter speeds. In practice, the challenges are strong contrast, deep shadows and lost detail in the brightest parts of the frame. However, you do not have to limit your photography to the golden hour. Harsh light also offers interesting possibilities when you deliberately choose your exposure and the direction of the light.

1. Why is full sun challenging?

On a cloudless day, the sun has a small angular size, so direct sunlight produces clearly defined shadows. The bright and shaded parts of a scene can differ so much that the camera cannot record detail in both at once.

In portraits, this shows beneath the eyes, nose and chin. With animals, light fur can be close to overexposure while the eyes and part of the face remain in shadow. The greatest challenge is therefore the contrast in the scene, rather than simply the amount of light.

2. How do I set exposure in harsh sunlight?

I start at ISO 100 and choose the aperture for the depth of field I need. I then set the shutter speed and check the brightest important areas of the frame. I shoot RAW, but remember that completely blown-out detail cannot be recovered later.

The histogram and highlight warning help. I pay particular attention to light fur, skin, white clothing and clouds. A small reflection of the sun does not always need to be preserved at the expense of the whole photograph. The camera histogram and warnings are based on the JPEG preview, so I treat them as guidance rather than an exact measurement of the RAW file’s remaining highlight headroom.

When using Av mode, I keep an eye on the shutter speed and apply exposure compensation if needed. In M mode with a fixed ISO, I adjust brightness directly through shutter speed, aperture and ISO. Exposure compensation alone will not change these manually selected settings.

3. The direction of light matters

Front lighting, with the sun behind the photographer, lights the subject from the front, but can cause squinting and reduce the sense of depth. Side lighting emphasises shape, texture and shadows — useful for portraits, architecture and animal photography.

Backlighting illuminates hair or fur and separates the subject from the background. However, a shaded face may need fill light. Before changing the camera settings, I check whether moving a few steps might produce a better result.

4. Shooting into the sun with flash

When the sun is behind the subject, exposing for the face can overexpose the background. Exposing for the bright sky often leaves the face too dark. Fill flash helps reduce this difference.

First, I set the exposure for the background

I begin with a photograph without flash. In M mode, I choose ISO, aperture and shutter speed to preserve important detail in the sky and surroundings. At this stage, the foreground may be too dark — I will brighten it with flash.

Then I add light to the subject

I switch on the flash and adjust its power manually, judging the effect on the face or fur. The aim is to lift the shadows naturally. If the flash looks too strong, I reduce its power or change its position. Its distance from the subject and the modifier used have a considerable effect on the result.

With a Canon EOS R6 Mark II and a Canon-compatible Godox V1, ISO 100, f/2.8 and a shutter speed chosen for the background can be a starting point. There is no universal flash power setting: I choose it after a test shot. In strong sunlight, low power may not be enough, particularly at longer distances or when using HSS.

What does shutter speed change, and what does flash power change?

With normal synchronisation and the entire flash pulse recorded, changing shutter speed primarily affects ambient light. Flash power and distance control the flash contribution, while aperture and ISO affect both kinds of light. In HSS, a faster shutter speed also changes the amount of flash light recorded — this simple separation no longer works in the same way.

Normal synchronisation or HSS?

The Canon EOS R6 Mark II synchronises normal flash at 1/200 s or slower with the mechanical shutter and 1/250 s or slower with the electronic first-curtain shutter. These are two different shutter modes. Faster shutter speeds require a compatible flash and HSS support, including in the trigger if the flash is used off-camera.

HSS allows flash to be used at fast shutter speeds, but reduces its effective output and range. The more demanding the conditions, the more important it becomes to keep the flash close to the subject. Do not assume that a small speedlight will illuminate a distant person as effectively as someone nearby.

An alternative: an ND filter

A neutral density filter reduces the amount of light reaching the sensor. It allows a slower shutter speed with a wide aperture while staying within normal flash sync limits. However, it also attenuates flash light, so it does not replace the need for a sufficiently powerful flash.

A calculation example: if the correct exposure without a filter is ISO 100, f/2.8 and 1/6400 s, a 5-stop ND filter allows a shutter speed of 1/200 s at the same aperture and ISO. This illustrates the relationship; these settings are not guaranteed to work on every sunny day.

5. Shooting at f/1.4 in full sun

A wide aperture helps separate the subject from the background, but requires careful control of exposure and focus. At f/1.4, ISO 100 and in a very bright scene, you may reach the camera’s fastest available shutter speed. You then need to stop down or use an ND filter; when using flash, synchronisation must also be considered.

For a close portrait, I focus on the eye. If the eyes are at different distances from the camera, a shallow depth of field may not cover both. Background blur also depends on focal length, distance to the subject and the distance between the subject and background.

6. How can I manage harsh shadows without flash?

Look for open shade, where the subject is lit by a large area of sky. A light wall or white reflector can gently brighten the shaded side. I avoid patches of light coming through leaves when they cross the face and make exposure harder to control.

A silver reflector produces a stronger, more directional reflection. It can cause squinting, so it is not always the best choice. Gentle fill from a white surface or a change of location is often enough.

7. Is it worth photographing at midday?

Yes — especially architecture, details, strong colours and scenes built around distinct shadows. In portraits, this light needs more care, but side lighting or backlighting can produce interesting results. Not every photograph needs soft light.

A practical workflow

1. Choose the direction of light and the background.
2. Set the ISO and an aperture suited to the required depth of field.
3. Choose the shutter speed, and check the histogram and highlights.
4. If using flash, choose normal synchronisation, HSS or ND.
5. Fill the shadows and assess how natural the effect looks.
6. Check focus on the eyes and detail in light skin, clothing or fur.

The key is to use the conditions deliberately. Sometimes a few steps to the side will help; at other times, a reflector or flash will. A good photograph in full sun starts with observing the light, not with one universal combination of settings.

Read also

• External flash — manual settings
• Landscape photography with maximum depth of field

Camera flash synchronisation specifications: Canon EOS R6 Mark II manual.