What on-camera flash is
On-camera flash means a flash that sits on or in your camera and fires from roughly the same position as the lens. That covers the small built-in pop-up flash found on many cameras, and an external flash unit (often called a speedlight) mounted in the hot shoe on top of the camera.
The two are quite different in practice. A built-in flash is fixed in one direction, sits close to the lens and has limited power. An external unit is usually more powerful and has a head that tilts and swivels, so you can point it somewhere other than at the subject. Modes include TTL, where the camera and flash work out the output automatically, and manual, where you choose the power yourself.
When on-camera flash works well
On-camera flash is convenient, quick and portable, and it works best in situations where you need to react fast or cannot set up lights:
- Events and parties, where subjects move around and you do not have time to place lights.
- Fill light outdoors, to lighten shadows on faces in bright midday sun.
- Backlit subjects, where the person is in front of a bright window or sky.
- Dark rooms, where the alternative is a slow shutter speed or very high ISO.
- Deliberate direct-flash looks, where the punchy, snapshot feel is part of the style.
When it works less well
Direct flash from the camera position tends to produce flat light, because the light comes from the same angle as the lens and there are few shadows to show shape. It can also cause hard shadows right behind the subject, shiny skin, and red-eye when the flash is close to the lens axis. If you want sculpted light, consider moving the flash off the camera. Our guide to off-camera flash for weddings shows what that looks like in practice.
Getting better light from an on-camera flash
Bounce the flash
If your flash head tilts, point it at a white or neutral ceiling or wall rather than at the subject. The light spreads across a larger surface, so it looks softer and more natural. Tips:
- Bounce works best when the surface is fairly close and light in colour. A high ceiling absorbs a lot of the light and may need more power.
- Coloured surfaces can add a colour cast.
- Bouncing off a ceiling can put shadows in eye sockets. Angling the head slightly toward the subject, or using a small card on the flash, can help.
- If you are shooting a portrait in landscape orientation, make sure the head still points at your bounce surface when you turn the camera to portrait orientation.
Use direct flash on purpose
Direct flash is not always wrong. It gives a hard, high-contrast look that some photographers use for fashion, street or documentary work. Keep the subject a sensible distance away and watch for harsh shadows on the wall behind.
Add a diffuser
A small diffuser or bounce card softens the light a little, though the effect is modest compared with bouncing off a large surface.
Move away from the lens
Some flashes can sit on a bracket that raises them above the lens. That reduces red-eye and changes shadow position slightly, though it still does not match true off-camera lighting.
Settings to start with
For a more detailed look, see our article on flash camera settings. As a starting point:
- Shutter speed: keep it at or below your camera’s flash sync speed. This is commonly around 1/200 to 1/250 second, but it varies by camera, so check your manual. Faster speeds need high-speed sync, which many modern flashes support.
- Aperture and ISO: use these to control background brightness and the distance range of the flash.
- Mode: TTL is a practical default when conditions keep changing. Manual gives consistent results once you have a setup you like.
- Flash exposure compensation: reduce it if the subject looks too bright, raise it if the subject looks dark.
Balancing flash with the background
Photographers often want the subject lit by flash and the background left visible. In general, aperture and ISO affect both flash and ambient light, while shutter speed mainly affects the ambient light. So a slower shutter speed (within what you can hold steady) brings up the background without changing the flash exposure much. This is often called dragging the shutter or slow-sync flash. The overview of flash in photography explains the wider idea.
On-camera flash on a phone
Phones have a small LED light rather than a true flash on most models. The camera app usually lets you choose on, off or auto, and some apps offer a night or low-light mode that can give better results without any added light. For people, soft light from a lamp or window is often kinder than the phone’s built-in LED. The exact options depend on your device and app.
Common mistakes
- Pointing the flash straight at a close subject at high power.
- Shooting faster than the sync speed without high-speed sync.
- Bouncing off a ceiling that is too high, dark or coloured.
- Forgetting that the flash will not light a distant background.
- Leaving the flash on auto and being surprised when it fires in a place where it is not allowed.
FAQ
When should I use the flash on a camera?
Use it when light is low, shadows on faces are strong, or the background is much brighter than the subject. Avoid it when the available light already looks good or flash is prohibited.
What is the difference between built-in and external flash?
A built-in flash is small, fixed and convenient. An external flash is usually more powerful and can be aimed, bounced and modified.
Are flashbulbs still made?
Flashbulbs have largely been replaced by electronic flash, though some specialist or collector items may still exist. Availability varies, so check current suppliers if you need one.
What is flash light photography?
It is photography that uses a brief burst of artificial light to light a scene or fill shadows.