Dtjytyk

I'm having trouble getting nice even lighting when using my speedlight on my camera. I photographed a formal recently in a hall with high yellowish ceilings. I pointed the speedlight directly upwards at the ceiling to diffuse the light. However in many of my photos, especially those near walls, the light would be very bright near the top and dim near the bottom. What could I do to avoid this?

You need to think about the direction of the light when you bounce.

Bouncing isn't just about pointing the flash up, or up and forward. It's about picking the direction of your light. If you're bouncing, you have to stop thinking of the flash as your light source, and think of the reflecting surface your flash is pointed at as your light source. In other words, point the head of the flash at where you'd put a softbox in a studio. In this specific case, you put the light in the ceiling, straight over your head, more or less pointing downwards.

If you want the light to come from the front more, you need to bounce behind you. But there may not be a reflective surface (wall) there. So, choosing where in the room you do this, and how the room is shaped / how far away the walls/ceiling are all key. The higher the ceiling, the less liable you'll be able to bounce, because light, like all forms of electromagnetic energy, falls off according to inverse square. (1/x²). Double the distance, you quarter the light; triple it, and you've down to one-ninth. There are reasons to still use a high ISO setting, even if you use a flash.

You may need to set up a reflector or reflective surface, or rearrange where the group is standing, so you can use a bounce surface. Or. Consider taking that flash off camera, and remotely triggering it somehow (most commonly, with a radio transmitter/receiver).

See also: Neil van Nierkerk's Tangents website. He's got a ton of information on bouncing an on-camera flash.

In addition to what xiota suggests, you need to consider how the inverse square law applies here (What is the inverse-square law, and how does it apply to lighting for photography?).

If you were forced to only bounce the light off the ceiling, then to even out the exposure from top to bottom, you'd need to increase the total distance the light has to travel so that the difference between light path to top and light path to bottom are ratios that are closer together. This is often hard to control, as you can't adjust the ceiling height and often have little working room for which to move back - and the solution of decoupling the flash from the camera to move it further behind you, for example, actually opens the door to better lighting methods.

If you can get the flash off the camera - this would be the most ideal as you have more control over where the strobe sits relative to the subject and any sort of modifiers you want to use to soften the light.

If you cannot decouple the flash from the camera, then your next best option is to direct some of the light forward so that it can fill in where the main light path has started to fall-off. This is done by extending the bounce card up (if your flash has one), adding a home-made bounce card, or using a light modifier that throws the light in all directions (something like a Magmod of Fonger)

In addition to the light falloff across the frame, there are some light-dark bands, possibly caused by flickering artificial lights?

Options to consider:

• Reduce shutter speed or use sync settings on camera to eliminate banding.




• Use diffuser in addition to bouce.



• Use the bounce card on your flash.


• Change the angle of bounce. (See inkista's answer.)


• Try bouncing off nearby walls.


• Bounce off a reflector, held by assistant or stand.


• Umbrellas and soft boxes?


• Off camera flash (See Hueco's answer.)

The problem should be fairly easy to fix with post processing.

• Create layer with black to white gradient matching the change in light levels. You can even grab, expand, blur, invert, and desaturate a section of the wall. Using a portion of the wall will help reduce the appearance of the bands. You will need to clone out the logos.


• Find an appropriate layer blending mode. (I used overlay.)


• Change opacity to taste. (I used 35%.)


• Touch up with dodge and burn. (I skipped this, so banding is still visible.)

There are more complicated methods, but the basic idea of using layer blending modes is the same.