This style of moody, low-key lighting is normally created by placing a light modifier – commonly referred to as a gobo – in front of your flash. Gobos are available in a whole range of shapes and sizes, and can generate a variety of different patterns and shapes.
If you’ve never heard of a gobo before, then essentially this is a stencil or a template that is placed in front of a light source to modify the shape of the light. In our case we’re using a gobo to create a thin slit of light.
If you don’t have the budget to invest in a branded gobo kit, use your crafting skills and make your own. It’s incredibly simple: all you need is a small cardboard box that is large enough to fit over the front of your flashgun, a pencil, and a crafting knife or a pair of scissors.
With your pencil, trace around the flash head of your flashgun onto one end of the box, and use your crafting knife or scissors to cut out a hole so that your flashgun can slide snuggly into it. On the opposite side, make a small slit, which will narrow the band of light and create that slither of light.
Slit lighting effect in six steps
(Image credit: Tom Calton)
1. Set up your flash
Grab your flashgun, attach your wireless trigger, and secure it to a sturdy light stand. Make sure that the flash head is exposed enough so that you have plenty of room to slide on your DIY gobo
(Image credit: Tom Calton)
2. Attach the modifier
Grab your DIY gobo light modifier and slide it over the end of your flashgun. Ensure that it is a snug fit, so that all of the flash head is enclosed within the box.
(Image credit: Tom Calton)
3. Position your model
Ask your model to get into position in front of the flash. It’s important that they don’t move around too much, so it might be beneficial to ask them to sit on a chair or a stool.
(Image credit: Tom Calton)
4. Aim the flash
Unless your flash has a modelling light, you’re going to have to guess where to aim the flashgun. Do this by looking over the top of the box and lining it up with your model’s face.
(Image credit: Tom Calton)
5. Test shot
Take a quick test shot, and then review the image. You may need to adjust the position of the light until the thin slit of light is in exactly the right position on the model’s face.
(Image credit: Tom Calton)
6. Shoot and review
Once you’re happy with the position of the flash, it’s time to bag the shot. Review your shots regularly to ensure that the light is in line with the model’s face. Adjust their position again if necessary.
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