To do this, you can use either a Canon Off-Camera Shoe Cord OC-E3, which fits into your camera's hot-shoe and connects your flash with a cable, or the Canon wireless flash system, which has greater range and greater versatility, with the option to use multiple flash units. The range and the number of flash units depend on which control system you use. If your Speedlites support the Canon Radio Transmission (RT) wireless sytem, the range is up to around 30 metres, and you can use up to five groups of remote flash units, with up to three flash guns in each group. The Canon optical wireless system can control two or three groups but with any number of flash guns in each group, and it has a smaller range of up to around 15 metres indoors, but this will be ample for a studio set-up. As at the end of 2020, all current Speedlites will work with the optical wireless system (although a couple of macro ring light models work only as transmitters, not as remote receivers).
The Canon wireless flash system is not only convenient and versatile, but also very portable. This means you can set up a studio in almost any suitable space.
The Speedlite range are powerful for their size – the flagship Speedlite EL-1, for example, has a guide number of 60 (metres, ISO 100) but weighs less than 690g complete with its rechargeable Lithium-ion battery – and many are ideal for use with large light modifiers, such as umbrellas or big softboxes, to soften and diffuse the light when required to create truly professional results. In contrast to many artificial light sources, diffused illumination better emulates natural lighting, such as the light through a window. What's more, you don't necessarily need to invest in pro studio equipment – with just a little time and ingenuity, it's easy to make your own light modifiers and accessories to use with your Speedlites.