For example, the Speedlite EL-100 has a guide number of 26 (ISO 100, metres), so if the subject is 6.5 metres away, you need to use an aperture of f/4 (=26/6.5) at ISO 100.
It's just a case of dividing the guide number by the subject distance (in metres) to find the aperture needed for the exposure. You'll find a Speedlite's guide number listed at the top of its specification sheet and, once you know it, you can use the calculation above in reverse to calculate the correct exposure setting. To ensure good results, you need to know the sensitivity (ISO) setting used, and the distance must be measured in metres, so guide numbers are usually written as "60 (ISO 100, metres)". So if good results are produced by using f/8 for a subject 7.5 metres away, the guide number is 60 (8x7.5). Greater flash power means you can illuminate more distant objects.Ī flash's guide number is calculated by multiplying the flash-to-subject distance by the aperture required for a well-exposed photograph. The higher the number, the more powerful the flash. The guide number of a flash is an indication of its power. So here's a guide to the most important Speedlite basics. And for macro photography, there's the Macro Ring Lite MR-14EX II and Macro Twin Lite MT-26EX-RT, which help you get light onto very close subjects.Īll Speedlites have a collection of Canon technologies to help you get the best possible results, and it's useful to understand a bit about them to ensure that you select the right Speedlite and get the best from it. For example, the Speedlite EL-1 is very powerful and well-suited for use on pro cameras such as the Canon EOS 5D Mark IV or full-frame mirrorless EOS R5, whereas the Speedlite EL-100 is very compact and more at home on a smaller camera like the EOS 250D or compact mirrorless EOS M6 Mark II.
They're useful in low-light conditions but they can also transform images in bright sunny conditions by filling in shadows and helping to balance the exposure across the scene.Ĭanon has a range of Speedlites to suit different cameras, photographers and shooting situations. Speedlite camera flash units enable you to add extra light to a scene and take control of how your subject is illuminated.
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