You are increasing the concentration of light on a given surface, making it brighter. Think of when you’re using a magnifying glass to focus the rays of the sun and start burning a sheet of paper. So how the heck can you get a brighter image by adding glass between your lens and your sensor ? Well the principle is actually very simple. Most speedboosters are made with 5 to 6 pieces of glass which altogether transform a big image into a smaller image that is : And finally we’re going to see which type of lens you should use with each speedbooster.Ī speedbooster is a powerful adapter that allows you to reduce the size of an image created by a lens.Ī typical use-case is when you already own Canon lenses which are designed to produce big images for big sensors like DSLRs, and you want to reduce the size of the image in order to fit a smaller sensor such as a Micro Four Thirds sensor on the GH5 or the Pocket 4K.
Today we’re going to talk speedboosters, also called focal reducers and how they affect the image quality of a shot. First we’re going to see how a speedbooster works, then we’re going compare images shot using a Speed Booster Ultra 0.71x from the well-known Metabones brand with the lower end Viltrox EF-M2, how the two of them stack up.
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