For the wide aperture lovers, the way to get an f/0.9-35mm lens for $350 has been here for a while (see video at the end of the post). However, did you know why using a 50mm, f/1.2 lens with a speed booster actually gives you an f/0.9, 35mm lens? There is quite a bit of math involved but Jimmi Kai manages to squeeze a pretty understandable version of it into a nine minutes video. (Along with some other great tips and physics nuggets)
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