According to SonyERumors, Tamron’s upcoming three prime FE lenses could be all f/2.8 lenses. SonyERumors has found that Tamron has registered three new lens patent are all f/2.8 prime lenses:
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It seems that Sigma has just filed a new lens patent in Japan. This lens is Sigma 12mm f/2.8 lens, for full frame cameras. This could be widest Sigma Art prime lens for Sony full frame mirrorless cameras.