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What size prism filter for my Sigma 85mm 1.4 lens?
What size prism filter for my Sigma 85mm 1.4 lens? I'm looking to buy a cheap prism lens off of Amazon to use on my Sony A7III with Sigma Art 85mm lens. The prisms I'm looking at come in 72mm, 77mm and 82mm sizes but I'm assuming that's the size itself? Does anyone know what size prism I'd need for this lens? I'm possibly being thick...But I can't see the specs for it on the Sigma website.
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