This Sony FDA-EP21 Eyepiece Cup is a spare or replacement part for an included eyepiece with the a1 II mirrorless camera. Made from silicone rubber and polycarbonate, the FDA-EP21 is a deep-type cup designed to protect your viewfinder from dirt, dust, and other debris while also helping to block unwanted light.
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Turns out I had one for Sony A1 ii and when I tested this eye cup vs. the one that came with A9 iii I quickly purchased this item. Much improved, not expensive, and unlike when this item first came out, it is in stock!
My first time being a B&H customer. Very happy with an eye piece with a quick and professional service as well. B&H is Great!