The ProOptic 4X4 (100mm) Filter Holder Foundation kit is on sale for $40 with free shipping at Adorama, but that’s not all. When you click on the “See details” of the yellow “Special Offer”, you can select a free ProOptic Adapter ring at the size of your choice (52, 55, 58, 62, 67, 72, 77mm). The 82mm is +$1 instead of free. Here’s an annotated screenshot crop of that:
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