SIRUI T2.9 1.25X Anamorphic Adapter with 82mm Rear Thread only

The Sirui 1.25x Anamorphic Adapter enables you to convert any spherical lens into an anamorphic or increase the squeeze ratio of an existing anamorphic lens. Use it to create a 1.25x anamorphic effect with a spherical lens or a 2x squeeze with a 1.6x anamorphic lens.

eBay