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The 1.4x Full Frame Expander is designed to make Super35 format PL lenses compatible with full-frame sensors. Venus Optics says the 1.4x adapter will reduce light by one stop and increase the focal length of the attached lens by 1.4x. Venus Optics has also added a back-focus-adjustment to the adapter so those changes can be made on-the-fly without the need to shims.
PL-PL Mount