Compatible with Meike EFTR adapters, this Variable ND3-ND500 Rear Drop-In Filter for EFTR Series Adapters from Meike allows you to adjust the amount of neutral density without having to swap filters. The separately available EFTR adapter accepts this filter assembly, allowing you to do ND exposure pulls via the integrated thumbwheel, which is significant as you can adjust exposure on the fly without changing the depth of field.
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