Camera Accessories
Cokin Z121M Neutral Grey Gradual ND4 Filter
The Cokin Z121M has a progressive graduation from the middle to the top of the filter, with the same colour as the 121 filter, but with a lower tone.
https://www.bizrate.co.uk/cameraaccessories/cokin-z121m-neutral-grey-gradual-oid24206391262.html
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