The Haida Red Diamond 17 Stop ND 5.0 Filter is an invaluable tool for photographers specializing in daytime long exposure photography.

Shooting long exposures in broad daylight can be very challenging, and the Haida Red Diamond 17 Stop ND 5.0 Filter was created with this in mind. Most conventional ND’s simply don’t provide enough light reduction. 
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https://www.thephoblographer.com/2020/12/07/long-exposures-made-easy-haida-17-stop-nd-5-0-filter-review/