The PROND100 has a 6 2/3-stop light reduction equal to a ND optical density of approx. 2.1.The ACCU-ND technology in the Hoya PROND filters yields a truly neutral color balance that will not add any noticeable color-cast to your images. The Hoya PROND series is aimed at the still photography and HDSLR video markets. The series provides 9 filters from two stop to 10 stop light reduction.The Metalli...

The PROND4 has a 2-stop light reduction equal to a ND optical density of 0.6.The ACCU-ND technology in the Hoya PROND filters yields a truly neutral color balance that will not add any noticeable color-cast to your images. The Hoya PROND series is aimed at the still photography and HDSLR video markets. The series provides 9 filters from two stop to 10 stop light reduction.The Metallic ACCU-ND coat...

Questo tipo di filtro (avvitabile all'obiettivo) non comporta alcuna modifica al colore delle nostre immagini: il suo scopo e' soltanto ridurre la quantità' di luce che arriva alla pellicola o al sensore. Vanno impiegati quando c'è' bisogno di allungare i tempi di posa: per esempio perché' vogliamo sfocare decisamente lo sfondo e quindi siamo costretti a tenere il diaframma mo...