Ak by niekoho zaujimal variadilny ND filter pre dlhsi objektiv, tak K&F Concept B-Series Variable ND2-400 sa oblukom vyhnite - galeria 9 fotiek s filtrom a bez neho, bez podrobneho skumania, nemalo to zmysel (funguje len na sirsom objektive):
https://1drv.ms/f/s!ArKU9lBMqxbMn9EyQR7y7_AVN90SuA...