the filter shown has a number of white marking on the edge - does the info that came with the filter give any idea of what the "ND #" would be at each setting or is it just a rotate the ring till the exposure says OK ? or ????
The only thing I could see was the least amount of light was indicated by the smallest white mark and the most by the largest. The one I received the outer glass was loose because the bezel was not tightened properly. I tightened the bezel but the glass was not aligned so I have to resort to attest fire and see procedure with this item. Understand, however, I have never been disappointed with the resulting photos, just the construction of the product.