- Filter with a neutral colour for specific reduction of the amount of light ,- 4x exposure correction = 2 f-numbers ,- Grey x 4 D 0.60 ,- Neutral colour ,- With a front thread for an additional filter, a lens cap or a lens hood ,- HTMC coating: four layers on each side, for very good spectral transparency ,- Quality standard (glass): high-quality lens glass , ,Impact on the pictures: ,- Allows large apertures e.g. when shooting portraits when it is extremely bright: due to a blurred background the photographed person is clearly visible in the foreground ,- Due to long exposure times flowing water gets soft - Front Thread: Yes ,- Coating: HTMC (8 x) ,- Filter Thread: 43 mm ,- Metal Mount: Black ,- Mount Thickness: 5 mm ,- Type of Glass: High-Grade Lens Glass 2 years legal warranty only