ZERO camera filter ND4 Ultra Soft
Material specifications: 100% high quality optical resinOptical properties: 0.6, 0.9, 1.2 optical density, 25% - 6,25% of light transmittance in the top part, 1F - 4F stops light reductionOptical density tolerance: +/- 1%Available dimensions:75x90mm, 84x100mm, 100x150mm, 150x170mmVISIBLE LIGHT SPECTRUMLIGH TRANSMITTANCE ULTRA SOFT GRADUAL ND filters have various density throughout filter space (from dark to light with ultra soft transition). It means that light incoming to camera is reducing gradually. This is very useful in situations where some of parts of the photography are overexposed (too much bright sky). ULTRA SOFT GRADUAL ND filters are able to use with full or gradual filters in stacking mode.