What does 0.3, 0.6 etc. mean?
When referring to Neutral Density (ND) filters, the density of the filter is measured in optical absorbance. 0.3abs is 50% transmission ( 1 stop ) 0.6 is 25% ( 2 stops ).
When referring to Neutral Density (ND) filters, the density of the filter is measured in optical absorbance. 0.3abs is 50% transmission ( 1 stop ) 0.6 is 25% ( 2 stops ).