Originally posted by rmtagg Just fantastic shots. Now I have to ask, what are these ND, ND8=ND4=CPL?????
as per wikipedia :
Neutral density filter - Wikipedia, the free encyclopedia
In photography and optics, a neutral density filter or ND filter is a "grey" filter. An ideal neutral density filter reduces light of all wavelengths or colors equally. The purpose of standard photographic neutral density filters is to allow the photographer greater flexibility to change the aperture or exposure time, allowing for more control, particularly in extreme circumstances.
For an ND filter with optical density d the amount of optical power transmitted through the filter is given by:
Fractional Transmittance = 10-d
-> ND8 = 3 stops
ND4 = 2 stop
CPL = 1 stop
if you combine ND8 + ND4 + CPL = ND13 : 6 stops
I used this ND Filters to reduce light passing the lens and also to avoid harsh light and make a slow shutter sometimes.
Hope this helps, correct me if I'm wrong guys.
Thanks,
Abet