it is not easy to tell how filter help us as landscape photographer … normally we face
1. either foreground correct exposure but the sky will be over or sky ok but foreground under
2. when light reach horizontal (sunset/sunrise last momet) … the center park of the light source use to over exposure with highlight blown …
and here is a simple picture show what filters I to get different results
– GND use up to the grass level
– RGND use up to the house
– meter on foreground grass
my previous share on RGND click
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Alternate filter holders option ZHolder
or contact me for more details