i thought GND might more helpful in sunset pic ?

30s daylight also might have chance to cook your sensor
why don't try make time-lapse stop-motion video?? then you can see the sun set and the cloud move and the difference waves..

if u still need the landscape in picture, maybe u need not only 1 ND filter, but stack of them.. (maybe a ND8 + GND + CPL)

oh ya. i thought long exposure with direct sunlight will ? (din mean other else, but with direct sunlight)
based on what i know (although it might be wrong)
because direct sunlight will heat up the sensor, and might melt the circuit behind it?
(same concept applied when u use a lens and focus the light below the paper, the paper get burned)

sorry for misleading..

@hako
don't worry. if wan know all.. read the manual lo.. at least have a glance of your camera feature

@mastering89
go our sifu website see http://www.glaringnotebook.com/Default.asp?id=1150

@mastering89
thats was from KL photo essay shootout , and their team get the 1st prize congrats