'Bright day' implies the ND filter is in which means that if the ND filter were out the required shutter speed would be about 1/12,800 sec (on most cameras).
I believe the ND filter is usually 2 or 3 stops (2.86 stops on my cam, for instance), which makes it 1/6400 sec at most.
No, that is two stops, or a factor of 4x.Three stops is a factor of 8x or 1/12,800 sec.
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Creative Uses of CHDK
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General Help and Assistance on using CHDK stable releases
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Hello, I'm a NEWBIE - HELP!! (Newbies assistance, User Guides and thank you notes)