4
TakeatestshotAn ND filter of 15 stops is
needed for this shot. As this is too dark to
meter through take a test shot without a filter
and use the exposure settings to calculate the
filtered exposure.5
CalculatethefilteredexposureYou need to
double the exposure time for each stop
of neutral density – in this case, fifteen times.
If the maths is bit daunting, there are phone
apps which will do the calculation for you.6
TakethefinalshotFitthefilter;makesure
it’s in the rearslot,withtherubbergasket
facing the camera,fittedtopreventlightleaks
and thus flare. SetBulbmodeandlockthe
shutter open for thecalculatedexposure.AFTer
With polariser
& ND filter
The addition of a polariser has
removed the glare from the
water; an ND has lengthened
the exposure, giving the white
water a creamy texture