Help with metering for an ND filter

Started Nov 11, 2012 | Questions thread
michaeladawson Forum Pro • Posts: 10,899
Re: Help with metering for an ND filter

RP McMurphy wrote:

Apart from occasional use of a Polariser I haven't used filters previously

I imagined that being TTL metering I would attach the filter as normal and get the 'right' exposure

However I have repeatedly found (D800) that it will not give me the right exposure and I have to dial in +3 stop (ND8)

I'm a bit puzzled about this and tried my polariser (1st time since owning the D800) and that too doesn't meter properly - I have used both matrix and centre metering

Any advice? What am I missing here?

Thanks in advance

I would be puzzled too.   An 8X filter should be three stops of light.  So it is interesting that you have to dial in +3 on exposure comp.  If you are testing the filter are you sure you aren't using AE lock or something similar?  There is no way the camera knows that you have attached the filter.  With the filter attached the camera should just meter normally and should calculate the correct exposure.

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Mike Dawson

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