I recently got myself a neutral density filter and tested it. I can't help but noticed a few differences between shots with and without the filter on the same scene/lighting/time:
1) the colour balance is slightly different (expected)
2) the camera metered settings are 2-3 stops higher. e.g. shutter at 1/400 without the filter became 1/100 with the filter (expected with ND8 filter)
3) the metered outcome, however, is about 1.5 - 1.7 stop darker than the picture without the ND filter. i.e. I have to adjust the RAW image by increasing the exposure by 1.5 - 1.7 stop to achieve similar lighting (unexpected)
[used the ND8 on top of the UV filter, didn't think it'd make any difference]
My question: do you also experience wrong camera metering when using ND filters? Is it common to have to compensate for lighting when using ND filter?
thanks in advance for your advice/comments.