If you are metering with a handheld meter, and setting tha camera with that reading, it will not matter what the ISO setting on the camera is, as you will not be using the meter in the camera. If you are using a handheld meter, set that meter at ISO 125 and use those readings. If you are using the meter in the camera, and it is a TTL meter, simply screw the filter on and continue using the 160 setting on the camera's ISO dial. Why are you using two meters and two settings?
Originally Posted by kbrede
What camera are you using?