Calibrating my flash meter

Anne wrote:

I’ve been using a Polaris flash meter in the studio. I’m having problems getting the correct exposure. It seems to be about two f-stops under exposed. I have both my camera and meter set for ISO 80, shutter speed 1/60, and it is giving me a 5.6 f-stop reading which is way underexposed. I have to open my camera up two f-stops and then that over exposes it a little.

I’m photographing clothes, so i need to show details as in pockets, zippers, stitching and so forth. I know meters are just a starting point but this seems way off. Could you explain why this is happening?

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