Quote Originally Posted by tkamiya View Post
Seems to me, comparing your meter with a known-accurate meter is the first order of business. Otherwise, you have way too many variables to sort through. Would it be possible for you to do that with a friend or at a friendly local store? Especially with a second-hand equipment, anything is possible.

By the way, back of MY palm is exactly 18%... wooohooo!
Different meters use different parameters, and acceptance angles for measuring the light, I have five light meters and if I compare the readings of them on a Kodak grey card they vary by up to a full stop but each individual meter give me correct exposure when I use it, it's a case of a man with a watch knows the time, if he has several he's not sure.