Hi i recently bought a leica R4 and would like to know how to recognize when there's proper exposure,i can see the meter light up on the right but other than the bottom triangle and top triangle which i'm guessing means it's under or over exposed? I'm used to seeing a needle that hovers around the middle on digital or other film cameras..but the r4 just has circle or square lights and to the left of that the shutter speed numbers.Any help would be appreciated thanks 😊