So instead of going out to buy a camera just yet, my girlfriend handed me her camera and told me to play around with it since she's too busy with school to use it. I understand how to use the light meter to get the right combination of aperture and shutter speed and can focus well enough, but I'd like to understand more about the camera. I don't have access to the manual, so I was hoping that the good folks of OT can help me understand the camera. Here's a picture of it. It's a Pentax ZX-M with a 50mm 1:2 lens. So... Starting with the lens. I know that the bottom row of numbers is the aperture, and I line that up with the red diamond on the second row (correct?). I have no idea what the second row of numbers means (anyone know?) The third row of numbers is the focal length (distance to object?) Is this the correct term? The dial on the left is for the ISO. I see that it has a 0, +- 1, 2, and 3. I'm guessing that the camera reads the ISO from the film cartridge, and you would normally keep it at 0. What do the steps up and down do? The dial on the right is shutter speed, and I would assume are listed as 1/printed speed. I'm guessing that 2S is two seconds, but what would B,100,and A mean? A is probably automatic, where the camera chooses based on the aperture you've set?