I got this camera as a gift and am fairly new to SLR, though I've been interested in photography for quite some time.

In the manual it says that the lever in the view finder has to be in the circle. Sometimes I can get in the circle, others times I have to leave it just under or it will go so high up I risk overexposure.

Am I doing this right? Or is there something I should know? I would to figure this out because the book I bought requires to know the correct exposure before playing around with it.

Thank you