The aperature of my camera does not open up as I change the aperature settings on the camera. What do I need to do? (Sorry for the newbie question.) I am using an old camera, a Nikon D100. I have type D lenses. The instructions for attaching lenses to the camera say that I need to lock the aperature of the lens at the minimum setting (highest f-stop number). When I try to set a wider aperature using the camera settings, the camera display says I am working with a smaller f-stop number, but I still can barely see out out the viewfinder. If I set a wider aperature using the lens aperature ring, it looks great through the viewfinder, but then the camera does not let me take pictures. It works the same with different types of lenses (e.g., a Nikon AF NIKKOR 20-35mm lens, and a Nikon AF Micro 60 mm lens). Can someone explain what is happening here? Shouldn't the lens open up as I change the aperature setting using the camera controls? How can I get it to do that? I wonder if 1) the camera is broken or 2) there is some obscure setting I need to change. Thanks.