So i just bought an f90x nikon slr and thought it was working great until i realized something. When in Av or program mode, whenever i turn my aperture ring from say f1.4 to f16, the meter will read properly the correct shutter speed. However, when i turn the aperture ring the other way, the meter seems to be locked in f16 or whatever was last set before turning the ring the other way. Right now i have to use M mode and use a handheld lightmeter. Works fine in M mode from what i can see. Any help would be greatly appreciated!!