This may sound pretty simple but I need to ask. I have a Canon Zoom Lens FD. Above the aperture ring there are two vertical lines side by side. One is greeen the other is a pale red. Which one should I have lined up with the desired aperture? Any help is appreciated. Thanks In the picture below you can see an "A" with a green and red line above it. That "A" is for auto. If I take it out of Auto and adjust the aperture manually I am unsure whether to line up the desired aperture with the green or the red line. It stops at both lines, so its hard to know what aperture your actually set at.